222 MR. WESTWOOD ON THE TENEBRIONID^ 



large African species of these insects, that it will be found necessary to sink some of the 

 generic groups admitted in this paper. Our present knowledge does not, however, war- 

 rant our uniting the type of this group with any of the others. 



Calostega puRPURiPENNis. Spccics unica. 

 Tab. XV. Fig. 1. 

 Cal. nigra, suhopaca, Uevis ; elytris purpureis, sub lente tenuissime striato-punctatis. 

 Long. corp. hn. 17 ; lat. elytr. fere hn. 6. 

 Hab. in Ashantee. Mus. D. Hope. 



The general colour of the insect on the upper side is black, with a silky kind of gloss 

 produced by the subopake surface, in which, with a very high-powered lens, are to be 

 seen numerous minute shining punctures ; the clypeus is broad and elevated, being 

 separated from the vertex by a deep curved line, terminating in two deep lateral im- 

 pressions ; immediately behind each eye is a short deep impression, cutting the elevated 

 space in two. The antennae are black and shining, the terminal joints opake. The 

 prothorax is rather broadest in front ; the anterior angles are rather rounded off, behind 

 which the margins are serrated ; the posterior margin is more strongly margined than 

 the lateral one ; the disc is marked with two circular impressions towards the anterior 

 margin, and two less distinct ones towards the hinder angles. The elytra are smooth 

 and slightly shining, of a dark rich purple colour, and, with a strong lens, several rows 

 of very minute punctures are to be observed ; the humeral angles are rounded off ; the 

 legs are black and shining, as is the underside of the body. 



Nyctobates, Gu^rin. 



This genus has been characterized by M. Guerin (in the Magasin de Zoologie, 

 class ix. pi. 118.) simply by the exserted and rounded labrum, the antennae gradually 

 thickening to the tip, with the terminal joints very compressed, and the general form of 

 the insect, in all which respects it differs from the true Tenebriones. The T. gigas of 

 Fabricius is given as its type ; and in that South American insect, as well as in the 

 Indian species, N. tibialis, we find the legs greatly elongated, with the tibiae curved. As 

 these characters apply to the following species, I give them as species of the same 

 genus, although I think it probable that, upon a revision of the family, it will be neces- 

 sary to separate them, and probably N. tibialis, from the South American species. 



Nyctobates mcerens. 

 Tab. XV. Fig. 4. 



Nyct. niger, subnitidus ; capite thoraceque sub lente tenuissime punctatis, elytrisque tenuissime 

 striato-punctatis ; pedibus longis ; tibiis subincurvis ; thoracis angulis posticis acutis. 



Long. Corp. lin. 8^ ; lat. elytr. pone medium, lin. 3|. 



Hab. in Guinea. In mus. nostr. Commun. D. Raddon. 



