852 Insects. 



White and Doubleday, of the British Museum, that all the specimens standing as 

 Odontonyx in the cabinets with which they are acquainted, appear to be only small 

 specimens of Olisthopus, and have no perceptible denticulations ; in my insect, the 

 thorax is wider at the base than in Olisthopus, and the hinder angles much less 

 rounded ; the elytra, also, are wider and flatter, and less rounded at the tip ; and the 

 whole insect is darker in colour. There appeared almost an entomological interreg- 

 num in the islands, as my captures were not numerous either in species or individuals, 

 and mostly immature specimens ; and I failed to secure any specimens of Remus 

 sericeus, which I discovered on my previous visit. I have no doubt that a visit to 

 the Isles during the season would amply repay an entomologist. — F. Holme ; C. C. C. 

 Oxford, December, 1844. 



Addendum to the ' Synonymy of the Perlites, by Edward Newman] 

 published in the Mag. Nat. Hist, for 1839. By Edward Newman. 



Sp. 1. Isogenus infuscatus. Newman. 



The antennae are about half as long as the body, rather slender, and 

 composed of sixty-eight joints, which are so short and so closely 

 compressed together, especially towards the base, that the sutures 

 separating them are only perceptible under a lens of high power : 

 the basal joint, which, in accordance with general structure, is much 

 larger and stouter than the rest, is black ; the remaining sixty-seven 

 joints appear of a dingy -brown colour, paler beneath. The head is 

 broad and flat, with very prominent lateral eyes, and three transpa- 

 rent ocelli : its colour is black, with a yellow patch on each side, sur- 

 rounding the base of the antenna, and extending along the anterior 

 margin of the eye. The prothorax is much narrower than the head ; 

 its transverse and longitudinal diameters nearly equal ; but its poste- 

 rior narrower than its anterior margin ; both are straight. All the 

 wings are opaque, and smoky-black, with the costal margin yellow : 

 in the fore-wings, this yellow margin, occupying the space between 

 the costal and subcostal nervure, is traversed by seventeen transverse 

 nervures, twelve of which, nearest the base, are nearly direct, five 

 towards the apex very oblique. The body is somewhat brown above, 

 and dingy-yellow beneath. All the legs have the coxae and the basal 

 portion (extending beyond the middle) of the femora yellow, the 

 apical portion of the femora black ; the protibiae are entirely black, 

 the meso- and meta-tibiae black at the extremities, and yellow in the 

 middle ; all the tarsi are black. The caudal setae are rather shorter 

 and rather stouter than the antennae, slightly hairy, and composed of 

 twenty-five joints ; those nearest the base are very short, and closely 

 united. The expansion of the wings is T7.3 inch. 



