STUDIES IN NEOTROPICAL MALLOPHAGA—CARRIKER 183 
HEPTARTHROGASTER GRANDIS Carriker 
FIGuRE 21, a-d 
Heptarthrogaster grandis CARRIKER, Lice of the tinamous, p. 136, pl. 20, fig. 3, 
1936. (Host: Tinamus s. serratus.) 
This species was described from a single female and was placed in 
Heptarthrogaster with some misgivings, since the male was unknown. 
I now have two males and five females of what seems to all appear- 
ances to be the same species but collected on Zinamus t. tao, in the 
Sierra Perijé of Colombia. The measurements of the type (aiter cor- 
rection) prove to be extremely close to the females taken on 7’. ¢. tao 
(see table of measurements), while I can find no differences in shape 
of body segments or chaetotaxy in the females. 
Under these conditions it seems advisable to label these specimens 
from Tinamus t. tao as H. grandis and describe the male as such. If 
the males from 7’. s. serratus should prove to be distinct from the male 
here described as grandis, then the insects from Tinamus tao will be 
without a name, but I doubt very much if they will prove to be 
different, since the females are apparently identical. 
Description of male: The antennae are strongly dimorphic, the 
first segment being much lengthened and thickened; the second is 
short, but thick, while the third has a medium-sized hook at the 
distal end, much less developed than in either minutus or parvulus. 
There is little difference in the shape of the head in the sexes, the 
frons being slightly more flattened in the male, with the trabecular 
tubercles somewhat larger, as well as the internal projections on the 
frons. There are no differences between the sexes in the markings of 
the head and thorax, but the prothorax is smaller in the male. 
The abdomen is shorter and narrower than that of the female and 
more ovoid; the pleural plates are wider and lack the small hooks at 
the inner posterior corner on segments II to V; the shape of the in- 
crassations on the pleural plates also differs shghtly between the 
sexes, the hook at the posterior end of the marking being more open 
and with the end lengthened horizontally in the male. 
In the female the sternal plates of the abdomen are continuous 
across the abdomen but very faintly pigmented, while the tergites are 
separated from both the pleural plates and from each other medially 
(the published figure of the female does.not show the faintly pig- 
mented sternites). 
In the male the tergites are closely joined to the pleural plates and 
almost touch each other medially but are much more widely sep- 
arated horizontally by hyaline spaces than in the female. Segments 
Vi and VII are shorter in the male, VI having the tergal plate con- 
tinuous, while VII is flatly rounded both anteriorly and posteriorly 
and protrudes but slightly beyond segment VI. 
