FLIES OF GENUS CONOPS — CAMRAS 181 



The male cotype (AMNH) from Teapa, Tabasco, Mexico, has been 

 examined, Williston's description of the male as "face blackish, in 



' the depression yellowish" does not fit this specimen and may be an 

 error. The face is yellow, with darker yellowish grooves and brown 

 cheeks. There may be another cotype male which belongs to what I 

 am considering a melanistic form. This form (Jormosus Krober) has 

 the face black, but the gi'ooves are yellowish. The type oi jormosus 

 in the Vienna Naturhistorisches Museum, Vienna, has been checked 

 for me by Dr. Helmut Mayer. 



Recent examination of a large series of specimens from Mexico re- 



j veals so much intergradation between this species and semifuscus that 

 the latter can no longer be maintained. In South America, typical 

 discalis is again replaced by a yellow-cheeked form which is almost 



I indistinguishable from semifuscus. 



' Range: United States (Texas, Utah, New Mexico, Arizona), Mex- 



I ico, Guatemala, Costa Rica, Brazil, Bolivia, Paraguay, Argentina. 



Physoconops {Physoconops) obscuripennis (Williston) 



Conops obscuripennis Williston, Trans. Connecticut Acad. Arts Sci., vol. 4, p. 328, 



1882. 

 Conops hrachyrhynchvs (Authors, not Macquart). 

 Conops foxi Van Duzee, Proc. California Acad. Sci., vol. 16, p. 574, 1927. 



The western variation (Joxi) has the posterior margin of the wing 

 hyaline and is relatively paler brown behind the third vein. 



Range: Massachusetts to Florida, west to British Columbia, 

 Washington, Colorado, and Texas. 



Physoconops (Physoconops) nitens, new species 



Description: Male: Length 9 mm. Front opaque black, somewhat 

 reddish below. Vertex blackish red, slightly yellow pollinose in front 

 of ocellar swelling. Face reddish yellow with a narrow black margin 

 extending to the cheeks. Facial gi'ooves dark, cheeks yellowish pol- 

 linose, and orbits golden yellow pollinose. Antennae yellow on seg- 

 ments 1 and 2, narrowly black dorsally on segment 2. Antennal seg- 

 ment 3 rufous. Arista rufous except for black on the tip. Proboscis 

 blackish, l}i times head height. Occiput blackish, yellow pollinose 

 narrowly below on the orbital margin and below the vertex. Thorax 

 black, faintly yellow pollinose more distinct medial to the humeri, pro- 

 pleurae, at base of wings, on metanotum, and lower pleurae. Legs 

 reddish brown, yellowish on anterior femora, base and tip of midfemur 

 and posterior femur, basal third of tibiae, tarsi except sides, claws ex- 

 cept tips, and pulvilli. Wings with pattern not as dark as usual, 

 extending from costa to third vein. Very faint at first basal cell and 

 paler in submarginal cell dis tally along the third vein. Remainder of 



