20 



PROCEEDINGS OF THE NA TIONAL 3IUSEU3L 



VOL. XXVIII. 



where it destroys the Zlsfropliorirs mites. No species have as yet 

 been recorded from this countr}'. Ilapj/>/r/npuJius (former! 3" Sar- 

 coptei'us) is represented by a few species tliat have a verv short, broad 



body, with very short leg-s, tlie hind 

 pairs ending" in a bunch of bristles. 

 They occur in the hair follicles of 

 several ])irds, where they form tu- 

 mors. The eggs are very large for 



-HARl'YKllYNlHrS L0>;GIF1LI"S, 

 FEMALE. 



Fig. 20.— Harpyrhyxchus longipilus, 



LARVA. 



the size of the mite. One species, IT. longqnlus Banks, has been taken 

 in the United States in a tumor under the wing of a cross-bill. The 



Fig. '21.— Myobia musculi. 



Fig. 22.— Psorergates simplex. 



genus Psorergates was described by Tyrrell from Canada. It lives 1 

 parasitically on the house and field mouse, in cavities or little cells I 

 just beneath the surface of the skin. It has a nearly round body, \ 



