22 PROCEEDINGS OF THE NATIONAL MUSEUM. VoL, 62. 
long; anterior pair longer than the second pair and about equal to 
the last pair; last pair reaching to about the tip of the abdomen. 
Length, 1.02 mm.; width, 0.61 mm. 
Male.—Unknown. 
Type locality —F lorence, Montana. 
Type (holotype).—Cat. No. 24751, U.S.N.M. On type slide are 
three females, one replete and two only slightly engorged. Only one 
of the latter is mounted ventral side up, and it is selected as type. 
On “S. h. richardsoni,”’ at Florence and Derby, Montana (Dallas 
aces. 2452 and 2294). 
LIPONYSSUS TENUISCUTATUS, new species, 
Female.—Palpi rather large, reaching tips of patellae; chelicerae 
slender. Dorsal shield very long, extending from base of beak to tip 
of abdomen, greatest width less than one-half that of body, margins 
behind the shoulders slightly convex. Peritreme long, sinuous, and 
extending to opposite the first coxae. Sternal plate broader than 
long. Anal plate very long and somewhat pointed in front; anus 
oblong, rim uniform; paired setae long, equal to longitudinal diame- 
ter of anus and situated opposite the middle of same; median seta 
longer, slightly, than the paired setae and situated about its length 
behind the anus; caudal area extending halfway from tip of plate to 
base of median seta. Legs moderate; leg I longer than leg I], and 
with tibia about one and three-fourths as long as wide; last pair of 
legs scarcely reaching the tip of abdomen. Length, 0.62 mm.; width, 
0.37 mm. 
Male.—Unknown. 
Type locality.—Cuba (2). 
Type (holotype).—Cat. No. 24750, U.S.N.M. 
A small female specimen obtained on sweet potatoes from Cuba, 
collected at Pascagoula, Mississippi. 
LIPONYSSUS BURSA (Berlese). 
Female.—Smaller than the female of Dermanyssus gallinae. Palpi 
rather large, extending to the tip of patella of leg I; chelicerae with 
cutting surfaces of both arms well developed, each arm tipped with 
a straight, spinelike hook set at angles to main axis. Dorsal shield 
large, sides convex behind the shoulders, at its greatest width 
falling short of the lateral margins of cephalothorax. Peritreme long 
and sinuous, reaching to opposite coxae I, and with a slight bulblike 
enlargement at its opening at the stigma. Sternal plate about twice 
as broad as long and lying entirely between second coxae. Anal plate 
about twice as long as broad, pointed in front; anus with longitu- 
dinal diameter considerably greater than transverse, rim uniform, and 
situated entirely in front of middle transverse line; paired setae sit- 
