34 Orthonhapha brachycera. 



margin of the segments there are black, bristly hairs. Venter some- 

 what greyish, with pale hairs. Hypopygium rather small, blackish 

 grey at the basal part, the appendages yellow; it is constructed al- 

 most as in Wiedemanni, but is relatively shorter, and there is no 



distinct middle ventral lobe; the 

 posterior ventral lobes styliform 

 and curved towards each other, 

 black at the apex; at the base of 

 each lobe are two hairs, placed on 

 a peduncle; the outer lamellæ are 

 united and bear long, black hairs 

 at the apex; the basal part of the 

 inner lamellæ is not formed as in 



Fig. 8. Hypopygium of S. longulus. Wiedemanni, but is simple and 



straight, the styliform apices pro- 

 ject beyond the outer lamellæ in such a way, that it looks as if they 

 were prolongations of this. Legs yellow, posterior coxæ grey, the 

 hind pair a little yellowish behind, tarsi dark brown or blackish. 

 Front metatarsi as long and middle metatarsi almost as long as the 

 four following joints, hind metatarsi very slightly longer than the 

 second joint. On the middle tarsi the first, second and third joints 

 are a little dilated at the end. The front coxæ have a row of spine- 

 hke, yellow bristles at the anterior side, the middle coxæ have some 

 yellow hairs, and the hind coxæ a yellow bristle on the outer side. 

 The front femora have five yellow bristles below; for the rest the 

 legs have short, brownish or blackish hairs, and they are almost bristle- 

 less; the middle femora bare below; of bristles there are only some 

 small ones on the front tibiæ above, and a row above on the hind 

 tibiæ, further a preapical bristle on the hind femora, and a bristle 

 near the base on the anterior side of the middle tibiæ; the apical 

 bristles on the tibiæ small; the hairs on the middle tibiæ are erect. 

 Wings hyaline or a little greyish; veins blackish, the lower branch of 

 the discai fork somewhat faint; the posterior cross-vein about as long 

 as the discai vein to the fork, and shorter than the last part of the 

 postical vein. Squamulæ yellow, with a yellow fringe. Halteres yellow. 

 Female. Epistoma not broader than in the male. The acrostichal 

 bristles few and generally only present anteriorly. Hind coxæ yellow; 

 the front femora seem always to have only four bristles below; the 

 legs are more bristly than in the male, as there are more and longer 

 bristles on the tibiæ, and also the hind tibiæ have a bristle near the 

 base on the anterior side. The upper branch of the discai fork more 

 rectangularly curved (though varying in this respect). 



