34 Mr. G. R. Waterhouse on Coleopterous Insects 



lated ; the claw-joint of each tarsus is nearly equal in length 



to the four basal joints taken together. 



In general appearance, in the structure of the head and of the 

 tarsi, the species of this genus approach very nearly to the mem- 

 bers of Dejean's genus Blapstinus ; they have the legs however 

 rather longer, the thorax less distinctly transverse, and the elytra 

 more convex ; these are moreover soldered together, and there 

 are no wings as in Blapstinus. Judging from the definitions of 

 the various genera of Pedinida, the present genus presents a 

 combination of characters not hitherto noticed. Those genera of 

 the family of which I possess examples in my own collection I 

 find are capable of being distinguished from each other by the 

 following characters, which it will be observed are not peculiar to 

 either sex, and are therefore preferable, as it appears to me, to 

 those which have hitherto been pointed out, and which are chiefly 

 derived from the variations in the structure of the tarsi of the 

 male. 



I. Apterous ; elytra soldered together at the suture. 



A. Eye divided by the lateral ridge of the head. 



a. Anterior tibiae distinctly dilated at the apex. 



a *. Antennae short, submoniliform Heliophilus. 



a **. Antennae with the joints, most of them, 

 obconic. 

 0*1. Middle tibiae dilated at the apex . Pedinus. 

 0*2. Middletibiaenotdilatedattheapex Isocerus. 

 h. Anterior tibiae not dilated at the apex Pedonceces. 



B. Eye uncovered (not divided by the lateral ridge of the 



head), 

 a. Clypeus truncated or slightly rounded in front ... Platyscelis. 

 a*. Clypeus emarginated in front. 



a*\. Antennae distinctly incrassated at 



the apex Eurynotusf. 



a* 2. Antennae with the terminal joints 



oblong, not broader than the rest. Dendarus. 

 il. Winged ; elytra free. 



A. Eye divided by the lateral ridge of the head Blapstinus. 



B. Eye uncovered at the sides Opatrinus. 



f The mentum in Eurynotus is distinctly trilobed, having a central prin- 

 cipal portion and two lateral wings ; these wings or lateral lobes diverge as 

 they part from the base of the mentum and are acutely pointed at the ex- 

 tremity ; they are separated from the mesial lobe by a deep hollow on each 

 side. In the great Indian species, which Dejean arranges under the head 

 PlatynotuSy the same structure of mentum is observable as well as in Opa- 

 trinus ; but the lateral lobes do not exist in Heliophilus, or at least they are 

 here exceedingly minute and curved inwards, as I have observed to be the 

 case in the mentum of Blaps ; Dendarus appears to agree with Heliophilus 

 in this respect. Platynotus of Dejean must undoubtedly be placed near to 



