Gess, F.W. 1965. Contribution to the knowledge of the South African species of the genus Ceramius Latreille (Hymenoptera: Masaridae). Ann. S. Afr. Mus. 48(11): 219-231.

Gess, F.W. 1968. Further contribution to the knowledge of the South African species of the genus Ceramius Latreille (Hymenoptera: Masaridae). Novos Taxa ent. 57: 1‑14.

Gess, F.W. 1973. Third contribution to the knowledge of the South African species of the genus Ceramius Latreille (Hymenoptera: Masaridae). Ann. Cape Prov. Mus. (nat. Hist.) 9(7): 109‑122.

Gess, F.W. 1989. New species of the genus Celonites Latreille (Hymenoptera: Masaridae) from South Africa. Ann. Cape Prov. Mus. (nat. Hist.) 18(4): 83‑94.

Gess, F.W. 1992. A new species of the genus Celonites Latreille associated with the flowers of Wahlenbergia in southern Africa (Hymenoptera: Vespidae: Masarinae; Campanulaceae). Journal of Hymenoptera Research 1: 141‑144.

Gess, F.W. 1995. Descriptions of the male of Riekia nocatunga Richards, the male & two strikingly distrinct sympatric colour forms of Riekia confluens (Snelling) and the male of Rolandia angulata (Richards) (Hymenoptera: Vespidae: Masarinae) from Australia. Journal of Hymenoptera Research 4: 33‑40.

Gess, F.W. 1997. Contributions to the knowledge of the species of the genera Ceramius Latreille, Celonites Latreille, Jugurtia Saussure and Masarina  Richards (Hymenoptera: Vespidae: Masarinae) in southern Africa.  Journal of Hymenoptera Research 6(1): 36‑74.

Gess, F.W. 1998. Priscomasaris namibiensis Gess, a new genus and species of Masarinae (Hymenoptera: Vespidae) from Namibia, southern Africa, with a discussion of its position within the subfamily. Journal of Hymenoptera Research  7(2): 298‑306.

Gess, F.W. 2004. A revision of the Afrotropical species of the wasp genus Jugurtia de Saussure, 1854(Hymenoptera: Vespidae, Masarinae). Howard Evans Memorial Volume. Journal of the Kansas Entomological Society 77: 669-720.

Gess, F.W. 2005. Three new species of Masarina Richards, 1962 from southern Africa with a key to all species of the genus (Hymenoptera: Vespidae, Masarinae). Journal of Hymenoptera Research 14(1): 7-14.

Gess, F.W. 2007. Four new species of the wasp genus Celonites Latreille, 1802 (Hymenoptera: Vespidae: Masarinae) from south-western Africa, designation of neotype for C. michaelseni von Schulthess, 1923, species representation in Namibia, and a key to species occurring in Namibia. Journal of Hymenoptera Research 16(1): 11 – 29.

Gess, F.W. 2007. The genus Quartinia Ed. andré, 1884 (Hymenoptera: Vespidae: Masarinae) in southern Africa. Part I. Descriptions of new species with complete venation. Journal of Hymenoptera Research 16(2): 211 – 233.

Gess, F.W. 2008. The genus Quartinia Ed. andré, 1884 (Hymenoptera: Vespidae: Masarinae) in southern Africa. Part II. A new species with complete venation and with deeply excised antennal club in the male.Journal of Hymenoptera Research 17(1):  83 – 85.

Gess, F.W. 2009. The genus Quartinia Ed. andré, 1884 (Hymenoptera: Vespidae: Masarinae) in southern Africa. Part III. New and little known species with incomplete venation. Journal of Hymenoptera Research 18(2): 244 – 281.

Gess, F.W. 2011. The genus Quartinia Ed. andré, 1884 (Hymenoptera, Vespidae, Masarinae) in Southern Africa. Part IV. New and little known species with complete venation. Journal of Hymenoptera Research 21: 1–39. doi: 10.3897/JHR.21.870

Gess, F.W. 2011. The genus Quartinia Ed. andré, 1884 (Hymenoptera, Vespidae, Masarinae) in Southern Africa. Part V. New and little known species with incomplete venation. Journal of Hymenoptera Research 22: 29–43. doi: 10.3897/JHR.22.871

Gess, F.W. 2012. The genus Quartinia Ed. andre, 1884 (Hymenoptera, Vespidae, Masarinae) in Southern Africa. Part VI. New and little known species both with complete and incomplete venation. Journal of Hymenoptera Research 24: 95–115. doi: 10.3897/JHR.24.2155

Gess, F.W. & Gess, S.K. 1980. Ethological studies of Jugurtia confusa Richards, Ceramius capicola Brauns, C. linearis Klug and C. lichtensteinii (Klug) (Hymenoptera: Masaridae) in the Eastern Cape Province of South Africa. Ann. Cape Prov. Mus. (nat. Hist.) 13(6): 63‑83.

