156 NEW NORTH AMERICAN ANTHOMYIIDAE (dIPTERa) 



Pernale. — Differs from the male in color in having the thorax with a broad 

 brownish black vitta on each side of dorsum, which does not extend beyontl 

 middle posteriorly, and usually also a narrow central vitta; abdomen with 

 five blackish spots as in male, the other markings absent. 



P'rons at vertex less than one-third of the head-width, much wider anteriorly ; 

 orbits narrow, with a few hairs laterad of the bristles; ocellar triangle narrow, 

 jioorly defined, shinijig in part, not extending to anterior margin. Bristles 

 on tibiae rather variable in number, the fore tibia sometimes unarmed at 

 middle and sometimes witli one or two bristles on posterior surface. 



Length, G to 7 mm. 



Tijpe.— d'; Makaiida, Illinois, June 4, 191i), (Illinois]. Allo- 

 tijpe. — 9; topotypical. Fnratypes. — Two males, Makancla, Illi- 

 nois; June 5, 1919; one male, one female, Alto Pass, Illinois, 

 June 6, 1919; one male, Chester, Massachusetts, August 5, 1911 ; 

 one female, Cornish, New Hampshire, July 13 (C. W. Johnson). 

 The Illinois specimens were taken by the writer and C. P. Alex- 

 aiulei'. 



This s]iecies in Illinois was found at rest on vertical I'ock sur- 

 faces. 



Related to torrey<ie Johannsen, fi-om which it readily may ho 

 separated by the form of the head in both sexes, the profile differ- 

 ing as shown in figui-es 36 and 39 in the males, the frons in fe- 

 males of torreyae being entirelj^ opacjue. 

 Trichopticus coquilletti s]). n. 



Male. — Black, shining, the dorsum of abdomen with drab-gray pruines- 

 cence except on a narrow central vitta. Wings slightly browned. Calyptrae 

 yellow. Knobs of halteres black. 



Eyes with dense long hairs; frons about as wide as anterior ocellus; arista 

 pubescent. Thorax without presutural acrostichals; postsutural dorso- 

 centrals, four pairs; prealar not developed. Abdomen cylindrical, slightly 

 tapered apically. Apical joint of fore tarsus more distinctly laterally com- 

 pressed than in hirsutu'a, the dorsal ridge higher; preapical joint with two 

 or three strong bristles at apex; mid femur with a series of bristles on basal 

 half of postero-ventral surface, which are directed apicad and lie rather close 

 to surface, the last bristle in series much stronger than the others; mid tarsus 

 i)roadened apic^ally, the fourth joint broader than long; mid tibia with three 

 or four i)osterior bristles; hind femur with soft, erect hairs on posterior siu'- 

 face, and a series of bristles on apical half of antero-ventral surface; hind 

 tibia slightly curved, with a long, stout, blunt spur consisting of three or 

 four clo.sely fused bristles at apex of ventral surface, antero-dorsal and antero- 

 ventral surfaces with erect fine hairs, the length of which does not exceed 

 diameter of tibia, jjostero-dorsal surface with a long bristle about one-fourth 

 from ;ip(.\, pn>;ipic;il dorsMl bristle short. Venation tKinn.MJ. L(>ngth, ()..") 



