ART. 13. DERMANYSSID MITES OF NORTH AMERICA——-EWING, 25 
Genus ALLODERMANYSSUS Ewing. 
ALLODERMANYSSUS SANGUINEUS (Hirst). 
Female.—-Palpi slender, reaching to the tips of anterior femora; 
chelicerae showing plainly the needlelike elements representing both 
arms. Dorsal shield divided; anterior shield broadest at the shoul- 
ders, lateral margins behind the shoulders concave; posterior shield, 
circular, minute. Sternal plate squarish, lying entirely between the 
second coxae, with three pairs of subequal marginal setae. Anal 
plate egg-shaped in outline, anterior margin broadly rounded; anus 
situated centrally, rim very thin in front and on the sides, but enor- 
mously thickened behind; paired setae situated at the level of the 
center of the anus; median seta situated about two-thirds its length 
behind anus; caudal area reaching about halfway to the base of 
median seta. Legs very long and slender. Length, 0.91 mm.; width, 
0.46 mm. 
Male.—Not observed by the writer. Hirst states in regard to the 
male: ‘Dorsal shield wide anteriorly but progressively narrowed 
posteriorly, the terminal part of it being quite narrow and the ex- 
treme end blunt —.”’ Also he states: ‘‘Sternoventral plate (holoven- 
tral plate of the writer) with the sides not so straight asin D. muris, 
and narrowed so as to form a distinct neck in front of the slightly 
enlarged anal portion; eight pairs of hairs and the usual unpaired 
posterior hair are present on this plate.”” The length of the body 
according to Hirst is 0.7 mm. 
Type locality.— Egypt. 
Type.—Has not been selected. 
This description of female based on five specimens taken on a 
desk, Washington, District of Columbia, June 30, 1909, by Mr. 
Dewey. This is the only American record known to the writer. 
Hirst obtained specimens from Mus, Arvicanthis, and Acomys. 
