J96 Orthorrhapha brachycera. 



labrum, broad at the base, with a distinct salivary duet; the maxillary 

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

 with the basal part a iittle longer than the labella, these latter are 

 broad, with rather long hairs at the margin. Thorax rectangular, 

 somewhat high, and somewhat arched above; prothorax very small, 

 with small bristles above; metathorax a narrow rim, and there is 

 no chitinised metasternum. The acrostichal bristles biserial and distinct; 

 there are six somewhat long dorsocentral bristles; further a distinct 

 humeral bristle and besides a weaker, one posthumeral, two noto- 

 pleural, a præsutural, three supraalar and a postalar bristle; the front 

 part of the disc has small hairs, some of which may be a Iittle longer, 

 but scarcely forming any distinct second posthumeral bristle. Pro- 

 pleura with fine hairs and a prothoracic bristle. Scutellum bare above, 

 with two strong marginal bristles, and at each side a very small hair. 

 Abdomen elongated, more or less long and slender; it is not or only 

 slightly compressed, On the dorsal side the first tergite is shorter 

 than the folio wing; in the male the second to fifth segments are of 

 the same length, and the sixth also almost of the same length or 

 only slightly shorter. The sternites are on the whole weakly chitinised, 

 especially along the middle line; the first sternite is only represented 

 by a very narrow chitinisation, the second, third and fourth are some- 

 what chitinised, the fifth and sixth for the greatest part or quite 

 membranous; the seventh segment has as usual a chitinised sternite, 

 which lies below the tergite, and not, as in Dolichopus, at the ventral 

 base of the hypopygium; the seventh segment is thus free and forms 

 a somewhat long peduncle for the hypopygium; this latter is of a 

 characteristic shape; it is long and more or less slender, on each 

 side it terminates in a pointed apex; there are long and slender, 

 but variously shaped ventral lobes, stretching far beyond the apex of 

 the hypopygium, with very long hairs; the outer lamellæ issue on 

 the dorsal side, the hypopygium being here excised, they are narrow, 

 more or less long; the inner lamellæ are thin, styliform, variously 

 curved; the dorsal median appendage is hook-shaped, compressed. The 

 hypopygium is bent in under abdomen, the angle being between the 

 sixth and seventh segment. In the female the segments two to five 

 are normal, then foUow three hidden segments, the last with an 

 ovipositor terminating with some small spines above, and below them 

 two small styles. There are the usual dot-like impressions on the 

 second and third, less obvious or wanting on the fourth segment. 

 The segments have hindmarginal bristles. The legs are long and 

 slender, the tarsi, especially the anterior often very long, especially 

 in the males; the coxæ somewhat elongated. hi the males the front 



