Mr. H. Denny on Six new species of Parasites. 313 



spots on tlie abdomen, together with the legs of his species being 

 a dull brown, while those of the above differ so materially on this 

 point, I consider myself justified in characterizing it as a new 

 species. 



2. Ixodes Hippo potamensis {Deimy). Subovatus, subconvexus, pal- 

 lida stramineus, Isevis, cum lineis nigris, submarmoratis seu re- 

 ticulatis ; pedibus flavo-albis, interne bepaticis. — Long. 3 lin, 

 PL XVII. fig. 2. 



Hab. Hippopotamus amphibius, South Africa. 



Subovate and rather convex, pale straw-yellow, smooth, with a 

 few scattered impressed punctures. Thorax indistinctly defined^ 

 with a bifurcated black line on each side, extending from the in- 

 sertion of the occiput to the posterior margin, where they become 

 nearly united. Abdomen reticulated by a number of black mark- 

 ings, which form a series of irregular blotches round the lateral 

 margin, and one large patch in the centre. Legs paler than the 

 body, thick, strong and hairy; the inferior margin obscurely 

 toothed; under surface deep liver-red. 



Communicated by A. Melly, Esq. 



3. Ixodes Rhinocerinus (Denny). Ovatus, subconvexus, cum punc- 

 turis aliquot magnis ; nigris, Isevibus, et maculis multis, magnis, 

 aurantiacis ; pedibus aurantiacis, cum annuHs obscure rufis, super- 

 ficie interna irregulariter dentata. — Long. 3 j lin. PI. XVII. fig. 3. 

 Hab. Rhinoceros bicornis. South Africa. 



Ovate, somewhat convex, black and smooth, with a few large 

 punctures scattered over the surface. Head and palpi orange-yel- 

 low, the former darker at the occiput. Thorax obscurely defined^ 

 subcordate, with a broad interrupted orange margin. Abdomen 

 with six large irregular orange blotches in the centre, and a series 

 of smaller ones round the lateral margin, divided by eleven im- 

 pressed lines posteriorly, and united by a semicircular transverse 

 one. Legs orange-yellow, thick and strong, the last joint and the 

 basal portion of the remainder with a deep red annulus ; the in- 

 ferior margin acutely but irregularly toothed and armed with stiff 

 hairs. 



Communicated by A. Melly, Esq. 



DeGeer describes and figures an Ixodes from the Rhinoceros 

 [Acarus Rhinocerotis) , which in certain points resembles the above 

 so nearly, that I felt some doubts as to whether they might not be 

 the same species at different ages, or extreme varieties. But he 

 says, " Subrotundus, planus, fuscus, maculis testaceis fusco-punc- 

 tatis." Again, " Les huit pattes sont du meme bran obscure que 

 le corps" Now in the first place our insect is not fuscous, but 

 black ; and secondly, the feet are not of the same colour as the 



