68 C. H. TYLER TOWNSEND. 



41. Oeyptera eiiehenor Walk. 



Illinois (Forber^) ; twenty specimens, measuring 8-10.5 mm. Of 

 0. dosiades Walk., there were ten specimens from same locality, 

 measuring 5-7.5 mm., and all normal in size and color. Though it 

 is difficult to separate these two forms, yet it hardly seems probable 

 that they are all the same species. Dr. E. Giglio-Tos doubtfully 

 unites them in his recent work on Mexican Diptera (Ditt. Mess., iii, 

 J). 1 ). The differences in size are too great, I believe, to admit of 

 this view. 



45. Heniyda an rata R. D. 



I have four specimens fr )m Illinois (Forbes), and one from State 

 of Washington (Williston). Two of the Illinois specimens are 

 males and two females. The Washington specimen is a female. 

 The female is the smaller, has the shorter claws and pulvilli, and the 

 pale yellow markings of the abdomen are not so heavy. The front 

 is about one-third the width of the head in both sexes. R. D. says 

 that, in H. aurata, the posterior half of the second segment is pale 

 testaceous. In the above five specimens the second segment is broadly 

 })ale yellow on the sides, the yellow being separated by a median 

 Ijlack vitta which broadens out and forms the hind margin of the 

 segment. The pale yellow anterior fascia of third segment is very 

 narrow and interrupted in the middle in the females, but is much 

 liroader, and with a tendency to become entire anteriorly in the males. 

 I consider the above specimens, however, the same as Desvoidy's 

 species, which is doubtless the only species of this genus in North 

 America or elsewhere. 



PSEITDOHYSTRICIA Brauer and v. Berg. 

 Goieral cliavaderx. — Robust species with spiny macrochsette, hav- 

 ing the facies of Dejeanla, but easily distinguished by the hairy eyes. 

 Belongs to the Hystriciinse. Head quadrilateral in profile ; front of 

 male twice as broad before as at vertex, more than one-third width 

 of head in middle, prominent in profile, face nearly twice as wide ; 

 frontal bristles strong, descending about as low as base of thii'd an- 

 tennal joint, vertical bristles and about next four pairs directed 

 backward, rest inward and decussate ; no orbital bristles in male. 

 Face a little receding, epistoma very prominent ; facial depression 

 more than one-half width of face, oval in outline, shallow ; facial 

 ridges bare, except several bristles next vibrissiB, constricted below ; 

 sides of face wide, clothed with some fine long hair ; cheeks very 

 wide, fully three-fourths of eye-high t, hairy posteriorly ; vibrissa 

 strong, inserted a good distance above oral margin. Eyes quite 



