73 
2. Abdomen black, sides of first two segments and usually the front 
corners of the third, yellowish, front femora almost wholly 
black, three sternopleural macrochsetae ; length , G mm. Colorado 
and southern California. (Jour. Acad. Nat. Sci. Philadelphia, 
Vol. VI, p. 173; 1821): Ocyptera. Stevenia pictipes Bigot, Ann. 
Soc. Ent. France, p. 254; 1888.) arcuata Say. 
Abdomen wholly yellow, front femora broadly yellow at the base; 
two sternopleural macrochaetae ; length, G mm. Northern Vir- 
ginia. (Jour. Acad. Nat. Sci. Philadelphia, Vol. VI, p. 172; 
1829: Phasia. Tachina corythus Walker, List of Dipterous 
Insects, Part IV, p. 797; 1819. Wahlbergia atripennis Town- 
send, Proc. Ent. Soc. Washington, Vol. II, p. 145; April 2, 
1891.) atripennis Say. 
Genus HEMYDA Desv. 
Hemyda Desvoidy, Essai stir les Myodaires, p. 22(5; 1830. 
Our single species is black, the palpi, humeri, a large spot on each 
side of the second abdominal segment at the middle, the front corners 
of the third segment, the coxsb, tibia' and a large portion of the femora, 
yellow; three postsutural and one sternopleural macrochaetae, scutellum 
bearing three marginal pairs; frontal vitta highly polished; length, 
11 mm. Northern Illinois. (Loc. cit.) aurata Desv. 
Genus BESKIA Br. and Berg. 
Beslcia P>raner and Bergenstamm, Zweif. Kais. Museum Wieu, TV, p. 139; 1889. 
Ocyptero8tpha Townsend, Journal N. Y. Ent. Soc, Vol. II, p. 79; June, 1894. 
This synonymy has already been published by Dr. Williston. 1 The 
type species is black, the abdomen yellow, calypteres white, wings 
smoky, three postsutural and three sternopleural macrochaetae; length, 
6 mm. Boykins, 7a.; Tifton, (la.; and Texas. (List of Dipterous 
Insects, Part IV, p. 79(>; 1811): Tachina. Beskia comuta Brauer and 
Bergenstamm, Zweif. Kais. Mus. Wien, IV, p. 170; 1889. Ocyptero- 
sipha willistoni Townsend, Journal N. Y. Ent. Soc., Vol. II, p. 79; 
June, 1891.) celops Walk. 
Genus IS0GL0SSA Coq. 
Isoglossa Coquillett, Canadian Entomologist. Vol. XXVII, p. 125; May, 1895. 
The type species is black, the palpi, sides of last three abdominal 
segments except the hind margins of the second and third, and the 
apex of the abdomen, yellow; three postsutural and three sternopleural 
macrochaetae; length, G mm. From the type specimen. Los Angeles 
County, Cal. (Loc. cit., p. 126.) hastata Coq. 
Manual X. Amer. Diptera, p. 119; 1896. 
