218 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
There is a slight dimorphism of the sexes in Kelloggia, consisting of 
the shape of the head and abdomen, and the former character is useful 
in separating the females of the various subspecies. In the above- 
mentioned series of specimens we have two types of genital armature, 
or rather of the endomeral plate, one type found in insects from 7. 
major castaneiceps (K. b. brevipes) and T. m. percautus (K. b. meai- 
canus), while the other type is present in the remaining list of hosts 
cited above. 
It isa very curious anomaly that the genitalia of the insects taken on 
T.m. latifrons and T. serratus ruficeps are extremely close to those of 
specimens from 7’. tao tao, one group being almost identical in size and 
shape, the other of the same shape but somewhat slenderer, but to 
counteract this similarity we have differences in the shape of the pre- 
antennal area of the head, as well as body measurements. 
When all these characters are considered, it seems best to arrange the 
various known forms of Helloggia in the following manner : 
KELLOGGIA BREVIPES BREVIPES Carriker 
FIGURE 28, g-i 
Kelloggia brevipes CARRIKER, Univ. Nebraska Studies, vol. 3, No. 2, p. 154, pl. 9, 
fig. 2, 1903 (host: Timamus robustus) ; Lice of the tinamous, p. 173, pl. 32, 
figs. 5, 5a, 1986 (host: Tinamus major castaneiceps; original designation of 
host incorrect). 
Of all the known races of Kelloggia brevipes the nominate form ex- 
hibits the greatest sexual dimorphism in the shape of the preantennal 
portion of the head. In the male the frons is very flat, with the sides 
almost angulated (see fig.), while in the female it is czrewlar and with 
the clypeal band crenulated at each side, the latter character found only 
on the female of XK. b. mexicanus, but combined there with a distinct 
antennal band (see fig.). The endomeral plate in brevipes is also 
distinctive. 
Measurements are given with those of A. b. mexicanus. 
KELLOGGIA BREVIPES MEXICANUS, new subspecies 
FIGURE 28, j-l 
Types.—Male and female, adults, from Tinamus major percautus, 
collected by the author at Tres Zapotes, Veracruz, haleraree, April 8, 
1940; in U.S. National Museum. 
Donate. —Nearest to the nominate form in the style of male geni- 
tal armature, but with preantennal region (especially in male) very 
different (see fig.). 
The frons is circular, not flatly rounded, and much wider, while the 
antennal bands in both sexes differ in having at their anterior portion 
' a narrow, deeply pigmented section which ends posteriorly in a slender 
