ART. 13, DERMANYSSID MITES OF NORTH AMERICA—-EWING. 155) 
rowed before the anal portion.” Hirst gives the length of the body 
of the male as 0.43 mm. 
Type locality Assiit, Egypt. 
Type.—Not established. Type host.— Mus norvegicus. 
North American records as follows: On mice, New York City, 
December 30, 1919; on mouse, St. Louis, Missouri, from Dr. L. Loeb; 
from young mouse, H. L. Osborn; on heads of children and on mice, 
Laredo, Texas, through Public Health Service, 1921; from walls of 
railroad station, Longwood, Mississippi, April 12, 1921 (Mound No. 
1034), also specimens from same locality by Dr. Van Dine (Mound No. 
1031); biting men working in basement, Fort Worth, Texas, April 
21, 1921; annoying man, Dallas, Texas, May 25, 1921 (Bishopp No. 
10062); in hair of house mouse, Washington, District of Columbia, by 
Dr. E. Francis, July 1921. Exotic records are from Egypt, Abyssinia. 
Australia, and Argentina. 
LIPONYSSUS PACIFICUS, new species. 
Female.—Palpi extending to the tips of femora of front legs. 
Chelicerae slender; arms slender and slightly unequal, the outer being 
a little longer and 
hooked at the tip. 
Dorsal shield almost 
reaching across. the 
cephalothorax at the 
shoulders, lateral mar- 
gins slightly convex 
behind the shoulders. 
Sternal plate twice as 
broad as long and ex- 
tending only between 
the second coxae; pos- See 
terior angles produced 
into long cusps; ante- oh 
rior setae directly upon 
the anterior margin of Fic. 7. LIPONYSSUS PACIFICUS, NEW SPECIES. STERNAL PLATE. 
sternal plate; all sternal setae subequal and inarow. Anal plate 
broadly rounded in front; anus with greatest diameter longitudinally, 
rim thicker in front and behind; anus situated entirely in front of a 
middle transverse line; anterior setae situated slightly behind the 
level of the central point of anus; median seta extending beyond the 
tip of plate; caudal area extending to over halfway to the base of 
median seta. Legs moderate. Length, 0.57 mm.; width 0.32 mm. 
Male.—Unknown. 
Type locality —Corvallis, Oregon. 
Type (cotypes)—Cat. No. 24752, U.S.N.M. 
Many specimens from nest of brewer's blackbird, by A. J. Stover. 
