252 Part WL—Twelfth Annual Report 
from near the base of the first joint (fig. 11). The basal part of the 
mandible-palp bears two spinulose sete at the apex. The primary branch 
is furnished with one marginal and three terminal sete, while the second- 
ary branch consists of asmall papilla bearing a single small hair. Pos- 
terior foot-jaws short, stout, two-jointed, and armed with a moderately long 
terminal claw. First pair of swimming-feet short, moderately stout ; both 
branches of nearly equal length; the inner branches composed of two, 
the outer of three sub-equal joints (fig. 14). The first pair closely 
resemble those of Attheyella pygmea (G. O. Sars). Inner branches of 
second, third, and fourth pairs small, onejointed. Those of the fourth 
pair rudimentary y, and bearing a short terminal spine. Outer branches 
elongate, the third joint being nearly equal to the combined length of 
the other two (fig. 15). The fifth pair consist each of a single joint (or 
branch), sub-quadrangular in form, but rather longer than broad, and 
extends obliquely outwards from its attachment to the fifth thoracic seg 
ment. A number of long stout plumose sete: fringe the oblique exterior 
margin, while a few plain sete spring from the truncate apex, as shown 
in the figure (fig. 16). Caudal stylets very short. 
Habitat. — Off sdanipaen Not common. 
Genus Heteropsyllus,* nov. gen. 
Body sub-cylindrical. Anterior antenne shorter than the first body seg- 
ment, and composed of five joints. Posterior antenne like those of Cletodes, 
but the secondary branch consists of two joints. Mandible-palp small, with 
a distinct basal part bearing two small branches. Mouth organs as in 
Pontopolites. Both branches of the first pair of swimming-feet three- 
jointed, the inner being rather longer than the outer branches. Inner 
branches of the second, third, and fourth pairs two-jointed, and consider- 
ably shorter than the elongate three-jointed outer branches. Fifth pair 
two-branched, Foliaceous. One ovisac. 
Heteropsyllus curticaudatus, sp.n. (Pl. VIII. figs. 27-34 ; Pl. TX. fig. 1.) 
Description.—Female. Length, ‘5 mm. (5th of an cee Body elon- 
gate, sub-cylindrical. Forehead produced into a short rostrum (fig. 27, Pl. 
VIII.). Anterior antennz stout, shorter than the first cephalo-thoracie seg- 
ment, and composed of five joints, the fourth being very short. The 
approximate proportional lengths of the joints are shown by the formula :— 
HOV? og Sie 
Ate hoe te eo Ce, 
The two-jointed secondary branch of the posterior antenne is furnished 
with four smal] setz,—one at the end of the first joint, a marginal and 
two terminal sete on the second joint (fig. 29, Pl. VIII.). Mandible-palp 
small, but distinctly two-branched (fig. 30, Pl. VITI.). Posterior foot-jaws 
small, and in form somewhat similar to those of the species last described. 
Both branches of the first pair of swimming-feet composed of three sub- 
equal joints, the inner rather longer than the outer branches*(fig. 32, Pl. 
VILI.). Outer branches of the second, third, and fourth pairs elongate and 
three-jointed, somewhat slender. The third joint of all the outer branches 
is longer than either the first or second joints, Inner branches shorter than 
the outer, and two-jointed ; those of the fourth pair scarcely longer than 
the first joint of the outer branches (fig. 38, Pl. VIII.). The basal joints 
of the fifth pair are large, broadly but somewhat obliquely rounded at the 
distal end, and provided with five terminal setz ranged at more or less 
equal distances from each other round the apex and lower inner margin. 
* "Erepos, different ; Wvados, a flea, 
