6 Platypezidae. 



of the head, touching for a long space, so that only a small frontal 

 triangle is left, in the female smaller and broadly separated. The 

 vertex is rather prominent in male; there is a pair of distinct ocellar 

 bristles, and in female some frontal bristles. Along the hinder eye- 

 margin a row of short postocular hairs. In the male the eye-facets 

 in more than the upper half of the eye are enlarged. The antennæ 

 inserted near to each other, at about middle of the head; the basal 

 joint is small, the second a little longer, the third still longer, some- 

 what elongated oval, bearing an apical arista a little longer than the 

 antenna, with an indistinct basal joint; the second antennal joint 



Fig. 1. Wing of O. nigra ^ . 



has some small apical bristles, the third joint a couple of bristles 

 above; the arista is short hairy. The cheeks are downwards passing 

 over into the jowls, which are almost not descending; on cheeks and 

 jowls there is a row of bristles. Epistoma is a little sunken between 

 the cheeks. The mouth parts I have not been able to examine. Thorax 

 quadratic, arched above; it is hairy and of bristles there are a humeral, 

 a posthumeral and a præsutural; further a couple of notopleural, a 

 supraalar and a postalar bristle; behind there are two rows of dorso- 

 central bristles, the hindmost long; besides there is a couple of 

 shorter, but erect and bristly hairs at the sides of the disc. Scutellum 

 with two long marginal bristles and two pairs of small, the one pair 

 apical. Pleura bare. Abdomen elongate, a little compressed; it con- 

 sists in male apparently of six segments, the sixth small, and behind 

 it the downwards bent hypopygium is seen, but I have not been 

 able to examine the segments more closely. Legs of simple shape, 

 only hind tibiæ shghtly dilated towards apex; the legs are short- 

 hairy, only front and especially hind femora with longer hairs; all 

 tibiæ with a small apical spur. Claws and pulvilU small. Wings with 

 alula almost not developed, but with a well developed axillary lobe, 

 both with somewhat long hairs at margin. The venation somewhat 



