358 Orthorrhapha brachycera. 



are five dorsal segments of the same length, and the sixth dorsal 

 segment is also visible, but smaller; the seventh segment is small and 

 quite hidden; on the ventral side there are five segments of equal 

 length, except the first, which is as usual very short, and lying as a 

 very small chitinisation at the front end of the second. The hypo- 

 pygium is small and roundish; I could not detect any ventral lobes, 

 but there seem to be small, hairy outer lamellæ, situated in a dorsal 

 excision, and probably somewhat united; the hypopygium is directed 

 downwards and imbedded, only the end of it with the eighth segment 

 may just be seen at the apex of abdomen, and here also the small, 

 hairy piece, which I take to be the outer lamellæ, is often seen, and 

 sometimes the thin penis projects downwards. In the female there 

 are five normal segments, the rest hidden. Dot-like impressions are 

 present on some (second to fourth) segments. Abdomen has short 

 and generally not very distinct hindmarginal bristles at the sides of 

 the segments, only on the first segment they are long; the eighth 

 segment has fine hairs. Legs somewhat long and slender; in the 

 male they are in most species peculiarly formed or armed with 

 bristles, and it may be either all legs or only the anterior or middle 

 ones which are thus remarkable, and it may be both femora, tibiæ 

 and tarsi, or only femora and tibiæ; in many species especially the 

 middle tibiæ and tarsi are very peculiar, the metatarsus short and 

 remarkably shaped. The hind metatarsus is about of the length of 

 the second joint or a little shorter, without bristles. The legs have 

 some ordinary bristles, which in the species with peculiar legs are 

 present only in the females; there are generally on the front tibiæ 

 one dorsal and one postero-ventral bristle, on the middle tibiæ three 

 antero-dorsal, one postero-dorsal, and two, sometimes only one ven- 

 tral ; the hind tibiæ have dorsal bristles and generally two ventral. 

 The hind femora have a preapical bristle, and all tibiæ have apical 

 or preapical bristles; hind coxæ with a bristle on the outside. There 

 are two claws, two pulvilli, and a well developed, somewhat comb- 

 shaped empodium with long bristles below. ^ Wings somewhat long 

 and narrow; the mediastinal vein terminates in the subcostal vein; 

 the discai vein is straight and parallel or about parallel with the 

 cubital vein; the posterior cross-vein placed in or a little behind the 

 middle; anal vein not specially short, Axillary lobe well developed. 

 Costa has a long bristle at the base. The last part of the discai vein 



1 De Meijere says (Zool. Jahrbiich. Abtheil. fiir Anat. XIV, 1901, 443): "Bisweilen, 

 so bei Campsicnemus, ist das Sohlenlappchen breit." All the species I have 

 examined (especially scambus and curvipes) have a narrow, rather decidedly 

 comb-shaped empodium. 



