Vol. XXvi] ENTOMOLOGICAL NEWS. 



109 



New Parasitic Mites (Acarina). 



By H. E. EWING and A. J. STOVER.* 



(Plate IV) 



Parasitism is a phenomenon of quite frequent occurrence in 

 the Acarina. Of the thirty or more families now recognized 

 in the order, no less than seventeen contain species that are 

 parasitic in their adult state ; while three more contain species 

 that have parasitic larvae. The number of parasitic species 

 found in the order is very large, several hundred already being 

 described. Yet, notwithstanding this large number of para- 

 sitic species, to say nothing of the enormous numbers of indi- 

 viduals that are frequently found upon a single host, up to the 

 present practically no systematic work has been done upon 

 them in this country, with the exception, of course, of the 

 ticks. 



In the following paper four new species are described. They 

 are distributed among three genera, and as many families. So 

 far, we have but a single species in each of these three genera 

 recorded from our country. Hence these new additions are 

 of rather special interest to those engaged in the study of 

 mites. The determinations of the species described in this 

 paper were made by Mr. Ewing. The drawings were made by 

 Mr. Stover. Types in the collection of the senior author. 



DESCRIPTION OF SPECIES. 

 Fam. GAMASIDAE. 



Haemogamasus sanguineus n. sp. (Text-fig. 1.) 



Engorged specimen tick-like in shape, body appearing red with many 

 black pellets contained inside showing through the skin. 



Female. Mouth-parts moderate; palpi about one-half as long as 

 the first pair of legs; chelicerae when extended reaching the tips 

 of the palpi. Distal segment of palpus almost twice as long as the seg- 

 ment next to it, well clothed with hairs, and bearing a sharp, spur-like 

 spine on its inner margin ; penultimate segment slightly longer than 

 broad, simple; antepenultimate segment about one and one-half times 

 longer than penultimate, slightly produced anteriorly at its inner mar- 



*A contribution from the Department of Zoology and I'lu si..!, ^y, 

 Oregon Agricultural College, Corvallis, Ore. 



