Platychirus. 209 



yellow "or sometimes black hairs ; it is rather flat, the central knob 

 slightly prominent. Occiput yellowish or greyish yellow pruinose, with 

 yellow hairs, among which are no black. Antennæ black, not small, 

 third joint somewhat broad, almost square; arista about as long as 

 the antennæ. Thorax æneous, shining, clothed with not long, yellow 

 hairs, longest on scutellum. Abdomen dull black, a little shining at 

 the very base and apex; it has three pairs of large, yellow or reddish 

 yellow spots; the first pair placed on the middle of the segment, its 

 inner margin slopes outwards towards the base so that the spot is 

 somewhat triangular, the second and third pairs are placed towards 

 the front margin and are rectangular; the spots leave only a narrow 

 middle line and transverse lines at the hind margins black ; the fifth 

 segment has large spots at the basal corners. Abdomen is clothed 

 with yellow hairs, long at the sides towards the base; on the middle 

 line and partly on the transverse lines are black hairs. Venter some- 

 what translucent, yellowish, generally darker towards the end, with 

 long, yellow hairs, short on fourth segment. Anterior legs yellow, 

 only front femora a little obscured behind and middle femora with a 

 brown spot below^ at base; hind legs black with base and apex of 

 femora and tibiæ yellow, or they may be termed yellow with broad, 

 black rings on femora and tibiæ ; hind tarsi black with the apical part 

 of the three first joints yellow, or the middle joints all yellow and 

 the two apical joints slightly darkened. Front trochanters with in- 

 conspicuous, dark yellow or brown spines below; front femora with 

 a row of isolated, long, black bristles behind, and below them with 

 yellow hairs, but quite below with some black or yellow bristly hairs; 

 there is no peculiar white hair at the base; front tibiæ thin at the 

 base but then evenly dilated, the posterior apical corner drawn some- 

 what out and in the middle of the posterior margin a slight incurva- 

 tion; they are somewhat whitish at the apex, and below on the 

 anterior part at the apex are some small, black lines and towards the 

 posterior side a dark longitudinal stripe; they have short, pale hairs, 

 only above the incurvation at the posterior margin are generally darker 

 to black hairs; the front tarsi are moderately dilated and evenly de- 

 creasing towards the end but with all joints dilated; metatarsus about 

 of the length of the two following joints, it has two dark longitudinal 

 markings below, and a black line stretches down the middle of second 

 and third to the base of fourth joint. Middle trochanters with short, 

 black spines at the apex; middle femora with short, black bristles on 

 *the anterior side towards below, stopping before the apex ; below the 

 apex one to three of the curious, recurved hairs, on the ventral side 

 about the middle a row of four or five long, black, bristly hairs, the 



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