WINGLESS REPRODUCTIVE TYPE OF TERMITES 623 
ocelli. In the place occupied by the frontal gland in other 
castes, a bilobed median ocellus occurs, an interesting reversion 
to the condition found in many insects, or a persistence of the 
embryonic phase of the frontal gland, Kochi (00), Thompson 
(16). The chitin of the head is thick, and since wood is habit- 
ually chewed the jaw muscles are normal and few fat masses 
occur in the head, nor in the abdomen. 
The reproductive system fulfills some but not all of the con- 
ditions necessary for fertility, hence the worker of P. simplex is 
sterile, although approaching the probable ancestral condition 
of fertility. In the females (figs. 17, 35) the ovaries are smaller 
than in either the second or third forms, the contained ova are 
likewise smaller, but on the other hand, they are larger than in 
the workers of the related species, R. flavipes and R. virginicus. 
All three fundaments of the reproductive system are completely 
fused and there is a continuous connection from ovaries to the 
exterior, although evidently without a lumen. The seminal recep- 
tacle is small and the colleterial gland not greatly convoluted. 
In the male, the fusion of the two fundaments has occurred, but 
the growth of the parts, like those of the female, has been arrested, 
so that a non-functional condition is evident for both sexes. 
The soldier of P. simplex. The soldier is found in the nymphal 
and adult phases of development. The adult soldier has a greater 
body length than any of the other castes, measuring 6.5 to 7 
mim. (fig. 18). This is chiefly due to the large, elongated head. 
The head is wedge shaped, the broad surface at the posterior 
end, and darker in color than the body. The number of antennal 
segments in the specimens figured is nineteen, but this number 
frequently varies. The thoracic plates are larger than in the 
worker and the posterior margins are not indented in the median 
line. 
Fig. 19 Prorhinotermes simplex. Mesothoracie wing vestige of nymph of 
the second form. 
Fig. 20 Prorhinotermes simplex. Metathoracie wing vestige of nymph of 
the second form. The venation is similar to that of the wing of the first-form 
adult. sc, subeosta; 7, radius; cu, cubitus. No media is present. Spencer oc. 
6, obj. 16, stage level. 
JOURNAL OF MORPHOLOGY, VOL. 34, NO. 3 
