202 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
genitalia of P. v. verrucosa is incorrect, and belongs, rather, to the new 
race described below. In my present treatment of this group, accord- — 
ing to the number of papillae present on abdominal tergites III to V, 
the male of typical verrucosa cannot be included, since it has not been 
seen, although it is of rather more importance than the female in this 
character. Nevertheless, there is one significant feature present in 
the female from C@. v. salvini, viz: the presence of a short third row of 
smaller papillae above the others, on all three tergites under considera- 
tion. 
Specimens of P. verrucosa were taken on all four forms of tinamous 
collected on the Mexican expedition. A careful study of all these 
specimens, together with specimens of P. v. verrucosa, P. v. parva, P. 
v. angusta, and P. v. yapurae, reveals the following facts: 
There is considerable individual variation in the number of papillae 
present on the various body segments, but outside of this individual 
variation there is a definite variability in the number to be found on the 
abdominal tergal plates ITI, 1V, and V. Among all the males, that of 
parva invariably has the greatest number, there always being present 
two to five in both rows on all the segments under discussion, while 
among the females vervucosa has the highest number (five to eight in 
both rows on all segments) and in addition a therd row of smaller 
papillae above the other two. The males from 7inamus major per- 
cautus and Crypturellus soui meserythrus have no papillae at all on 
segments IV and V and but one row of three or four on segment ITT, 
while in angusta there are none on the fifth segment, with one row of 
two to four on segments ITI and IV. 
The only females that have no papillae on segment V are those from 
C. cinnamomeus sallaei (no male taken) and 7. major percautus, 
but both have double rows of four or five each on the other two seg- 
ments. | 
There is also a wide range of measurements between the parasites 
from different hosts, by far the largest being from Z%namus, while 
parva, from C. tataupa, is the smallest, with those from C’. souz mesery- 
thrus almost as small. 
It is unusual to find that the genitalia of all three of the males taken 
from the different Mexican hosts are practically identical in shape 
and detail, differing only very slightly in the length of the paramers, 
_ while the width at base of paramers and the combined length of endom- 
eral plate and penis are identical in the three, as well as the length of 
the basal plate. 
The genitalia resemble very closely those of P. v. yapurae (see Car- 
riker, 1936, pl. 29, fig. 1b). It is thus apparent that the only char- 
