Dolichopodidae. 49 



separated in both sexes, narrowly in the male, broadiy in the female. 

 The postocular bristles form a single row, besides there are bristles 

 at and above the oral aperture. Antennæ inserted near to each other, 

 above the middle; the first joint obconical, a little elongated; it is 

 produced into a small, pointed protuberance at the apex on the inner 

 side below; the second joint is lobe-like inserted into the third on 

 the inside, and also above on the outside ^ ; the third is short triangular, 

 It bears a dorsal, two-jointed arista, with the basal joint somewhat 

 short. hl the female the antennæ are a little shorter, especially the 

 basal joint. The basal antennal joint has no hairs above, the second 

 has small bristles at the apical margin, the third joint and the arista 

 are short-haired. Epistoma narrow in the male, slightly widened both 

 upwards and downwards; in the female it is broad with parallel 

 margins. Glypeus short, slightly marked off, most in the female, where 

 it is somewhat arched; it does not reach the lower margin of the 

 eyes. The oral aperture and proboscis are somewhat larger in the 

 female than in the male; the proboscis is shghtly, almost not, pro- 

 truding; the mouth parts I have otherwise not examined. Thorax 

 rectangular, high, somewhat arched above. The acrostichal bristles 

 biserial; there are six long dorsocentral bristles, further a humeral, a 

 posthumeral, two notopleural, a præsutural, three supraalar and a 

 postalar bristle, and besides small hairs on the anterior part of the 

 disc. Prothorax has fine hairs on the pleural parts, but there are 

 no prothoracic bristles; the sternopleura have a few hairs, and the 

 pteropleura have hairs below; the metaepimera with hairs on the 

 posterior side. Scutellum with two long bristles, and on each side a 

 small hair. Abdomen somewhat long and slender, the first seg- 

 ment is short; in the male six segments are distinctly visible both 

 on the dorsal and ventral side, they decrease in length behind. 

 Hypopygium small and concealed. In the female there are five visible 

 segments. Abdomen has no dot-like impressions at the side margins. 

 The segments have hindmarginal bristles. Legs somewhat long, the 

 coxæ elongated, hind metatarsus shorter than the second joint, with- 

 out bristles above. The legs are haired with short hairs; the posterior 

 legs have some bristles, and the femora preapical bristles; the posterior 

 tibiæ have apical bristles, the front tibiæ none; the hind coxæ have 

 a bristle on the outer side. There are two claws, two rather large 



1 Loew (Mon. of Dipt. of N. Am. II. 1864, PI, VI, fig. 28, b) figures the antenna, 

 but his somewhat small figure is not correct with regard to the shape of the 

 second joint; in the text (153) on the other hånd it is mentioned in a general 

 way, as he says about the antennal joints: "the second much overreaching the 

 third". 



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