62 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
bristle in front of the eye, and further forward two shorter ones. From the eye 
upwards there is a number of very short but distinct hairs arranged in three or four 
irregular longitudinal rows. The occiput bears three bristles above the antennal 
groove, the anterior one being smaller than the others, there are also several other 
hairs on the side, and a subapical row of five or six bristles. The proportional 
lengths of the four segments of the maxillary palpus are in the $ n, 7, 6, and 10, 
and in the $ 19, 9, 6, and 10. The maxilla is short and slightly curved forward, 
being very different from the long and acute maxilla of H. pulex. 
Thorax. — The pronotum bears a row of seven to ten bristles in the $, and of 
six to eight in the The sternite of the prothorax is posteriorly produced into a 
conical projection. The meso- and metanotum are larger in the $ than in the 
The mesonotum bears in the # a row of five to seven bristles, while there are in the 
% only two or three bristles standing on the lower portion of the notum. The 
metanotum has in both sexes a short row of bristles dorsally, the number of bristles 
being four to five in the J, and two or three in the There is one long bristle 
each on the meso- and metasternum near the upper edge. The metathoracical 
epimerum bears four or five bristles, one or two standing just beneath the stigma, 
and three more being placed in a vertical row a little more forward. The epimerum 
is rounded above, becoming narrowed ventrally. 
Abdomen. — The tergites one to seven bear in the $ a row of four bristles on 
each side ; in the $ there are three or four bristles only on the first and second 
segments, the third to six tergites being devoid of bristles, and the seventh bearing 
only one on each side. There are no bristles on the sternites of segments two to 
seven. 
Legs. — The mid and hind coxae are wider at the apex than the trochanters, the 
anterior apical corner projecting a little. The posterior apical lobe of these coxae is 
rather long. It does not bear a bristle itself, but there is a long one just above it 
(PI. I, Fig. 6) posteriorly. The hind femur bears a row of seven or eight bristles. 
There are no hairs on the lateral and ventral surfaces of the tibiae. The dorsal 
incisions are five in number, inclusive of the apical one. The dorsal bristles of the 
fore tibia are short and stout, except a bristle each of the third and apical pairs. All 
the bristles of the mid and hind tibiae are slender, the long middle one and the apical 
ones of the hind tibia being nearly as long as the tibia. The tarsal segments 1 to 4 
have bristles only at the apex, these bristles being very long on the hind tarsus, the 
longest bristle of the second segment reaching nearly to the apex of the claw ; 
sometimes there is a pair of bristles on the hinder side of the first segment beyond 
the middle. The fifth segments of the fore and mid tarsi are characteristic (PI. IV, 
Fig. 32). It bears on each side a row of eight short stout bristles, besides a long sub- 
apical hair. There are also two spine-like bristles ventrally at the apex. The claw 
is very long and slender, but has a distinct basal projection. The measurements of 
the mid and hind tarsi are as follows : — 
