302 LEPTIDiE 



A deep black fly, easily known by its golden pile when in 

 good condition. 



(^ . Head conspicuously large, wider than the thorax, Epistoma strongly socketed 

 and quite bare, but covered with brownish dust ; the very broad side-cheeks 

 light grey and appearing to be bare, but with some slight short hairs on the 

 side of the deep channels between them and the epistoma ; these channels curve 

 towards eacli other and enclose the epistoma on the upper part, but widen 

 out about the mouth and make the side-cheeks narrower there though still 

 rather broad ; the side-cheeks continue without any interruption on to the 

 jowls, but the jowls widen out again and are blackish grey with I'ather stiff 

 dense longish black or blackish grey pubescence ; there are numerous yellowish 

 hairs right behind the mouth opening ; the light grey lower part of the back 

 of the head moderately inflated but dying out just above the middle of the 

 head, and on this inflated part the absolute eyemargin is bare, but above the 

 middle the back of the head is almost flush with the eyes and bears no fringe 

 of overhanging hairs or row of small bristles close against the eyes ; vertex 

 dull black, considerably elevated, and bearing numerous short black hairs ; 

 frons quite bare, grey near the antennae, but velvety black on the upper 

 point which runs so far up between the eyes that the latter 

 only actually touch for about a third of the distance between 

 the occiput and the antennae ; the side-cheeks when viewed 

 from above sink steeply below the level of the eyes but the 

 rounded prominence of the epistoma projects out very con- 

 siderably, and the palpi and proboscis project farther still. 

 Proboscis dull black, almost perpendicular, and with very 

 slight pubescence, almost as long and as prominent as the 

 palpi ; palpi long, thin, rather upturned but not curved, 

 black or greyish black, and clothed with numerous con- 

 spicuous rather long black hairs. Eyes (in death) reddish 

 brown ; facets on the larger upper part much larger than 

 Fig iQo —ca, ■ ^ ri ^^^^^ ^^"^ ^^^® Smaller lower part, and the dividing line so 

 cristaius s'^^^x'l'zf strougly marked that there is a perceptible depression caused 

 by the less prominence of the lower facets, but the small 

 facets extend somewhat upwards on the back margin and the change in size 

 is only gradual there. Antennae (fig. 199) brownish or greyish black ; all 

 three joints about equal in length, and the two basal joints bearing micro- 

 scopical black bristles ; third joint minutely pubescent, almost onion-shaped 

 with a slight apical point from which the arista projects ; arista long and 

 thin, but tapering and microscopically pubescent, about two and a half times 

 as long as the antennae. 



Thorax dull velvety black, slightly shining about the sides and especially 

 between the wing-base and the scutellum ; postalar calli usually a little 

 brownish • two faint rather broad greyish black stripes (sometimes difficult 

 to detect) run clown the disc from the front part to beyond the middle, 

 and between them is a narrow middle velvety black line ; pleurae and the space 

 behind the humeri dull greyish black. Pubescence on the disc composed 

 of fairly long suberect scattered thin black hairs, intermingled with which 

 are numerous more recumbent shorter scattered almost golden hairs which 

 are easily rubbed off, as in fact is the whole of the pubescence ; on the pleurae 

 there is almost bushy brownish yellow pubescence towards the top front part 

 and a line of similar pubescence extends down the back part of the mesopleurae, 

 but this pleural pubescence is composed of longish thin almost shaggy hairs ; 

 the rest of the mesopleurae is bare, but the sternopleurae have some very 

 slight pale pubescence on the upper part and some black hairs on quite the 

 lower part, while the prothorax bears dull yellowish pubescence ; meta- 

 pleurae with dull yellowish pubescence on the front part, and ■\\dth a 

 conspicuous dense radiating tuft of curved orange hairs on the hind part, 

 and these hairs curve up almost under the alar S(iuamae to above the level 

 of the root of the wing, while besides these tufts there is another one on the 

 hump on each side of the metanotum which though large and dense is not 

 so long-haired. Scutellum black, rather shining ; pubescence composed of 



