1910 



EXTOMOLOGICAL SOCIETY 



101 



Family Listkophoridae. 



These are closely related to the bird mites and live upon mammals. Our 

 species was found on the muskrat. They also are small, soft-bodied mites, with 

 short legs terminating in a sucker. Similar to the bird mites they feed upon the 

 hairs of the small mammals. 



Listrophorus validus. Banks. Taken from muskrat. T. D. J., Guelph. 



Family Sarcoptidae. 



These are the itch mites of man and domestic animals, birds, etc. They, in' 

 some cases, burrow within the skin and thereby produce intense itching, and in 

 many cases a diseased condition of the host, commonly known as scabies or mange. 

 The mites are very small, white and semi-globular in shape. Several species of this 

 family have been found in Ontario. 



Sarcoptes scabies, Itch mite. (Figs. 29 and 30.) Host, horses. Ontario, T. D. 

 J., Guelph. 







Fig. 29. Male Itch Mite. 



Fig. 30. Tunnel of Female Itch Mite beneath the skin — adult 

 at left end, eggs throughout the tunnel. 



Chorioptes symhiotes, var. equi, Verheyen. On legs of horses. T. D. J.. 

 Guelph. 



Chorioptes symhiotes, var. lovis. On cattle. T. D. J., Guelph. 

 Psoroptes communis, Furst. On sheep. Manitoulin Island. T. D. J. 



Family Eriophyidae. 



This is a family of microscopic mites, which are quite curious and unusual in 

 structure. They have only two pairs of legs and the abdomen is long and striated. 

 These striations, which differ in the different species and differ in number on the 

 dorsal and ventral surfaces, are of considerable importance in the classification. 

 The galls produced vary in form, but are always open or provided with an opening 

 through which the mites pass in and out. They are generally lined with minute 

 hairs (trichomes), which may be simple or branched. The different types of 

 Eriophyid galls are shown in figures 31 to 39. Sixty-six species occur in Ontario. 



