﻿'94 Annals of the South African Museum. 



with dense grey dust ; on the back are 4 blackish, longitudinal, dull 

 stripes, 2 of which on the middle more narrow, approximate and 

 abbreviate lieliind, and 2 broader and abbreviate in front, one on each 

 side. The hairs on back and pleurae are long, soft, whitish. Scutellum 

 like the back, with no distinct bristles. Squamulae whitish-pellucid, 

 with white marginal hairs ; haltères yellowish, Avith the knob infuscated 

 above. Abdomen like the thorax and likewise clothed with long whitish 

 hairs, devoid of bristles; genitalia black, grey dusted. Legs quite 

 black, the knees only being narrowly yellow ; fore femora with long 

 white hairs; hind tibiae with short, but distinct black spicules. Wings 

 whitish hyaline, quite unspotted, only the subcostal cell and the stigma 

 being dark yellowish ; veins yellowish on the basal half, black on the 

 rest ; cubital fork narrow and elongate, with the upper branch gently 

 curved at base and originating at an acute angle ; middle cross-vein 

 placed beyond the middle of the ol:)tuse discoidal cell, with a faint 

 greyish shading in the middle; first posterior cell broadly open, only a 

 little narrower than the 2nd following ones, which are of equal width 

 at end ; anal cell closed and shortly stalked. 



PSEUDEMPIS, gen. nov. 



Allied to Apatomyza ; and in the same way that this last genus 

 recalls a Therevid, thus the present one strongly resembles an Empis, 

 hence the name. It is founded on Amlctus heteropterus of Wiedemann, 

 a species which is very diiferent from Thlipsomyza heterojjte^-a of 

 Macquart, Avhich is now placed in Amictus ; on this last species 

 Rondani in 1863 has founded its genus Thlypsogaster, which has 

 nothing to do with Amictus heteropterns, Wied., or as mistaken by 

 WilHston in Psyche, 1899. 



The characters of the new genus are as follows : Head rounded, small, 

 narrower than the thorax; occiput developed, inflated, without fringe 

 at the eye's border. Ocelli of greater size, placed on a rovmded 

 prominent tubercle and disposed in an equilateral triangle. Eyes 

 bare, not indented behind, comparatively small, with equally small 

 areolets in both sexes ; in the male they are separated, but the frons 

 between them is narrower than the ocellar tubercle ; in the female the 

 frons is broadening, measuring at vertex one-fifth, and before the 

 antennae one-third, of the breadth of head. Face short, pei'pendicular, 

 not prominent, bai'e. Antennae inserted above the middle of the eyes, 

 and horizontally porrect; first joint long, rather thickened, haired; 

 third joint much smaller, linear, as long as or a little shorter than the 

 first two joints together, acute at end, with a thick terminal style. 