Gess, F.W. & Gess, S.K. 1980. "Mesem bread" ‑ the nesting of the wasp Ceramius lichtensteinii (Klug) (Masaridae). The Eastern Cape Naturalist 24(3): 7‑9.

Gess, F.W. & Gess, S.K. 1986. Ethological notes on Ceramius bicolor (Thunberg), C. clypeatus Richards, C. nigripennis Saussure and C. socius Turner (Hymenoptera: Masaridae) in the Western Cape Province of South Africa. Ann. Cape Prov. Mus. (nat. Hist.) 16(7): 161‑178.

Gess, F.W. & Gess, S.K. 1988. A contribution to the knowledge of the taxonomy and ethology of the genus Masarina Richards (Hymenoptera: Masaridae) Ann. Cape Prov. Mus. (nat. Hist.) 16(14): 351‑362.

Gess, F.W. & Gess, S.K. 1988. A further contribution to the knowledge of the ethology of the genus Ceramius Latreille (Hymenoptera: Masaridae) in the southern and western Cape Province of South Africa. Ann. Cape Prov. Mus. (nat. Hist.) 18(1): 1‑30.

Gess, F.W. & Gess, S.K. 1989. Solitêre wespe: 'n waardevolle bate/Solitary wasps: a valuable asset. African Wildlife 43(1): 24‑29.

Gess, F.W. & Gess, S.K. 1990. A fourth contribution to the knowledge of the ethology of the genus Ceramius Latreille (Hymenoptera: Vespoidea: Masaridae) in southern Africa. Ann. Cape Prov. Mus. (nat. Hist.) 18(9): 183‑202.

Gess, F.W. & Gess, S.K. 1991. A preliminary survey of the aculeate wasps and the bees of the lower reaches of the Nossob River Valley, Kalahari Gemsbok National Park, southern Africa. Koedoe 34(2): 77‑88.

Gess, F.W. & Gess, S.K. 1992. Ethology of three southern African ground nesting Masarinae, two Celonites species and a silk spinning Quartinia species, with a discussion of nesting by the subfamily as a whole (Hymenoptera: Vespidae). Journal of Hymenoptera Research 1: 145‑155.

Gess, F.W., Gess, S.K. & Gess, R.W. 1995. An Australian masarine, Rolandia angulata (Richards) (Hymenoptera: Vespidae): nesting and evaluation of association with Goodenia (Goodeniaceae). Journal of Hymenoptera Research 4: 25‑32.

Gess, F.W. & Gess, S.K. 1999. The use by wasps, bees and spiders of shells of Trigonephrus Pilsb.(Mollusca: Gasteropoda: Dorcasiidae) in the desertic winter rainfall areas of southern Africa. Journal of Arid Environments 43: 143‑153.

Gess, S.K. 1992. Biogeography of the masarine wasps (Hymenoptera: Vespidae: Masarinae) with particular emphasis on the southern African taxa and on the correlations between masarine and forage plant Distributions. Journal of Biogeography 19: 491‑503.

Gess, S.K. 1993. The Karoo Violet and masarid wasp ‑ a mutually beneficial association. The Naturalist 37(2): 32‑36.

Gess, S.K. 1996. The Pollen Wasps: ecology and natural history of the Masarinae. Cambridge, Mass.: Harvard University Press. 340 pp.

Gess, S.K. 1998. Birds, wasps and Tylecodon: Pollination strategies of two members of the genus Tylecodon in Namaqualand. Veld & Flora 84(2): 56-57.

Gess, S.K. 1999. Distribution and ethology of Ceramius damarinus Turner (Hymenoptera: Vespidae: Masarinae) in Namibia. University of Kansas Natural History Museum Special Publication 24: 18‑25.

Gess, S.K. 1999. Codon flowers: chalices of hidden nectar. Veld & Flora 85(1): 30-31.

Gess, S.K. 1999. South African Bluebells. Wasps and bees, stars and bells: an intricate pollination study of Wahlenbergia. Veld & Flora 85(2): 80‑81.

