FLIES OF GENUS CONOPS — CAMRAS 183 



Physoconops {Physoconops) angusliis (Krober) 



Conops angustus Krober, Arch. Naturg., vol. 81, Abt. a, Heft 5, p. 152, 1915. 



I This name is used here for a form related to nigromarginatus as dis- 

 tinguished from the discalis-infuscatus group. In nigromarginatus, the 

 front is usually narrower, the first basal cell is entirely hyaline, and 

 the theca is short; while in the discalis-infuscatus group the front is 

 wider, the first basal cell usually partly or entii'ely clouded, and the 

 theca is relatively long. 



Range: Argentina and Brazil. 



Material examined: Brazil: Nova Teutonia, Sept, 4, 1938, F. 

 Plaumann, 1 female (BM). 



Physoconops (Physoconops) nigromarginatus (Krober) 



Conops 7iigromarginatus Krober, Arch. Naturg., vol. 81, Abt. a. Heft 5, p. 151, 1915. 



I This species is somewhat variable over its extensive range, but repre- 

 sents a distinct entity, easily recognized by the dark first posterior 

 cell and very hyaline basal cells. The relatively narrow front dis- 

 tinguishes it (and angustus) from the discalis-infuscatus group as well 

 as from the anthreas-ornatifrons group. From the angustifrons group 

 it is readily distinguished by the dark cheeks. 



Range: Mexico, Brazil, Bolivia. 



Material examined: Bolivia: Mapiri, 1 male (cotype, USNM). 

 Brazil: Campinas, Goyaz, Jan. 2, 1936, Burgmeyer and S. Lopes, 1 

 female (USNM); Rio de Janeiro, Dec. 12, 1915, J. G. Foetterle, 1 male, 

 1 female (USNM); Grajahu, Rio de Janeiro, Aug. 20, 1939, July 18, 

 1937, Sept. 22, 1937, S. Lopes, 1 male, 2 females (USNM); B6a 

 Vista, Tapajos, Para, Townsend, 1 female (USNM). Mexico: San 

 Rafael, July 1, Townsend, 1 male (USNM). 



Physoconops {Physoconops) anthreas (Williston) 



Conops anthreas Williston, in Godman and Salvin, Biologia Centrali-Anaericana, 



Diptera, vol. 3, p. 80, 1892. 

 Conops mexicanus Krober, Arch. Naturg., vol. 81, Abt. a. Heft 5, p. 128, 1915. 



This and the following species are closely related, and intergradation 

 probably will be found. They have a relatively wider front than the 

 nigromarginatus and angustifrons groups, and a dark first posterior cell 

 and short theca in contrast to the discalis-infuscatus group. 



, Range: Mexico. 



1 Material examined: Mexico: Atoyac, Vera Cruz, April, H. H. S., 

 1 male (cotype, AMNH). 



