MITES OF SUBFAMILY HAEMOGAMASINAE — KEEGAN 213 



952/x in length. The single measurable male was l,078ju, in length. 

 Vitzthum (1931) gives the length of the male as 1,150/x and reports 

 that the length of the female varies from l,100ju, to 1,380/i.. 



Remarks. — Distinctive characteristics of Haemogamasus hirsutits, 

 which make it possible to determine specimens of each sex from those 

 of other species, are : Female : All setae smooth ; large and small setae 

 interspersed on dorsal shield ; two pairs of accessory setae on anterior 

 margin of sternal shield ; 24 to 32 accessory setae on sternal shield ; an- 

 terior pair of sternal pores at level of anterior usual sternal setae. 

 Male : All setae smoth ; accessory setae over entire ventral shield ; two 

 pairs of accessory setae on anterior margin of ventral shield ; inter- 

 spersed large and small setae on dorsal and ventral shields ; specialized 

 setation of leg II; femur with three stout ventral setae; genu with 

 one stout and one medium ventral setae ; tibia with one stout ventral 

 seta; tarsus with two stout ventral setae; structure of chelae distinc- 

 tive. Nymph : Setation and mouth parts as in female. 



Although Berlese (1889), Oudemans (1913), and Vitzthum (1931) 

 describe H. hirsutus as possessing only three anal setae, the five female 

 specimens available each possess the three usual anal setae plus five ac- 

 cessory setae. The condition of interspersed large and small setae on 

 the dorsal shield of the female and on the dorsal and ventral shields of 

 the male has not been previously reported. 



Distribution and hosts. — This species has been reported by Berlese 

 (1889), Oudemans (1913), and Vitzthum (1931) from "various in- 

 sectivores" and "rodents" and their nests throughout Europe. I have 

 examined three females from a "dead mole," Cornwall, England, col- 

 lected in February 1943 (E. W. Jameson collection) ; one female from 

 "mouse nest," Hell Coppice, near Oakley, Bucks, England, Augl^st 17, 

 1941 (E. W. Jameson collection) ; one male from Talpa alpina, Ratece, 

 Slovenia, July 12, 1931; and one male and two females from "moles," 

 Reskadinnick, Camborn, Cornwall, England, June 9, 1946. 



HAEMOGAMASUS ALASKENSIS Ewing 



Figure 43 



Haemogamasus alaskensis Ewing, Proe. Biol. Soc. Washington, vol. 38, pp. 138- 

 139, 1925.— Vitzthum, Zool. Jahrb. (Abt. Syst.), vol. 60, p. 897, 1931. 



Haemogamasus sternalis Ewing, Proc. U. S. Nat. Mus., vol. 82, art. 30, p. 3, 

 pi. 1, fig. 2, 1933. 



Female. — Dorsal shield entirely covering dorsal surface to coxae 

 III, where there begins a thin crescent of unprotected integument as 

 the shield narrows. Shield densely covered with small, slender, often 

 barbed setae, most of which are between 10/a and 20fx apart and about 

 40/A in length ; pattern of setation broken at apex of shield, and setae 

 in that region larger, farther apart, and more conspicuously barbed. 



