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

GESS, F.W. and 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. and 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. and 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. and 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. and 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. and GESS, F.W. 1983. The private lives of meloid beetles. The Naturalist 27(3): 5‑7.

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

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

GESS, S.K. and 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. and 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. and 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. and 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. and 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. and 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.