166 Orthorrhapha brachycera. 



group of species {nigripeimis Fall., lahiatus Loew, rostellatus Loew 

 and prohoscideus Beck.) it is longer, approximately as long as the head 

 is high. Labrum slrong, high at the insertion, three-pointed with the 

 middle point longest and curved somewhat downwards ; it is semitubular 

 so that the lateral points are lying lower than the median; hypo- 

 pharynx elongated triangular, pointed, of the length of labrum; max- 

 illary palpi oval, squamiform, hairy and with a bristle at the apex. 

 Labium with the basal part a little longer than the labella; these 

 latter are broad, with hairs along the margin. Thorax somewhat 

 high, rectangular and somewhat arched above; prothorax small and 

 with small bristles above; metathorax likewise a small rim, and there 

 is no chitinised metasternum. Acrostichal bristles biserial and distinct; 

 there are six long dorsocentral bristles, longest behind; further a 

 humeral bristle and generally one or two small, one strong post- 

 humeral bristle and one smaller, a præsutural, three supraalar, two 

 notopleural and one postalar bristle; the front part of the disc has 

 small hairs, from which the inner posthumeral bristle is generally 

 shghtly marked; propleura have slight, short hairs and a black pro- 

 thoracic bristle. Scutellum either almost bare, only with a few hairs 

 above and some at the margin, or it is somewhat densely short- 

 haired; it has two strong marginal bristles, and in some species a 

 small hair on each side. Abdomen a little compressed, conical; the 

 first dorsal segment a little shorter than the following; in the male 

 the following segments of about equal length, the sixth small, the 

 seventh likewise small, lying to the left side of the hypopygium. The 

 first ventral segment is only represented by an exceedingly narrow 

 chilinisation in front of the second; segments two to four are normal, 

 the fifth and sixth for the greatest part membranous, the seventh has 

 a chitinised sternite, lying above at the hypopygium. The hypopygium 

 is free, somewhat pedunculated, curved in under abdomen ; it has 

 ventral lobes of various shape, lying about in the middle, and some- 

 times also posterior ventral lobes; the inner lamellæ are of various 

 shape, and likewise the outer, which are small or larger. In the 

 female the abdomen has five normal segments and three hidden; the 

 ovipositor terminates with a semicirclet of small spines above, and 

 below them two small styles. At the side margins of abdomen there 

 are dot-like impressions on the second, third and fourth segments, 

 sometimes less obvious on the latter; the abdominal segments have 

 hindmarginal bristles. Legs chiefly as in Dolichopus; only rarely they 

 may show secondary sexual characters in the male, such as dllated 

 joints on front or middle tarsi, or they may be thickened, curved or 

 specially bristly. Hind metatarsus as long as or considerably shorter 



