312 Mr. H. Denny on Sice new species of Parasites. 



XXXVIII. — Description of Six supposed new species of Parasites. 

 By Henry Denny, Corresponding Member of the Academy 

 of Natural Sciences of Philadelphia, &c. 



Amongst the Parasites collected by myself, or forwarded by sci- 

 entific friends to assist in my investigation of the Anoplura, seve- 

 ral specimens occurred which did not belong to the above class, 

 and therefore did not immediately claim my attention. Upon 

 examining these however subsequently, and suspecting that some 

 were undescribed and probably new to science, I felt that a short 

 notice of them was required at my hands. I therefore transmit 

 a brief description, with figures of six species, &c. for publication 

 in the ^ Annals of Natural History,^ under a conviction that should 

 any of them eventually prove recognized species, recent figures of 

 the same may not be wholly useless. These consist of four species 

 of Trachean Arachnida, one of the family Hippoboscida, and one 

 of the order Aphaniptera, which may be characterized thus : — 



Class ARACHNIDA. 



Order Tracheari^e. 



Tribe Acarides. 

 Genus Ixodes. 



1. Ixodes bimaculatus (Denny). Subovatus, depressus ; capite, thorace, 

 pedibusque pallida stramineis ; abdomine coccineo, ruguso, punc- 

 tate, cum maculis duabus magnis, suborbicularibus, aurantiacis, 

 eminentibus ; pedibus interne hepaticis. — Long. 4 hn. PI. XVII. 

 fig. 1. 



Hab. Hippopotamus amphibius. Southern Africa. 

 Subovate and depressed. Thorax and legs pale straw-colour 

 above, slightly pubescent with a few scattered black punctures. 

 Apex and lateral margin of the palpi dull crimson. Head with 

 two black subtriangular spots in the centre. Thorax very distinct, 

 subcordate, with two black, somewhat undulated, impressed longi- 

 tudinal lines from the anterior margin to the base, and an irre- 

 gular diagonal spot from the humeral portion of the lateral mar- 

 gin on each side» Abdomen dull crimson, rugose, punctured, 

 with seven obscurely defined longitudinal furrows, and two large, 

 nearly circular, slightly elevated orange-coloured spots, sinuated 

 on the inner margin. Legs thick and strong, the last joint and the 

 imder surface of the remainder clouded with deep liver-colour. 

 Communicated by A. Melly, Esq., of Liverpool. 

 DeGeer figures and describes a species of Ixodes {Acarus syl- 

 vaticiis) obtained at the Cape of Good Hope by Sparrman from a 

 land tortoise, which agrees with this in many respects as to co- 

 lour 3 but from his silence as regards the very characteristic orange 



