Superfamily SPHECOIDEA 1601 



Taxonomy: Pate, 1937. Amer. Ent. Soc, Trans. 63: 90-93 (key to gen.). —Evans, 1958. Amer. 

 Ent. Soc, Trans. 84: 126-136, figs. 49-57, 60-69 (larvae). —Evans, 1964. Amer. Ent. Soc, 

 Trans. 90: 246-253, figs. 17-25 (larvae). 



Tribe PEMPHREDONINI 



Genus DIODONTUS Curtis 



Diodontus Curtis, 1834. Brit. Ent., v. 11, text for pi. 496. 



Type-species: Pemphredon tristis Vander Linden. Desig. by Internatl. Comn. Zool. 

 Nomencl., 1968. Op. 844, Bui. Zool. Nomencl. 25: 10. 

 Xylocelia Rohwer, 1915. U. S. Natl. Mus., Proc 49: 243. 



Type-species: Diodontus occidentalis Fox. Orig. desig. 



Members of this genus nest in the ground. Aphids are the normal prey, but there is one record 

 of a leafhopper being used. 



Taxonomy: Mickel, 1916. Ent. Soc. Amer., Ann. 9: 344-352 (N. Amer. spp.). — Krombein, 1939. 



Brooklyn Ent. Soc, Bui. 34: 143 (key to N. Y. spp.). — Bohart and Menke, 1965. Bui. Zool. 



Nomencl. 22: 257-258 (request to place Diodontus on Official List of Generic Names with 



tristis as type-species). 

 adamsi Titus. Mich. (Isle Royale). 



Diodontus adaynsi Titus, 1909 (1908). Mich. Board Geol. Survey Rpt. for 1908, p. 319. 9. 

 americanus Packard. Maine, Wis. Ecology: Nests in soil. Prey: Choke-cherry aphids. 



Diodontus americanus Packard, 1867. Ent. Soc. Phila., Proc. 6: 393. 9. 



Biology: Peckham and Peckham, 1898. Wis. 'Geol. Nat. Hist. Survey, Bui. 2: 99-107, pi. 10, fig. 

 5, pi. 14, fig. 3 (nest, prey, life cycle). 

 antennatus (Mickel). Nebr. (Omaha). 



Xylocelia antennatus Mickel, 1916. Ent. Soc. Amer., Ann. 9: 348. 9. 

 argentinae Rohwer. Colo., Wyo. Ecology: Nests gregariously in flat sand and makes up to 5 

 cells per nest. Parasite: Diptera sp. Prey: Aphididae sp. or spp. Predator: Philanthus 

 pulcher D. T. 

 Diodontus argeiitinae Rohwer, 1909. Amer. Ent. Soc, Trans. 35: 104. 6. 



Biology: Evans, 1970. Mus. Compar. Zool., Bui. 140: 486 (nest, prey, parasite, predator). 

 ater (Mickel). Nebr., Kans., Pa. Ecology: Nests in vertical sand or clay bank, and in sloping 

 gravel bank. Prey: Aphididae sp. or spp. Predator: Philanthus pacificus Cr. 

 Xylocelia ater Mickel, 1916. Ent. Soc. Amer., Ann. 9: 351. 9. 



Biology: Rau, 1922. Acad. Sci. St. Louis, Trans. 24: 21 (nest). —Evans, 1970. Mus. Compar. 



Zool., Bui. 140: 486-487 (nest, prey, predator). 

 beulahensis (Rohwer). N. Mex. (Beulah). 



Xylocelia beulahensis Rohwer, 1917. U. S. Natl. Mus., Proc 53: 174. 9. 

 bidentatus Rohwer. N. B., N. Y., Mich. 



Diodontus bidentatus Rohwer, 1911. U. S. Natl. Mus., Proc. 40: 560. S. 

 brunneicornis Viereck. Kans. (Sedgwick Co.). 



Diodontus brunneicornis Viereck, 1906. Amer. Ent. Soc, Trans. 32: 212. 6. 

 cockerelli Rohwer. Colo. (Florissant). 



Diodontus cockerelli Rohwer, 1909. Amer. Ent. Soc, Trans. 35: 105. 6. 

 crassicornus Viereck. Oreg. (Corvallis). 



Diodontus crassicornus Viereck, 1904. Amer. Ent. Soc, Trans. 30: 243. 6. 

 flavitarsis Fox. Colo. 



Diodontus flavitarsis Fox, 1892. Amer. Ent. Soc, Trans. 19: 316. S. 

 florissantensis Rohwer. Colo. (Florissant). 



Diodontus florissantensis Rohwer, 1909. Amer. Ent. Soc, Trans. 35: 107. 9, <J. 

 franclemonti (Krombein). N. Y., Pa., Md., D. C, Va., Mich. Ecology: Nests gregariously in 

 sand. 



Xylocelia fraticlemonti Krombein, 1939. Brooklyn Ent. Soc, Bui. 34: 141. 9,6. 



