12 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
about its length behind the anus; caudal area large, not crescent- 
shaped, and provided with longitudinal roughened ridges. Anterior 
legs longer than the second legs, which are slightly the stoutest. 
Length, 0.65 mm.; width, 0.39 mm. 
Male.—Smaller than the female. Palpi without the conspicuous 
inner horn of basal segment found in the female; chelicerae about as in 
female. Dorsal shield large and entire, covering most of the body 
and reaching almost to the tip of abdomen, broadest at the shoulders 
and with lateral margins convex behind the shoulders. Holoventral 
plate broadest at its angular expansions between the second and 
third coxae, not laterally expanded on the ventral surface of abdo- 
men; genital duct chitinized for a considerable distance behind the 
genital opening; genital opening with well-developed rim; genital 
setae situated about halfway between the genital opening and lateral 
margins of plate. Anus with longitudinal diameter about twice as 
great as transverse, and situated about two and one-half times its 
greatest diameter in front of posterior margin of holoventral plate. 
Length, 0.61 mm.; width, 0.35 mm. 
Type locality —Batesburg, South Carolina. 
Type slide —Cat. No. 24745, U.S.N.M. 
Described from several cotypes mounted on two slides. Specimens 
on one slide taken from a small bat (N. humeralis), July 3, 1912, and 
on other slide from a bat, May 20, 1914. Both lots from type local- 
ity by E. A. McGregor. 
Genus SERPENTICOLA Ewing. 
SERPENTICOLA SERPENTIUM (Hirst). 
Female —A medium-sized, rather long and hairy species. Palpi 
about reaching the tips of anterior femora. Two dorsal shields, the 
anterior shield covering most of the cephalothorax and being almost 
circular, while the posterior shield is minute. It is also almost circu- 
lar and is situated directly above the anal plate. Peritreme slightly 
curved and not quite reaching the middle of second coxa. Sternal 
plate fully twice as broad as long and lying entirely between the sec- 
ond coxae; anterior setae situated slightly behind the anterior margin 
but posterior setae situated directly on the lateral margins. Anal 
plate pear-shaped in outline, anus with longitudinal diameter much 
the greater, rim heavily chitinized. The anus itself is situated 
entirely in front of the middle transverse line; paired setae situated 
about halfway between rim of anus and lateral margins of anal plate; 
median seta situated a little over its length from the posterior margin 
of anal plate. Anterior legs considerably longer than second pair. 
Length, 0.79 mm.; width, 0.39 mm. 
Male —Unknown. 
