528 Mr. R. I. Pocock on the Morphology and 
b. Mandible with ahout four rows of pectinations. 
First leg in male not enlarged, slightly or 
considerably modified; gnathochilarium un- 
modified. Second leg in female normal; no 
large genital sclerites ....0...eseseccsee Iulide, Blaniulide, 
Nemasomidz. 
SPIROBOLOIDEA. 
Genus EvcENTROBOLUS, nov. 
Labral pores 2+2. 
Antenne about as long as the uncovered portion of the 
head, relatively close together, the distance between them 
about equal to the distance between the edge of the labrum 
and the summit of the antennal socket, and the distance 
between the antennal socket and the nearest point on the 
lateral border of the head equal to half the distance between 
the two sockets and to three times the diameter of the basal 
antennal segment. Subocular area of ead hollowed longi- 
tudinally, so that the inferior edge of the ocular area stands 
up as a distinct and obtuse ridge. Distance between eyes 
scarcely equal to 15 times their transverse diameter. 
First tergal plate large, with a row of tubercles along its 
posterior border, which is slightly elevated. Postsulcal area 
of all the remaining terga except the last elevated and 
furnished with a transverse row of blunt tubercular spines 
from twelve to fifteen in number, irregularly spaced, the 
intervals between them occupied by smaller tubercles. 
Sterna transversely ridged. 
Pores beginning upon the sixth segment, small, in advance 
of the sulcus, those of the sixth segment on the same level 
as the rest. 
Anal tergite produced into a long caudal process. 
Eucentrobolus tamulus, sp. 0. 
¢.—Colour black, not shining ; legs and antenne ferru- 
ginous. 
Head granularly rugose, transversely grooved inferiorly, 
the median groove deep above and below, mesially obsolete ; 
forehead lightly depressed. 
Eyes consisting of about thirty-five ocelli. 
First segment very large, the widest of the body, coarsely 
coriaceous, the anterior border lightly concave inferiorly, 
inferior angle acute but rounded, posterior border somewhat 
abruptly and obliquely cut away to form the posterior border 
of the inferior angular termination. Second segment with 
