STUDIES IN NEOTROPICAL MALLOPHAGA—CARRIKER 141 
to be of unusual importance in separating the species of this partic- 
ular section of the genus. 
The genital armature was poorly described, owing to the fact that 
the single male (the type) was in poor condition, with the genitalia 
impossible to distinguish clearly or properly interpret. I have since 
secured two fine males from the type host, collected at Samaipata, 
Bolivia, which have been carefully compared with the type. These 
two specimens are a trifle larger, but otherwise identical with the 
type, and a correct delineation of the genitalia has been prepared 
from one of them. The original figure was fairly correct (Carriker, 
1936, pl. 16, fig. 2b) as to the basal plate, and paramers, but the drawing 
of the endomeral plate was very misleading. 
One character of the endomeral plate is not always visible, that 
is, the sac that fills the space between the two lateral prongs and 
that extends distally a varying distance beyond them, according 
to the different subspecies. In some of the races of mandibularis 
there are no strengthening bars of chitin within this sac, while in 
others they are present, while its walls are so thin and transparent 
that they are often very difficult to differentiate. 
The presence in the Mexican material of two races of mandi- 
bularis, two of H. temporalis, and the undescribed species znea- 
pectata, has made necessary a complete revision of the mandibularis- 
temporalis group. The second error in the description of H. mandi- 
bularis was the incorrect description of the chaetotaxy of the 
abdominal pleurites, which now proves to be of vital importance, 
especially the presence or absence of certain short, thickened spines. 
In the male we have the following: Pleurite I has no hairs or spines 
(this enumeration does not include the hairs at the posterolateral 
angle of the pleurite); II and III have one spine and one hair; IV 
and V have three hairs. This arrangement of hairs and spines is 
one of the essential characters for the separation of ail races of H. 
mandibularis from all races of both H. temporalis and H. inexpectata. 
The males of both H. mandibularis and H. inexpectata have the 
crescent-shaped “scent gland” on the fifth abdominal pleurite, while 
H. temporalis has the flower-shaped glands on segments IV and V. 
The females of these three species are separated on the chaetotaxy of 
the abdominal pleurites and tergites and the character of the last 
abdominal segment. We heve the following known races of Z. 
mandibularis : 
HEPTAPSOGASTER MANDIBULARIS MODESTAE, new subspecies 
FicureE 11, 6, ec 
Types.—Male and female, adults, from Crypturellus b. boucardi, 
collected by the author on Cerro Tuxtla, Veracruz, Mexico, March 28, 
1940; in U. S. National Museum. 
