392 S. W. Williston — JVorth American Conopidm. 



Unrecognized species. 



castanoptera Loew, Neue Beitr., etc., i, 33 (Conops)-, Williston, 

 these Trans., iv, 336 (translation of the original). 



ZODION. 

 Zodion Latreille, Precis des caract, gener. d. ins., 1V96. 



1. — Scutellum triangular; thorax and abdomen with opaque black 

 spots. pietulum. 



Scutellum oval. 2. 



2. — Very small species, cheeks narrow ; abdomen with opaque black 

 triangular spots. pygmaeum. 



Not very small species ; abdomen without such spots. 3, 



3. — Thorax with a pair of median pollinose stripes; abdomen with 

 * oblique pollinose spots on the third segment at least. 



leueostoma. 

 Thorax pollinose, Avith at least two slender black stripes, abdo- 

 men more uniformly pollinose. fulvifrons. 



" 9 . Very small, black cinereous, abdomen opaque, the sides and 

 a median longitudinal line of the sixth segment cinereous 

 pollinose, sixth and seventh segments reddish. Length, 1^ lin." 

 (about 3™""). nanellum. 



nanellum Loew, Centur., viii, 15 ; Williston, these Trans., ante, p. 

 382. D. C. (Lw.). 

 f Zodion Occidensis Walker, List, etc., iii, 676. — Ohio. 

 pygmseum Williston, these Trans., ante, p. 381. — Cal., Col. 

 pietulum Williston, these Trans., ante, p. 379. — N. M. 

 fulvifrons Say, Jour. Phil. Acad. N. Sc, iii, 83 ; Compl. Wr., ii, 74 ; 

 Wiedemann, Auss. Zw. Ins., ii, 241, 1 ; Williston, these Trans., 

 ante, p. 380. — New Eng., Cal, Wash. Terr., Ariz. 

 Zodion abdoniinale Say, Jour. Acad. Phil., iii, 84, 2 ; Compl. 

 Wr., ii, 74; Wiedemann, Auss. Zw. Ins., ii, 242, 2 (translation 

 of the original). 

 ? Myopa rubrifrons Robineau Desvoidy, Essai Myod., 247, 17. 

 leueostoma Williston, these Trans., ante, p. 380. — Mont., Kan., 

 Ariz., Wash. Ty. 



Unrecognized Species. 

 Amerieanum Wiedemann, Auss, Zw. Ins., 242, 3. — Montevideo. 

 splendens Ja^nnicke, Neue Exot. Dipt., 97. — Mexico. 



ONCOMYIA. 



Occomyia Robineau Desvoidy, Dipt, des environs de Paris, Myo- 



paires, 50, 1853. 

 Thecophora Rondani, Dipt. Ital. Prod., i, 58, 1856. 

 Oncomyia Loew, Centur., vii, 73. 

 1. — Second joint of the antennae but little or not at all longer than 

 the third. Baroni. 



Second joint of the antenna? considerably longer than the 

 third. 2. 



