AMERICAN DIPTERA. 365 



Type. — University, Turine, Italy. 



Habitat. — Arizona (F. H. Snow) ; Huack Mts. (July 9, 

 Brooklyn Inst.) ; N. M.; also several places in Mexico. 



The specimens taken by Dr. F. H. Snow have the wings 

 much more brownish ; while those from the Huach Mountains 

 have nearly black wings. They are alike in other respects, 

 and the blackness of the wings is probably due to altitude. 

 So far as I know, the coloration of the thoracic dorsum is 

 unique. Described from six specimens. 



Deromyia symmacha. 



Diogmites symmacha Loew, Cent., X, 26, 1872. 



% 9- — Length 16-22 mm. — Brownish-yellow; antennae and palpi 

 yellow; throacic stripes usually of the same reddish-brown color, 

 sometimes darker or even black; bristles of pronotum and before the 

 halteres yellow; abdomen yellowish-red, lateral margins golden pruin- 

 ose with black spots on segments 2-5 or 6. 



Brownish-yellow; face and front densely light golden pruinose. An- 

 tennae and palpi yellow; the former with black hair, the latter with 

 yellow pile; occipital bristles almost wholly yellowish. Thoracic 

 stripes usually of the same reddish-brown color, sometimes blackish, 

 the median stripe but indistinctly divided; the median and lateral 

 stripes separated by bright golden, very distinct, pruinose stripes which 

 gradually diverge anteriorly. As in the female of discolor, the lateral 

 margins of the dorsum, the scutellum, pleurae and coxae, are bright 

 golden pruinose; bristles of pronotum yellow, thus differing from 

 those of the female of discolor, which are, almost without exception, 

 black. Hair and bristles of dorsum and scutellum black; trichostical 

 bristles yellow. Abdomen reddish, lateral margins and posterior angles 

 of all the segments golden pruinose; segments 2-6 of the male, and 

 segments 2-5 of the female, with a deep velvety, narrow, oblique, 

 black spot on the side bordering the pruinose areas in front. The 

 tergum in various lights shows a light golden bloom with black or 

 yellowish hair; male hypopygium reddish, with yellowish pile; the 

 last two segments of the female polished. Legs wholly yellowish, tips 

 of tibiae and tarsal segments darker; the short hair and bristles wholly 

 black. 



Type. — M. C. Z. One male and one female specimen. 



Habitat. — Texas (type) ; Blanco Co., Round Mt., and Luling, 

 Tex. 



Loew says that symmacha is with difficulty separated from 

 bilineata. They are very much alike and some specimens of 

 the latter are hardly distinguishable from the former except 



TRANS. AM. ENT. SOC, XXXV. SEPTEMBER, 1909 



