FLIES OF GENUS CONOPS — CAMRAS 163 



Material examined: Mexico: Frontera, Tabasco, Mar. 3, Town- 

 send, 1 male (USNM). Panama: Nata, September 1946, N. L. H. 

 Krauss, 1 male (USNM) ; Barro Colorado, Dec. 1, 1930, H.F.Schwartz, 

 1 male (AMNH). 



Physoconops (Pachyconops) gracilis (Williston) 



Conops gracilis Williston, Trans. Connecticut Acad. Arts Sci., vol. 6, p. 337, 1885. 



This species replaces brachyrhynchus in the western United States, 

 and differs typically in being predominatly reddish with pleural stripe 

 golden, front entirely yellow, and absence of spot in facial grooves. 

 However, most specimens show a trace of the spot in the facial grooves 

 and in some it is very distinct. The pleural stripe may be whitish 

 as in the specimen from Mexico (Fresnillo), which is also rather dark 

 in general with a prominent groove spot. However, the front is 

 entirely yellow in that specimen. 



Krober used this name for townsendi (=auratus) and some speci- 

 mens of rujus. His records of this species from Brazil and Chile 

 apparently belong to rujus. 



Range: United States: Colorado, New Mexico, Arizona, California. 

 Mexico. Colombia. 



Material examined (Neotropical): Mexico: Fresnillo, Zacatecas, 

 7,000 ft., Aug. 15, 1947, Michener, 1 male (AMNH). Colombia: 

 Cauca Valley, CaU District, 3,260 ft., 1935, H. F. Schwartz, 1 male 

 (AMNH). 



Physoconops (Pachyconops) brachyrhynchus (Macquart) 



Conops brachyrhynchus Macquart, Diptferes exotiques, vol. 2, p. 315, 1848. 

 Conops xanthopareus Williston, Trans. Connecticut Acad. Arts Sci., vol. 4, p. 332, 



1882. 

 Conops fenestratus Krober, Arch. Naturg., vol. 81, Abt. a. Heft 5, p. 134, 1915. 



This predominantly dark species is rather variable, and the two 

 sizes of theca (very small or moderate) suggests that two species may 

 be involved. The front is partly dark, but in some specimens the 

 front is nearly entirely yellow, and in others an indistinct T-pattern 

 is formed. The pleural stripe is ordinarily white, but may be yellow. 

 The dark mark on the facial grooves may be completely absent. 



In rare cases, antennal segment 3 is longer than segment 2, and 

 quite robust, thus agreeing with the subgenus Aconops; but the other 

 characters of that group are, of course, absent. 



Range: Massachusetts to northern Florida (Gainesville), west to 

 Wyoming and Texas. 



Physoconops (Pachyconops) floridanus, new species 



Description: Male: Length lOK mm. Front and vertex blackish 

 brown, darker at ©cellar swelling, in front of vertex, and above anten- 



338379—55 2 