Gess, S.K. 2000. Rooibos: refreshment for humans, bees and wasps: the flower visitors and pollinators of Aspalathus. Veld & Flora 86(1): 19‑21.

Gess, S.K. 2000. Karoo Violets and Pollen Wasps. Veld & Flora 86(4): 170‑171.

Gess, S.K. 2001. Distribution and ethology of Priscomasaris Gess (Hymenoptera: Vespidae: Masarinae: Priscomasarina) in Namibia. Journal of Hymenoptera Research 10(1): 16‑28.

Gess, S.K. 2001. The Karoo, its insect pollinators and the perils which they face. International Pollinator Initiative Case Study, e-article on www.ecoport.org, 18 pp.   

Gess, S.K. 2002. Pollinators: - first steps for their conservation. Science in Africa at www.scienceinafrica.co.za/

Gess, S.K. 2002. The Bees’ Needs: First steps in the conservation of bee and wasp pollinators – vital links in the maintenance of biological diversity. Veld & Flora 88(3): 114-116.

Gess, S.K. 2004. The Pollen Wasps, pp. 94-95 and Fig. 13 p. 31, In: Shinya Miyano ed. Look! Here is a bee!  Shobunsha: Tokyo pp. 1-43.

Gess, S.K. 2007. Looking after wasps and bees. Quest 3(2): 36-39.

Gess, S.K. & Gess, F.W. 1983. The private lives of meloid beetles. The Naturalist 27(3): 5‑7.

Gess, S.K. & Gess, F.W. 1988. Solitary Wasps. The Phoenix 1(3): 4‑9.

Gess, S.K. & Gess, F.W. 1989. Flower visiting by masarid wasps in southern Africa (Hymenoptera: Vespoidea: Masaridae). Ann. Cape Prov. Mus. (nat. Hist.) 18(5): 95‑134.

Gess, S.K. & Gess, F.W. 1990. Masarid wasps as potential pollinators. African Wildlife 44(6): 354‑358.

Gess, S.K. & Gess, F.W. 1994. Potential pollinators of Polhills's Cape Group of Crotalarieae (Fabales: Papilionaceae), with implications for seed production in cultivated rooibos tea. African Entomology 2(2): 97‑106.

Gess, S.K. & Gess, F.W. 2003. A catalogue of flower visiting records for aculeate wasps and bees in the semi-arid to arid areas of southern Africa. Grahamstown: Albany Museum. 529pp.

Gess, S.K. & Gess, F.W. 2004. Distributions of flower associations of pollen wasps (Vespidae: Masarinae) in southern Africa. Journal of Arid Environments 57(1): 17-44.

Gess, S.K. & Gess, F.W. 2004. The Distributions of the genera of the pollen wasps (Hymenoptera: Vespidae: Masarinae) in the semi-arid to arid areas of southern Africa in relation to their requirements for successful nesting. Transactions of the Royal Society of South Africa 59(2): 23-27.

Gess, S.K. & Gess, F.W. 2006. Survey of flower visiting by solitary aculeate wasps and bees in the semi-arid to arid areas of southern Africa. Annals of the Eastern Cape Museums 5: 1-51.

Gess, S.K. & Gess, F.W. 2007. Coastal dune vegetation and the invasive Mediterranean snail, Theba pisana. Veld & Flora: 216-218.

Gess, S.K. & Gess, F.W. 2008. Patterns of usage of snail shells for nesting by wasps (Vespidae: Masarinae and Eumeninae) and bees (Megachilidae: Megachilinae) in southern Africa. Journal of Hymenoptera Research 17(1): 86 – 109.

Gess, S.K. & Gess, F.W. 2008. One square metre of sandveld fynbos, three species of Wahlenbergia, three pollination strategies. Veld & Flora 18 - 20.

Gess, S.K. & Gess, F.W. 2010. Pollen wasps and flowers in southern Africa. SANBI Biodiversity Series 18. South African National Biodiversity Institute, Pretoria, 147 pp.

Gess, S.K. & Gess, F.W. 2014. Wasps and bees in southern Africa. SANBI Biodiversity Series 24. South African National Biodiversity Institute, Pretoria. 320 pp.

Gess, S.K., Gess, F.W. & Gess, R.W. 1997. Update on the flower associations of southern African Masarinae with notes on the nesting of Masarina strucki Gess and Celonites gariepensis Gess (Hymenoptera: Vespidae: Masarinae). Journal of Hymenoptera Research 6(1): 75‑91.