PL A.TYEHO PALOPSIS. 



467 



has an oval depression between the front of the eyes ; according 

 to Westwood the femora have a peculiar character on their inner 

 surface, consisting of a small group of ridges arranged in a radiat- 

 ing manner : these are probably sexual, and look like a stridulating 

 organ ; legs moderate, pitchy. 



Length 7-8^ millim. 



Bhutan; Penang. 



Genus PLATYRHOPALOPSIS. 



Plati/rJiojudopsis, Desneux, Gen. Insect. (Wytsman), Paussidae, 

 1905, p. 20. 



Platyrhopalus, Westwood (ex parte), Trans. Linn. Soc. Lond. xvi, 

 1838, p. 685. 



Form very broad, short, more or less convex and thick-set ; 

 head small, broader than long, very much narrower than the 

 pronotum ; eyes large and prominent, with the temples visible 

 behind, but occupying the greater part of the sides of the head ; 

 antennae two-jointed, with the first joint somewhat long and 

 extended beyond the insertion of the club, which is very large, 

 flat, and almost circular, slightly concave above, very slightly 

 convex below, and not emarginate and dentate at the base ; the 

 maxillae and maxillary palpi are much as in Platyrhopjalus, but 

 the labial palpi have the second joint longer in proportion ; 

 pronotum short, or very short, and broad, transversely elliptical ; 

 elytra very broad, broadly oblong or almost square, with the 

 shoulders rounded and not prominent ; legs very short, broad and 

 compressed, femora deeply furrowed underneath to receive the 

 tibiae ; tarsi short, with the last joint about as long as the others 

 together. 



The only genus that at all approaches this in form is Cerapterus, 

 which may at once be known by its 10-jointed and quite differently 

 shaped antennae ; it is very closely allied to Platyrhopalus, and the 

 chief difference appears to lie in the shape of the pronotum and 

 the general form. The characters given by Desneux with regard 

 to the second joint of the labial palpi and the shape of the antennae 

 are not worth much, as Platyrhopcdus varies somewhat in these 

 respects ; the strong femoral grooA^es, at first sight, appear to 

 offer a good distinction, but these are present, although to a less 

 degree, in Platyrhopatus. The discovery of a somewhat inter- 

 mediate species, described below, complicates matters, but it must, 

 I think, be certainly referred to this genus. 



Key to the Species. 



1. Form shorter and more convex ; elytra 

 imicolorous. 

 i. Pronotum with the sides broadly an- 

 gulated ; margin of antenna! club 



notched mdlyl, Westw., p. 468. 



2h 2 



