Trombidiformes 



235 



Cooper, K. W. 1946. The occurrence o\ the mite, Cheyletiella parasitivorax 



(Megnin) in North America, with notes on its synonymy and 



"parasitic" habits. J. Parasitol. 32(5) :480-482. 

 Ewing, H. E. 1912. The life history and habits of Cheyletus seminivorus 



Packard. J. Econ. Ent. 5(5) :416-420. 

 McGregor, E. A. 1944. A new potential enemy of the bud mite. CaUf. 



Citrograph 30(2) :53. 

 Olsen, S. J., and H. Roth. 1947. On the mite Cheyletiella parasitivorax, 



occurring on cats, as a facultative parasite of man. J. Parasitol. 33 



(5): 444-445. 

 Oudemans, A. C. 1906. Revision des Cheletines. Mem. Soc. Zool. de 



France 19:36-219. 



Demodicidae Nicolet, 1855 



Figures 174, 175 



Diagnosis: The demodicids are weakly colored, very small mites 

 from 0.10 to 0.39 mm. long. They are vermiform, annulate, and eight- 

 legged. The legs are short, stumpy, five-segmented, and located on the 

 anterior portion of the body. The chelicerae are stylet-like as in the 



Figure 174 Demodex miiscardini Figure 175 Demodex muscardini 



Hirst. Dorsal view of male. (After Rirst. Ventral view of female. (After 

 Hirst 1919) Hirst 1919) 



Cheyletidae. A capitulum which covers the palpi and the chelicerae is 

 present. The palpi are three-segmented and the distal segment has four 

 or five rodlike setae. There is a pair of minute openings located on the 

 venter of the capitulum near the base. The female genital opening is 

 situated between or behind coxae iv, while the male genital opening is 

 dorsal in the center of the podosoma. No genital suckers are present. 



