Vol. XXIX] ro.MoLoCICAL NEWS l8l 



numerous long, slender, upright bristles, irregularly ar- 

 ranged except a row along the hind edge of each segment; 

 hind tibia bearing among others a ro\v of strong bristles down 

 the inner hind side; no costal spine; third and fourth, veins al- 

 most parallel; sixth vein well developed at base, becoming 

 evanescent and disappearing at about two-thirds the distance 

 to the margin. 



The male has a narrow front and the female has cruciate 

 'frontals ; but these are less important characters than some at 

 least of the preceding' list. 



Schnabl and Dziedzicki include two species with yellow hal- 

 teres, one with plumose arista, one with wide front in male. 

 \Ye are not concerned with these at present. The four species 

 herein treated agree very well in characters, and unquestionably 

 belong together. The genus belongs to Phaoninae. differing 

 from Phaonia mainly in the protuberant epistoma with up- 

 curved bristles, the black halteres and the general intense black- 

 color. Most Phaonias have hairy eyes, and none of the forty 

 species in my collection has black halteres. 



Table of Species. Male and Female. 



1. Parafacial as wide as the length of the third antennal joint; front 



tibia with 4 bristles on outer hind side in male, 3 in female.... 2 



Parafacial narrower than length of third antennal joint; front 



tibia with 2 bristles on outer hind side (rarely 3 in female) ... .3 



2. Front of male twiee as wide as distance between hind ocelli ; mid 



basitarsus with two rows of stont spines below, which in the 

 male are longer than the width of the joint, in the female not 



quite so long ( Colorado ) spinitarsis n. sp. 



Front of male not as wide as the distance between the hind ocelli, 

 mid basitarsus in both sexes without unusual spines (Europe. 

 Colorado) alpicola Ron dan i 



3. Eastern species (Ontario to Wisconsin and Illinois) ; parafacials sur- 



passing the width but not equaling the length of the third anten- 

 nal joint; palpi elongate; wings yellow, especially the veins; 

 abdomen in male brownish-gray pollinose with narrow median 



black stripe nitens Stein 



Western species ( llritish Columbia to Mexico and Colorado); para- 

 facials as wide as third antennal joint; palpi usually not elon- 

 gate; wings infuscatcd; abdomen subshining black, 



aterrima Van der \Vulp 



