﻿M. Di: Laportf. first ilistinguihlied this geiuis from tl)e oilier 

 Ueduvii by its 5-jointe(J antenna?, and ocelli placed bij'orc the 

 eyes at the base of the rostrum ; but after a revision of his 

 Essay, he remodelled his synojitic table and gave the following 

 characters: " Anterior thighs dilated in the middle : antenuic 

 with not more than .) joints: anteiior thighs without spines: 

 eyes onlinary : 2nd joint of antenna." not sensibly thicker than 

 the last : transverse channel of thorax placed behind : heine- 

 lytra short." As it is evident that the ocelli are placed bc- 

 twccJi the eyes, and that the anterior thighs are spiny, the above 

 definitions are defective. Not having studied the exotic lle- 

 tluvii sufliciently, I am unable to give proper essential cha- 

 racters to this group; but Prostennna appears to be distin- 

 guished from die other British genera by the length of the 

 basal, and the shortness of the 2nd joints of tlie antenna^, by 

 the spiny anterior thighs and the peculiar form of the anterior 

 tibiie, wliich are furnished with a large flesiiy sucker at the 

 apex, adapted to prehension. There may possibly be mi- 

 nute annulets at the base of the 2 terminal joints of the an- 

 tennae, but for want of a specimen to dissect I have not been 

 able to determine that point. 



This beautiful insect was discovered last September on the 

 sand hills near Sandwich, by my friend Mr. A. Kennedy, 

 who very kindly presented me with his only sjiecimen. Mons. 

 Dufour at first consiilereil this to be an inidcscribetl species, 

 but he now agrees with the Count de Castelnau in thinking it 

 is an apterous example of 11. Grtttula, Fab. Latreille says it 

 is found in the neighbourhood of Paris, sometimes in houses 

 (l)rought in possibly with the fuel), and that it is rarely found 

 winjfed. M. Dufour has taken it not uncommonlv in the 

 environs of Saint Sever as well as in Spain, under stones or 

 knots of dry jjlants. 



In a recent number we described an insect (Hydroessa 

 pygma^a) found by the same distinguished naturalist in the 

 South of France, which was soon after delected in tlie north 

 of Ireland by Mr. lialiday, and we now have before us another 

 instance of the insects of the south finding their way in dry 

 seasons to our country ; and, on the other liand, in our prece- 

 ding plate (683.) is an example of a northern insect attracted 

 to the south. Noctua Sulidu^inis is well known as an inhabit- 

 ant of Lapland and Sweden, but was never detected in En- 

 ghuid until lately. Such liicts are interesting, anil ought, 1 

 think, to be recorded, intimately connected as they are with 

 the geography of animals. 



The Plant is Lepidium latifuUuin, Broad-leaved Dittander, 

 which I fi)und last Au<;ust near Sandwich, by tlie road lead- 

 in<f to the Sand-hills. 



