4. ATRICHOPS 293 



black bristly hairs all over ; the dorsal plate ends in a truncate luteous 

 margin which has two small luteous lamellae spreading out like short lateral 

 horns ; when seen sideways this dorsal plate curves up to the luteous hind- 

 margin, and a pair of rather large thick short lower lamellae extend almost 

 as far as the tip of the dorsal plate, and these lower lamellae also have each 

 a_ short thick end-joint and bear black bristly pubescence, but the luteous 

 hindmargin of the dorsal plate is bare. 



Legs long and rnainly yellow : front coxse long, yellow, and with very 

 little pubescence which consists oi a few rather long thin jmle hairs ; front 

 trochanters with a blackish spot beneath at their junction with the femora ; 

 posterior coxa3 a little obscured in front at the base : posterior trochanters 

 all obscured ; hind femora with the apical two-thirds blackish and rather 

 dilated ;_ hind tibiiE brown and further obscured by the abundant minute 

 black bristles, often appearing paler at the base but growing brown at the 

 tip, slightly dilated and bearing a neat rather short dorsal ciliation ; hind 

 tarsi nearly as long as the tibiae, with the basal joint considerably dilated 

 and longer than the other four joints together and bearing about six short 

 dorsal bristles sloped away from the base, and with the second joint also 

 about as much dilated ; front tibiae and tarsi with abundant suberect short 

 delicate pale pubescence, and the front tarsi with " touch-hairs " beneath 

 all the joints • front tarsi one and a half times as long as the tibiae, with the 

 joints very thin and gradually decreasing in length ; anterior tarsi becoming 

 obscure soon after the base, and the hind tarsi api)arently all darkened 

 but really the two basal joints brown like the tibiae but obscured by 

 abundant tiny black bristles; any pubescence on the femora is very 

 slight and pale. Pulvilli dull yellowish, posterior claws very short, but on 

 the front legs the middle pulvillus is large and rounded while the outer 

 pul villus and claw are distorted as in Atherix (fig. 190). 



Wings (fig. 194) slightly smoky ; stigma conspicuously large and blackish, 



Fio. 194. — Atrichops crasstpes <J. x 10. 



occupying all the marginal cell from the origin of the cubital vein to its end 

 and widening as the cell widens but leaving the exact margin of the radial 

 vein not darkened ; a rather faint cloud extends from the stigma downwards 

 over the cross-veins, and the apical quarter of the wing as well as a good 

 deal of the hindmargin are faintly clouded, and this clouding becomes more 

 obvious on the downward curve of the postical vein ; base of the wing very 

 pale yellow and the basal part of the subcostal vein also yellow ; subcostal 

 vein bearing abundant minute bristles. Venation as given in the generic 

 characters ; small cross-vein as long as the basal part of the upper branch of 

 the postical vein and consequently the lower basal cell widened. Squamae 

 (alar) whitish yellow with a blackish spot on the upper part ; margin thin 

 and yellow and with a very slight though not short pale fringe which is in a 

 single row. Halteres yellow, but with nearly all the knob conspicuously blackish. 



Frons occupying nearly one-third the width of the head and contracting very 

 slightly from the vertex to the antennae, dusted light ashy grey on a blackish 

 ground colour and in some lights this ground colour shows up more blackish 

 on the depressed middle part (but not near the antennae); pubescence 

 obviously pale though sparse, long from the level of the front ocellus to 

 the suture before the antenuc^, and on each side not far from the eyes four 

 or five of these pale hairs form a fairly conspicuous row sloping forwards and 

 outwards ; there is a slight middle channel running down from the front 

 ocellus to between the antennae, crossing the slight transverse suture a little 

 before the antennae and becoming much narrower and more sharply defined 

 on this last piece between that suture and the antennae ; ocellar space raised 



