FLIES OF GENUS CONOPS — CAMRAS 185 



Anteunal segment 3 much shorter than segment 2 . P. gilniorci, new species 

 Antennal segment 3 as long as segment 2 . . . P. abbrcvialus, new species 



Face entirely black, may have yellow pollen in certain lights 17 



Face with yellow at least in grooves 19 



Thorax dark, with faint white pollinose midstripe . . . C. nobilis Williston 



Thorax without white midstripe 18 



Thorax reddish with golden pollen C. brunneosericeus Krober 



Thorax dark with reddish markings C. velutinus Krober 



Face predominantly black, but may be covered with light pollen .... 20 



Face predominantly yellow or reddish 26 



Size, 18-25 mm P. magnus (Williston) 



Size, 12-15 mm 21 



First basal cell dark 22 



First basal cell nearly or entirely hyaline 24 



Facial grooves entirely or partly black; genital segments unusual. 



P. apicalis, new species 

 Facial grooves predominantly yellow pollinose; genital segments normal . . 23 

 Antennal segment 3 nearly equal segment 2. . . P. travas.sosi, new species 

 Antennal segment 3 much shorter than segment 2. 



P. infuscatiis, new species 

 Antennal segment 3 at least three-fourths of segment 2; front wider than 



high P. costariccnsis (Krober) 



Antennal segment 3 at most two-thirds of segment 2; front not wider than 



high 25 



First posterior cell mostly dark P. nigromarginatus (Krober) 



First posterior cell hyaline P. discalis (Williston) 



Front entirely black 27 



Front with yellow or reddish 45 



Cheeks black or brownish, darker than face 28 



Cheeks same as face, but may have small dark area 36 



Antennal segments 2 and 3 subequal 29 



Antennal segment 3 much shorter than segment 2 31 



First posterior cell mostly dark 30 



First posterior cell hyaline except for anterior margin. 



P. antennatus (Krober) 

 Most segments of abdomen with posterior pollinose margin. 



P. bulbirostris (Loew) 

 Only segments 1 and 2 with pollinose margin . . P. travassosi, new species 



First posterior cell mostly dark 32 



First posterior cell mostly hyaline 34 



Pollinose pleural stripe separated from humeral spot. 



P. nigromarginatus (Krober) 



Pollinose pleural stripe connected with humeral spot 33 



Yellow pollen on front diffuse P. antbreas (Williston) 



Yellow pollen on front distinct, forming two spots which may be joined. 



P. ornatifrons (Krober) 

 First basal cell as dark as wing pattern .... P. infuscatus, new species 



First basal cell hyaline, or paler than wing pattern 35 



First basal cell usually partly darkened; male with distinct abdominal rings; 



theca long P. discalis (Williston) 



First basal cell entirely hyaline; male with indistinct abdominal rings; female 



theca short P. angustus (Krober) 



Antennal segment 3 longer or about equal to segment 2 37 



Antennal segment 3 distinctly shorter than segment 2 41 



