14 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
and situated entirely in front of middle transverse line; paired setae 
very long and situated about one-half the distance from the rim of 
the anus to the lateral margins; median seta very long and situated 
about one-half its length from the tip of anal plate. Length, 0.81 
mm.; width, 0.45 mm. 
Male.—Unknown. 
Type locality.—Plummer Island, Maryland. 
Type.—Cat. No. 24746, U.S.N.M. 
Described from a single female the only specimen present in the 
U.S.N.M. collection. It 
ct ot ete was taken from a wood- 
chuck, May 19, 1912, by 
H.S. Barber. 
ICHORONYSSUS CARNIFEX 
(C. L. Koch). 
Female.—Stout and 
sparsely clothed with mi- 
nute setae. Dorsal shield 
large, not entirely covering 
Q 
the cephalothorax, lateral 
\ margins behind the shoul- 
\ / ders concave. Peritreme 
Ny Vi | very long and sinuous, ex- 
( tending slightly beyond 
FIG. 6.—ICHORONYSSUS STERNALIS, NEW SPECIES. STERNAL the first coxae. Sternal 
PLATE. Ce 
plate archlike, having the 
posterior margin deeply crescentic, reaching the third coxae; anterior 
setae situated almost on the anterior margin; middle setae situated 
almost on lateral margins but outside of line from anterior to poste- 
rior setae; posterior setae situated at about equal distances from 
inner, outer, and posterior margins of corner projections of sternal 
plate; all sternal setae long and subequal. Anal plate somewhat 
heart-shaped; anus oval in outline and situated entirely in front of 
middle transverse line; anal area large and extending almost to base 
of median seta. Legs stout, especially first two pairs; femur of leg I 
with two conspicuous spines above, the inner being the longest. 
Length, 0.60 mm.; width, 0.36 mm. 
Male.—The writer has never seen a male of this species, but 
Oudemans has given a very complete description of it, and a group 
of eight drawings. The following diagnosis is made from Oudemans’s 
drawings: Dorsal shield very large, covering most of the body above 
and extending almost to the tip of abdomen, broadest at the shoul- 
ders, slightly convex on the sides, and broadly rounded behind. 
Holoventral plate broadest at its angular extensions between the 
