70 
Psyche 
[June 
tance The antennal segments : 1 : 2 : 3 : 4 : : 27 : 56 : 
130? : X ( * ) ; 1 : 2 : 3 : 4 : : 25 : 58 : 135 : 65 ( $ ). 
Pronotum: Length 60 units; pitting indefinite. 
Hemelytra: Short, 90 units long, covering the first 
abdominal segment, surface uneven, veins conspicuous. 
Coxae: The distance between the first and second coxae 
is to that between the second and third as 40 : 70. The 
anterior and middle acetabula have two pits on each side 
of the cleft. These are often obscure. 
Femora: The anterior femora surpassing the head by 
half the length of the first antennal segment. The hind 
femora surpassing the end of the abdomen. 
Abdomen : The last abdominal segment of the male 
without hair tufts. The first genital with hair tufts just 
laterad of shallow depressions which outline a faint median 
longitudinal ventral keel. Seen from above, the first genital 
is broadest at its base, the terminal dorsal process is cau- 
dally directed and short, only about one fifth the length of 
the segment in the male. In the female the terminal proc- 
ess is nearly one third the length of the segment and sharp 
pointed. The hair tufts on the caudal margin of the last 
abdominal tergite that are possessed by the females of 
several species are lacking in this one. 
Comparative notes: This new species belongs to the 
typically African group that includes H. ambulator Stal, 
H. albolineolata Reuter, H. africana H. & E., H. trans- 
Explanation of Plate 6 
Figs. 1-3. Hydrometra poissoni Hungerford. Fig. 1. Dorsal view of 
last abdominal segments of male. Fig. 2. Lateral view of last abdominal 
segments of male. Fig. 3. Ventral view of last abdominal segments of 
male. 
Figs. 4-8. Hydrometra goodi Hungerford. Fig. 4. Lateral view of last 
abdominal segments of female. Fig. 5. Lateral view of last abdominal 
segments of male. Fig. 6. Dorsal view of last abdominal segments of 
female. Fig. 7. Dorsal view of last abdominal segments of male. Fig. 8. 
Ventral view of last abdominal segments of male. 
(Drawings by Thomasine Neering) . 
