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



body ; and lastly, tlie very prominent character of the strongly 

 dentate inferior margin of the legs is not alluded to, which there- 

 fore appears to favour my supposition that the present species is 

 not the Rhinocerotis found by Sparrman at the Cape, but a distinct 

 and undescribed Ixodes also infesting the Rhinoce7'os bicornis. It 

 is however by no means improbable that the Rhinocerotis was ob- 

 tained from a different species of Rhinoceros, as at the period when 

 Sparrman visited Africa, and long afterwards, all the individuals 

 which might have been seen were confounded under the appel- 

 lation of Rhinoceros Africanus ; since which, owing to the disco- 

 veries of Burchell and Smith, two other well-marked species have 

 been found inhabiting the same continent, either of which might 

 have occurred to the Doctor while exploring the interior, and 

 supplied the specimen described by DeGeer. 



This and the two preceding species formed part of the collec- 

 tion obtained in South Africa for the Earl of Derby by Mr. Burke, 

 and which his lordship was kind enough to apprise me of under 

 an impression they were belonging to the peculiar family of 

 Parasites I am at present investigating. 



4. Ixodes Hydrosauri (Denny). Orbicularis, planus, subpubescens, 

 fuscus, thorace piceo ; pedibus hepaticis, cum albis annulis. — 

 Long. 3 lin. PL XVII. fig. 4. 

 Hah. Hydrosaurus Gouldii ? Van Diemen's Land. 



Orbicular and depressed, obscure, finely punctured and pubes- 

 cent. Head and palpi dull red. Haustellum ochraceous. Thorax 

 distinct, subtriangular, pitchy; the anterior margin pale red. 

 Abdomen flat, dull brown, with three or four dark, slightly sunk 

 blotches on each side; posterior margin somewhat crenate, with 

 a series of darker spots alternating with impressed lines. Legs 

 thick, liver-coloured, each joint, the last excepted, terminated by 

 a white band. 



Communicated by Mr. Gould. 



This species was obtained from one of the large lizards of Van 

 Diemen's Land, known to the colonists by the general name of 

 Guana (most probably the Hydrosaurus Gouldii of Mr. Gray), by 

 the above talented and zealous zoologist, and given to me on his 

 return from investigating the ornithology of Austraha. 



Class INSECTA. 

 Order Omaloptera. 

 Family HiPPOBOsciD-ffl;. 



Genus Lipoptena. 



5. Lipoptena Pteropi (Denny). Ochraceus, nitidus, pubescens ; 

 oculis maximis, cinereo-csesus ; thorace cum angulis lateralibus 



