3. RHADIURGUS 651 



two elongated dark spots Avhich almost extend to the hindmargin ; humeral 

 stripes short but distinct. Pubescence short and black, slightly longer after 

 the suture when mixed with the long bristles (especially towards the hind- 

 margin) but even then only about half as long as the bristles ; a little thin- 

 haired whitish i^ubescence occurs all along the sides from the humeri over 

 the postalar calli and also along the hindmargin. Bristles black ; two strong 

 pr^sutural with sometimes an additional small one in advance • two strong 

 supra-alar and sometimes one weak one lower down • one very strong post- 

 alar, or two with the upper one weak, or even three with the third one weak ; 

 about five (4-6) dorso-central postsutural (of which the two or three hindmost 

 may be rather weak) and one or two pntsutural quite near the suture but 

 with no sign of others as the dorso-central rows then cease abruptly anteriorly. 

 Pleurae covered with ashy grey dust, sometimes rather brownish on the upper 

 part of the mesopleurse ; prothorax and the space under it clothed with long 

 not dense whitish pubescence ; mesopleurse with slight short whitish but 

 inconspicuous pubescence along the top part, while similar pubescence occurs 

 on the ui:)per part of the sternopleuree and on the pteropleurse ; metapleurse 

 with scarcely any pubescence except the fan of about four (4-6) rather strong 

 and about four weak hair-like bristles of which the strong ones may be all 

 black or only the middle ones l:)]ack and the rest yellow ■ hypopleurge with 

 one sti'ong black bristle at the top of a fan-like row of about three weak 

 yellow ones. Scutellum ashy grey, bearing rather abundant not short though 

 not very conspicuous soft whitish pubescence (though sometimes a few of the 

 hairs near the base are black) which is rather sloped forwards and with two 

 or three or four rather strong upturned black marginal bristles ; metanotum 

 rather dusted whitish but almost shining black on the middle, with the side 

 humps covered with whitish grey tomentum and with a little blackish 

 pubescence on their lower part. 



Abdomen black, slightly shining, but with grey hindmargins of segments ; 

 when viewed from in front it has a blackish or brownish black appearance 

 with distinct light grey bare hindmarginal hems. Pubescence short depressed 

 and black on the middle of the disc, but pale down the sides and with the pale 

 hairs extending somewhat on to the disc near the hind corners of the segments ; 

 the short black pubescence scarcely forms fringes against the bare hind- 

 margins, but the basal segment bears longer, more erect, and more conspicuous 

 pubescence which is bent over the hindmargin like a fringe, while about two 

 (0-3) of the hairs near the sides of the hindmargin may form bristles, though 

 none of the subsequent segments show any trace of side-bristles. Belly 

 blackish grey, bearing delicate rather long pale pubescence on the three basal 

 segments and some shorter more depressed pale pubescence on the fourth 

 segment, but on the remaining segments the pubescence is short, depressed, 

 black, and bristly except for inconspicuous pale fringes on the hindmargins ; 

 eighth segment short, and of the same colour as the seventh, with a straight 

 but slightly dropped hindmargin. Genitalia long but not large, shining black ; 

 claspers (when seen sideways) appearing long but narrow and somewhat bent 

 downwards at the blunt end, but when seen from above the inner margin of 

 each clasper has a very large dentation so that a short sharp tooth stands out 

 and nearly divides the opening between the claspers into a long ovate basal 

 open space with broad margins which slope down inwards and a large 

 a most circular end opening (when the long sickle-shaped points of the 

 claspers just touch), and this end circular space is much broader than, though 

 not so long as, the oval basal space ; lower lamellae moderately broad at 

 the base but soon narrowing into a rather long bare prong which has a 

 ferruginous tip ; these under lamellae have a few long black bristly hairs 

 on their underside ; the claspers have (usually) black pubescence at their 

 base and on their outer side but whitish pubescence on the inside and about 

 the tip ; the middle prong of the penis is thread-like and exceedingly long. 



Legs black, with the tibiie and tarsi partly dull dark red ; front coxae 

 covered with gi'eyish white dust and bearing anteriorly rather abundant 

 drooping long w^hitish pubescence ; posterior coxae less grey and bearing less 

 abundant pale pubescence ; front tibicB usually brownish red at just the base, 

 but often inconspicuously so ; posterior tibiae dull red, with only the tip 

 rather indeterminately black ; all tarsi with the basal joint dull red except at 



