618 CAROLINE B. THOMPSON AND THOMAS E. SNYDER 
deeply pigmented compound eyes. The lateral ocelli are also 
large, and in surface views such as that from which figure 15 
has been drawn, the lateral ocellar nerves are clearly seen curving 
in toward the frontal surface of the brain. The frontal gland 
is present and is evidently of a glandular nature, but not yet 
functional. In some specimens it appears bilobed. 
The reproductive system, although still immature, is larger 
than in any other caste of similar age.t In the female (figs. 15, 
33) the ovaries are large and stout and contain fairly large oblong 
ova; these again are larger than the ova of the third reproductive 
form. The oviducts are wide with an evident lumen, the vaginal 
duct is wide with convoluted inner surface, and is open to the 
exterior. The seminal receptacle is large and well developed, 
and the colleterial gland is greatly convoluted. This nymph 
fulfills the three criteria of fertility for a female termite: 1) the 
size of the ovaries; 2) the complete fusion of oviducts, vaginal 
ducts, and colleterial gland; 3) the size of the seminal receptacle. 
It will be seen below that some sterile females may fulfill one 
or even two of .these requirements, but not all three. 
In the male (fig. 37) the testes are of fair size and slightly 
lobed, and the seminal vesicles show signs of growth. The 
specimen shown in figure 37 gives evidence of being a young but 
fertile male. 
The third form of P. simplex 
The third form of P. simplex occurs in three phases: the 
nymphs, the young adult, and the enlarged adult. In Florida 
colonies, this form is very common and abundant. 
The young and enlarged adults are easily recognized by the 
absence of wings, the size, 6 to 7 mm. long, the dark brown body 
pigment, and the distended abdomen. The young and nearly 
mature nymphs, however, are distinguished from workers with 
some difficulty, for there is here the same superficial resemblance 
as in the similar castes of R. flavipes, and, like these again, the 
many minute structural points of difference (table 2). 
4 The Jamaican first-form nypmhs examined were not in condition to show the 
finer details of structure of the reproductive system, so that they are not included 
in the present comparison. 
