440 



ARACHNIDA 



Fig. 692 



Paoroptes ovis 

 female (Banks). 



young female on being fertilized starts a burrow and thus a host 

 becomes infested in patches. About 100 species, 13 species being 

 American. 



1. SARCOPTES Latreille. The first two pairs of legs end with 

 stalked suckers and in the male the fourth pair also; the others end 

 each with a long bristle ; mandibles chelate : in mammals, 

 burrowing in the skin; about 14 species, 6 American. 

 S. scabiei (DeGeer) (S. hominis Hering). Itch mite 

 (Fig. 691). Length of female .45 mm.; width .35 mm.; 

 male half as large; egg .14 mm. long: causes itch in 

 man and mange in hogs. 



S. canis Gerlach. Mange mite. Length of female 

 .48 mm.; width .35 mm.; egg .17 mm. long: causes 

 mange in dogs, also in man. 



S. cati Hering. Mange mite. Length of female 

 .25 mm.; width .2 mm.; egg .1 mm. long: causes mange 

 in cats. 



2. PSOROPTES Gervais. Mandibles adapted for 



piercing and not burrowing; stalks of leg suckers jointed: on the 

 surface of the skin of mammals, where they suck blood; 5 species. 



P. ovis Hering. Scab mite (Fig. 692). Length of 

 female .60 mm.; width .40 mm.; egg .2 mm. long: on 

 sheep, cattle, and horses, causing scab; the eggs hatch 

 in 2 or 3 days and the young mature in 15 days; the 

 females live several weeks, laying numerous eggs; an 

 infection thus spreads very rapidly and may cause the 

 death of the host; common in the west. 



3. CHORIOFTES Gervais. Females with suckers on 

 the fourth pair of legs: on the surface of the skin of 

 mammals, being restricted to certain parts of the 

 animal; 2 species. 



0. communis Ziirn. Length of female .42 mm.; width .27 mm.: 

 causes local inflammation in the ears of dogs, cats, and rabbits. 



4. CNEMIDOCOPTES Ftirst. Female without suckers on any of the 

 legs; mandibles chelate: on birds; 2 American species. 



C. mutans Robin (Fig. 693). Length of female .45 mm.; width .35 

 mm. : the itch mite of fowls, causing scaly leg, but also appearing among 

 the feathers. 



FAMILY 4. ANALGESIC AE. (DERMALEICHIDAE.) 



Bird mites. Minute mites with an elongated body, a transversely 

 striated integument and often a transverse suture between the front 2 



Fig. 693 



Cnemidocoptes 



mutans 



(Banks). 



