OF WASHINGTON. 137 
tapering behind to narrowly truncate tip; with about 60 to 70 stout 
bristles above, those near tip longer than others; a submedian and a 
marginal row of these on the shield. Legs quite short, with many short 
hairs and bristles. Anal shield elongate, broad and broadly rounded 
in front, tapering and pointed behind, a pair of short bristles in front 
and three larger ones behind. Sternal shield between coxae ii broad, 
sub-quadrangular, straight behind, convex in front, a bristle near each 
corner. 
Length .45 mm. 
Several specimens taken from the arm of a person in Wash- 
ington, D. C. This species is figured on page 53 of the "Treat- 
ise." 
H&magamasus americanus n. sp. 
Pale reddish, or yellowish. Body elongate oval; dorsum with many 
short stiff hairs. Legs moderately slender, tarsi long and slender, tarsus 
iv but little longer than i; all legs thickly strewn with short, stiff spine- 
like hairs or bristles. Leg ii ( $ ) very slightly thicker than other legs. 
Anal shield elongate oval, rounded behind, somewhat pointed in front, 
fully three times as long as anal opening, a pair of bristles near front, 
one each side of the aperture, and three in a curved row behind. Peri- 
treme very long and but slightly curved. 
Length .9 mm. 
In nest of a mouse (Peromyscus eremicus), in the Santa Rita 
Mts., Arizona (Hubbard). It is figured on page 54 of the 
"Treatise." 
Macrocheles carolinensis n. sp. 
Body reddish, legs yellowish; soft parts white. Body one and two- 
thirds as long as broad, much narrowed in front, broadly rounded behind. 
Dorsum smooth, without hairs, nor any on the hind margin. Leg i 
slender; leg ii noticeably thicker even in female, in the male the lower 
side of femur ii has two or three rows of several rounded tubercles; at 
tip of patella below is a sharp projection. The female has the anal 
plate very broad near base, narrower at base and narrowly rounded 
behind. The legs bear a few simple hairs. 
Length 1.6 mm. 
Several specimens from Black Mts., N. Carolina (W. Beuten- 
nmller). I have figured the species on pages 59 and 60 of 
my "Treatise on Acarina." 
CelcBnopsis americana n. sp. 
Body one and a half as long as broad, narrowed in front, broadly 
rounded behind. Above and below smooth and shining; yellowish. 
Dorsum with many short fine hairs, two longer hairs each side on posterior 
margin near tip; two pairs above these on dorsum, one near middle, 
