Mr. Westwood on the Genus Ctenostomu. 53 



Art. XIII. Observations upon the Genus of Coleopterous 

 Insects, Ctenostoma of Klug, and its Species. By J. O. 

 Westwood, Esq., F.L.S.,Src. 



Order. Coleoptera. 



Fam. ClCINDELID^. 



Genus. Ctenostoma. Klug, Latr., Dej. 



Caris. Fischer. Collyris, p. Fabr. 



The principal generic characters of this group have been detailed b^ 

 Dejean, in his Species General, &c., Vol. I. p. 152, and by Klug in the 

 Berlin Transactions. The following observations principally suggested by 

 the possession of the sexes of one of the species may however be added. 



The upper lip (labrum) of the female is more advanced in front than 

 that of the male, and is furnished wdth a small tooth at each side, and 

 three in front, the centre one of which is almost obliterated in the 

 male. The figure of the upper lip of Ct. trinotatum, given by Fischer 

 in his Genera, Tab.l, f. 8, is very incorrect. 



Fischer and Latreille describe these insects as apterous, and Klug as 

 being furnished with moderate sized wings. Dejean {having only a sin- 

 gle specimen of each of the three species) states his unAvillingness to 

 sacrifice them to verify the fact. Without, however, injuring my speci- 

 mens, I have discovered that the the males are furnished with wings, 

 about two-thirds of the size of the elytra, unfolded, and with two diagonal 

 nerves, and that the wings of the female are not above half the size of 

 those of the male. 



The legs of the male are rather longer and larger than those of the 

 female. In both sexes the four posterior femora and tibiae are com- 

 pressed (especially the hinder pair), so that when seen sideways they 

 appear much stronger and thicker than when seen from above. The 

 anterior tarsi of the male have the first three joints dilated and thickly 

 clothed beneath with short hairs; the third joint being produced obliquely 

 and flatly on the inside. The tarsi of the female are quite simple. 

 In the Iconographie des Coleopteres d' Europe, 1. 1, f. 2, the penultimate 

 joint of the four posterior tarsi of Ct. trinotatum $ is represented bilobed. 

 Klug's figure of Ct, rugosum (which is drawn from a female) represents 



