200 REPORT ON ZOOLOGY, MDCCCXLIII. 



is, as far as can be perceived, four-eyed, with a couical or acicular free 

 proboscis, free palpi inserted at the sides of the head, and moveable 

 laterally ; it contains the genera Bddla, Latr., Ammonia, K., Seines, Her- 

 mann, Eupalus, K., Cheyletus, Latr. The third family : GAMASIDES, (epizoic 

 Acari), without visible eyes, with the oral organs moveable forwards and 

 backwards on a tube, free and distinctly jointed, fusiform palpi ; living 

 on animals, and also in garden mould ; it includes the genera Dermanyssus, 

 Dug., Gamasus, Latr., Lfelaps, K., Zercon, K., Sejus, K., Notaspis, Henn., 

 Humans, K., (formerly IpJiis, K.) The fourth family : CAHABODIDES, 

 (colcopteroid Acari) beetle-formed, with distinctly separated cephalo- 

 thorax, and with concealed, seldom projecting palpi, living on the earth 

 or on plants ; it consists of the genera Oribates, Latr., Zetes, K., Efemaus, 

 K., Pelops, K., Ceplieus, K., Oppia, K., Damceus, K., Carabodes, K., Celtsno, 

 K., Hypoctlwnius, K., Nothrus, K., Murcia, K., Hoplophora, K. The fifth 

 family, lastly : the SARCOPTIDES (pedicular Acari), with an entirely concealed 

 suctorial proboscis, and palpi, in part, or almost wholly concealed, mostly 

 very unequal legs, with and without ungual vesicles ; it includes the genera 

 Acarus, L., Homopus, K., Sarcoptcs, Latr., Derm-aleichus, K., Pteroptus, Duf., 

 Uropoda, Latr., Hi/popus, Dug. Excepting the first, all the genera of this 

 family inhabit animals. 



Denny (Ann. Nat. Hist, xii, p. 312, pi. 17) has published some new 

 species of Ixocles, viz., I. bimaciilatus (female of the following), /. Mppopota- 

 mensis, from the Hippopotamus in South Africa. /. rldnocerinus, from the 

 Rhinoceros bicoruis, do. /. Hydrosauri, from Hydrosaums. Gouldii? from 

 Van Diemen's Land. 



The cutaneous Mite discovered by Simon has also been found in England. 

 Wilson is about to publish a special memoir upon it in the ' Philosophical 

 Transactions,' with the view of affording a more precise exposition of its inter- 

 nal structure, together also with information about the ova and development. 

 He calls the animalcule Eiihzoonfolliculonim, (Ann. Nat. Hist, xii, p. 222.) 

 In the mean time, also, Owen had proposed for it the name of Demodex. 

 Tulk exhibited at the Microscopical Society, in December, 1843, a similar 

 animalcule from the cutaneous pustules of a mangy dog, which appears to be 

 a second species. (Ann. Nat. Hist, xiii, p. 75.) Lastly, Gervais (Hist. Nat. 

 des Apteres, iii, p. 282), who gives an extract from Simon's description, 

 imposes on the genus the name Simonea, so that this Acarus has already 

 received not less than four generic names. Vide last year's Report, p. 278 

 (Transl. p. 268.) 



PYCNOGONLDES. 



Pliilippi has communicated in these Archives (1813, i, Bd. p. 175, t. 9) 

 his observations on the Neapolitan Pycnogouides, among which three new 

 species have afforded ground for the foundation of two new genera. 



