AMERICA N DIPTEK v. 353 



shorter than in ehrmanni. I )orsum scarcely shining, with one pair of dorsocentral, 

 two large and two smaller scutellar macrochaetae. 1 1 a I teres black, white pollinose. 

 Anterior legs black at base and varying through brown in luteous on the tarsi, 

 the last joint of which is enlarged ami flattened as in t lie European coronatu ; the 



tibiae with a single external bristle just before the middle. Middle and hind 

 legs with the trochanters and knees yellowish; middle tibiae with a pair of setae 

 just be I'n re the middle and a third just before apex on outer side, as well as a sin- 

 gle long apical spur. Hi ml tibia- with t wo grooves above, inclosing a longitudinal 

 carina : with one bristle just before the middle and another just before the apex 

 which bears two long ami several short spines; there are also about three comb- 

 like rows on the inner side at apex. Abdomen shining, second segment very 

 much elongated ; hypopygium large, ventral, shining. Wings hyaline, yellowish 

 bet ween the thick basal nervurcs, which are ferruginous. Cilia of costa dense, 

 but not long; first vein meeting the costa a little more than halfway from the 

 humeral vein to tip of third longitudinal ; the latter straight, with a small knob 

 at apex : costal vein reaching to about the middle of the wing ; fourth vein curved 

 at the base, straight elsewhere; fifth vein straight throughout ; seventh not very 

 distinct ; apex of wmg much nearer to tip of fourth vein than fifth ; fourth vein 

 far away from third at its point of origin. 

 Length 5 mm. 



Described from a single male specimen, collected at Riverton, 

 N. J., August 31, by Mr. C. W. Johnson, after whom 1 take great 

 pleasure in naming this interesting species. 



The present species is evidently closely related to coronata Becker, 

 of Europe (Becker, Monog. Phor., 41), but differs very clearly in 

 the frontal cheatotaxy, form and color of antennae and palpi, and 

 wing venation. 



The antennae of this species recall strikingly those of Conieera, 

 yet the insect does not have the habitus or other characters of that 

 genus. It would seem that the form of the antennae alone cannot 

 be a very valuable character for the definition of genera. 



This may possibly prove to be the male of ehrmanni, but the dif- 

 ferences between the two are so much greater than those between 

 the sexes of the closely related coronata that 1 have no doubt they 

 will prove to be quite different species. Unfortunately it is impos- 

 sible to be absolutely sure. 



llypooera ehrmanni sp. nov vl (Plate vi, fig. 20.) 



"Female. A large and robust species; everywhere shining black except the 

 antennae and palpi, which are deep yellow, the former reddish, with a long black 

 arista on the oval third joint. Trochanters also somewhat red and the knobs of 

 the halteres more brown than black, the stems yellowish. Front very polished, 

 punctured and hairy on the sides, smooth in the middle. Anterior pair of frontal 

 bristles present, approximate ami reclinate; next row above arcuate, the row 

 above less so and placed high up. No ocellar tubercle, but the vertex is sharp, 



TKANS. AM. ENT. SOC. XXIX. (45) NOVEMBER. 1903. 



