STUDIES IN NEOTROPICAL MALLOPHAGA—CARRIKER 215 
tween the two lots of insects, is not of sufficient importance to deserve 
nomenclatural recognition. * Therefore the insects from 7. serratus 
rujiceps may be classed as O. a. robustus Carriker. 
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ORNICHOLAX ALIENUS MEXICANUS, new subspecies 
FIGURE 27, C 
Types.—Male and female, adults, from 7inamus major percautus, 
collected by the author on Cerro Tuxtla, Veracruz, Mexico, March 
23, 1940; in U.S. National Museum. 
Diagnosis——This race is perhaps closer to boliviensis in type of 
genital armature than to robustus, although the endomeral plate dif- 
fers markedly. The measurements are also nearer to those of bolivien- 
sis. Like robustus, mexicanus has the head wider than long in both 
sexes (male 0.80 by 0.89; female 0.83 by 0.98). ‘This subspecies is 
represented by two males and three females, including the types, all 
from the same individual host. 
_ Five males taken on two individuals of Tinamus major fuscipennis, 
collected by the author on the Rio Sicsola, Costa Rica, are somewhat 
slenderer than the Mexican specimens from 7’. m. percautus, but the 
genital armature is practically identical in every particular (head 
0.79 by. 0.836 against 0.80 by 0.89; mesothorax, 0.826 by 0.89 against 
0.84 by 0.93; metathorax, 0.337 by 0.59 against 0.32 by 0.63; abdomen, 
1.28 by 1.17 against, 1.41 by 1.28). These slight differences do not 
seem to be worthy of recognition, especially since the male genitalia 
are so nearly alike. Therefore the insects from 7’. m. fuscipennis may 
be called O. a. mexicanus. 
ORNICHOLAX ALIENUS BOLIVIENSIS, new subspecies 
VIGURE 27, d 
Types.—Male and female, adults, from Tinamus s. serratus, collected 
by the author at Santa Ana, Rio Coroico, Bolivia, July 26, 1934; in 
collection of author. 
Diagnosis —This is the only known race that has the head of equal 
length and breadth, in both sexes (male 0.78 by 0.78; female 0.84 by 
0.836). With the exception of taoz, which has the head longer than 
wide, all the other races have it des than long. 
The genitalia are also quite different in detail and proportions. The 
paramers are shorter and more sharply curved, with the lateral lobes 
reaching much farther toward their middle. The lateral, spine-bear- 
ing lobes of the endomeral plate are short, while the distal end of the 
plate has angulated sides. Represented by six males and two females. 
