196 Mr. T. Vernon Wollaston on the 



anomalous members of the family which have hitherto been de- 

 tected,— the remarkable (apically-excavated) terminal joint of 

 their labial palpi and exceedingly blunt, obliquely truncated, 

 edendate mandibles, in conjunction with their obsolete scutellum, 

 and large, polished, apterous bodies (which in most of the repre- 

 sentatives are sparingly studded with long erect hairs on the 

 elytra, and with stronger and denser setEe at the shoulders), 

 giving them a character quite their own. The hinder region of 

 their prothorax (which is gradually narrowed) and the base of 

 their elytra are embossed with more or less distinct noduliform 

 ridges (clothed with either setse or scales) ; their metasternum is 

 short, and circularly scooped-out between the posterior coxae ; and 

 the first joint of their hinder male-feet (a structure, however, 

 which exists in another of the Canarian genera, Pwtes) is more or 

 less expanded, or enlarged. In the proportions of its maxillae, 

 mentum, ligula and upper-lip [^uide the Plate], Casapus does not 

 differ appreciably from the normal members of the Ptinidce. 



§ I. Elytra setts rigidis erectis phis minus obsita. Palporum 

 lahialium arliculus ultimus apice profunde excavatus. 



1. Casapus Bonvoidoirii, n. sp. (PI. VIII. fig. 1.) 



C. niger, obsoletissime subaenescens et (oculo valde armato) 

 alutaceus ; prothorace subpicescenti, angustulo (antice vix 

 dilatato), valde et subsequaliter 4--nodoso-costato, dense (prae- 

 sertim in nodis et ad basin) fulvo-squamoso ; elytris ellipticis, 

 basi truncatis apice acuminatis, leviter striato-punctatis, pilis 

 perpaucis elongatis versus apicem et setis densioribus ad 

 basin (praesertim ad humeros) obsitis, costis 4 basalibus 

 (postice evanescentibus) maximis elevatis, fasciis duabus 

 [sc. antemedia saepius obsoleta, et postmedia distinctiore 

 dentata] albido-ornatis ; antennis pedibusque elongatis, ro- 

 bustis, rufo-ferrugineis, squamosis. 

 Long. corp. lin. ]| — 2. 



Habitat in sylvaticis editioribus TenerifFse, sub lapidibus, hinc 

 inde baud infrequens. Species valde indigena distincta formosa 

 et in honorem amici mei Dom. H. De Bonvouloir, Parisiis, auctoris 

 Monographiae Throscidum accuratissimae felicissimi a meipso dicata. 

 This large and beautiful Casapus maybe known from the other 

 species here described by its greatly (and subequally) 4-nodose- 

 costate prothorax, and by its very lightly striate-punctate, ellip- 

 tical, and apically-acuminated elytra (the widest part of which is 

 a little be/ore the middle). Its elytra, also, are much less densely 



