SARCOPTIDM 



731 



Histiogaster Berlese, 1883 — H. spermaticus Trouessart, 1900. — This mite, 

 which feeds on vegetables, appears to have been introduced into a patient by 

 means of a catheter, and to have formed a cyst in the testis in a man in India. 



Carpoglyphus Robin, 1869. — C. alienus Banks has been found in purulent 

 urine passed by a man. Probably it was a contamination. 



Family 2 : SARCOPXiDyE. 



Sarcoptoidea without genital suckers, without clinging apparatus, with 

 transverse vulva. Lines in skin. 



Sarcoptes Latreille, 1806. — Sarcoptidae with round or slightly oval bodies; 

 posterior two pairs of legs concealed beneath the|.body; tarsi end in simple 

 long pedicles with ambulatory suckers. 



Sareoptes scabiei var. hominis Lin- 

 naeus, 1758. — Female lives in furrows 

 in the epidermis, in which it lays its 

 eggs. Posterior legs end in spines. 

 Males occur on the surface and die 

 after copulation. Posterior legs end 

 in suckers. Six-legged larva hatches in 

 four to eight days. 



Sarcoptes minor Furstenberg, 1861. 

 — Usually a parasite of cats; has been 

 found on man. 



SarcoptidsB as Internal Parasites. — 

 Sarcoptidae have been described by 

 Newstead and Todd as internal para- 

 sites in monkeys. An Acarid-like 

 parasite was found by Castellani in the 

 omentum of a negro in Uganda. This 

 parasite somewhat resembled Cyto- 

 leichus sarcoptoides Heguin, which 

 lives in the air sacs, and at times the Fig. 350. — Sarcoptes scabiei var. 

 liver and kidneys, of fowls. hominis Linnaeus, 1758: Male. 



Notoedres Railliet, 1893 — N. cati (x 125.) 

 Railliet, 1893. — Cause of the itch in 

 the cat, and transmissible to man. 



Gytoleichus sarcoptoides Megnin. — Synonym, Cytodites nudus (Vizioli, 

 1868), in fowls in the Sudan. 



Gytoleichus hominis Hirst, 191 7. — Found by 

 Castellani, in 1902, embedded in the fat of the 

 omentum of a negro in Uganda. 



Ghorioptes bovis Gerlach and Psoroptes equi 

 Gervais are stated by Ziirn and Hirst to attack 

 man. 



SUBORDER VI. VERMIFORMIA. 



Very minute Acarina, with abdomen elongated 

 and annulated, without tracheae, and with epimeres 

 on the legs. 



This suborder contains only one family. 



Family Demodicid^. 



Vermiformia with eight legs, living on animals. 

 This family includes only one genus — Demodex Owen, 1843. 



Demodex Owen, 1843. 



With the family characters. This genus has been recently revised by Hirst. 

 The species of Demodex live in the sebaceous glands and hair-follicles of 

 mammals and man. The mouth consists of a rostrum, which is arranged for 



Fig. 351. — Gytoleichus 

 hominis Hirst, 19 17. 



