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with genitalia like those of the winged males and
weak ones, which have a fontanella gland and
are probably homologous with the soldiers of
termites. These males have no differentiated ge­
nitalia, the genital tract being quite simple, ne­
vertheless they are fertile and functional".
It is possible that Z. huxleyi correspond to
this categorie of "weak males" as they have not
the external "phallomeres" nor the horseshoe
plate. All the genitalia that it possess are the
structures placed in Tergites VI-VIII (figs. 3 and
4) which appears as a membranous endophallus,
laterally delimitated by two phallic sacs, clothed
with pointing chitinous plates and ending each
in a pine cone like scaly piece, all in connexion
with an ejaculatory duct and peneal apodemes.
By the armature of spines of the hind femora,
Z. huxleyi enters in Paragraph 2 of the key given
by Gurney (1938: 59-60) in which are put those
|M>ssessing 2 or 3 femoral spines noticeably lon­
ger and stronger than the others, group inte­
grated by: hubbardi Caudell, and snyderi Cau-
dell, both from U. S. A.; mexicanas C. Bolivar,
from Mexico; barberi Gurney, from Cocos Is­
land, and shannoni Gurney from Bolivia.
It differs from Z. hubbardi because this be­
long to the group that have the VIII tergite
with the posterior margin produced in a median
lobe, and the IX tergite presenting a median
isolated sclerite. It differs further because hub­
bardi has the phallomeres or genital lobes in the
site of tergite X.
From mexicanus C. Bolivar and snyderi Cau­
dell it is separated because these have horseshoe
plate, and dont possess the double basiconic sen-
sila like scorpion telson in lateral lobes of ter­
gite XI (fig. 2).
C. BOLÍVAR Y PIELTAIN
Luz CORONADO-G.
Laboratorio de Entomología General,
Escuela Nacional de Ciencias Biológicas, I. P. N.
México, D. F.
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