t58 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
vidual host. Superficially it much resembles both of the above-men- 
tioned species, but both sexes possess characters that make their iden- 
tification positive, especially the male, in which the outstanding 
character is the presence of two scent glands of a most unusual appear- 
ance on abdominal pleurites TV and V. (Carriker, 1936, p. 53, pl. 12, 
fig. 3.) 
The female may be distinguished by the shape of the last abdominal 
segment and by the presence of three short, thickened spines on the 
posterior margin of abdominal pleurites II and III. The last abdomi- 
nal segment extends far beyond the sixth, is much narrower, is cir- 
cular on the posterior margin, is slightly pointed at the tip, and has a 
deep, narrow, median emargination. The suture separating segments 
VI. and VII is fused medially in all the races of temporalis I have 
seen, 
An examination of the females of this species shows that, like man- 
dibularis and inexpectata, all races have a small, somewhat crescent- 
shaped scent gland at the inner edge of the first abdominal pleurite, 
which is incised to receive it. Its shape is totally unlike the same gland 
found in the male on segments IV and V. 
The female of H. ¢. feminenus has abdominal segment VII more like 
that of the male in Z. ¢. temporalis, but it is wider and shorter and is 
likewise fused medially with segment VI. (My pl. 16, fig. 3, in “Lice of 
the Tinamous,” 1936, is wrong in this respect; it should be the same as 
in temporalis.) The female of H. t. chiniriz is unknown. However, the 
females are always difficult to separate, the differences being so slight 
that they are not always recognizable unless accompanied by their re- 
spective males, but they can always be separated from the same sex of 
mandibularis and inexpectata by the arrangement of the spines on the 
pleurites and by the shape of the last abdominal segment. 
HEPTAPSOGASTER TEMPORALIS ACUTIVENTRIS Clay 
FIGURE 15, f, g 
Heptapsogaster temporalis acutiveniris CLAY, Proc. Zool. Soc. London, ser. B, 1937, 
p. 135, fig. 4a, pl. 1, figs. 1,2. (Host: Crypturellus cinnamomeus mexicanus.) 
This subspecies differs from the nominate form as follows: 
Male: The front of the head is wider and more flattened, with the 
whole head shorter and wider; the prothorax has the sides more nearly 
parallel (less divergent posteriorly) ; the mesothorax is porportion- 
ately wider, extending farther beyond the sides of the abdomen; 
abdominal segment VII is larger and of quite different shape (see 
fig.), being elongated posteriorly, with tip bluntly rounded, not 
emarginate as in 7, t. temporalis. 
The genital armature is decidedly different, as may be seen by the 
two figures. 
