WINGLESS REPRODUCTIVE TYPE OF TERMITES 615 
About all that can be said of the nymph of the first form is 
that the wing pads resemble those of a young first-form nymph 
of Reticulitermes, and are totally unlike the peculiar fused wing 
pads borne by the second-form nymph of P. simplex. 
The winged adult of P. simplex has a body length of 5 mm., 
or 9 to 10 mm. to the tip of the wings. The general body color 
is a light reddish brown. The wings (fig. 14) have a venation 
quite similar to those of R. flavipes in that the two veins of the 
costal areas, subcosta, sc, and radius r, are chitinized, though 
those of the remainder of the wing are almost without chitin. 
The media is lacking in both wings, though possible traces of 
it may be recognized in the network of fine branches between 
CU. 
I4 
Fig. 14 Prorhinotermes simplex. Fore wing of first-form adult, broken off 
at the humeral suture, h.s. sc, subcosta; 7, radius; cu, cubitus. No media is 
present. Spencer oc. 6, obj. 32 mm., stage level, reduced one-half. 
the radius and cubitus, cu, especially in the hind wing. The 
two wings differ slightly in the venation, the presence of a ‘radial 
sector’ (r 4 + 5) in the hind wing and its absence in the fore wing 
being the chief difference. 
The characters most worthy of note in the deilated adult of 
P. simplex (fig. 13), are the relatively small head and large com- 
pound eyes, the prominent opening of the frontal gland, the 
eighteen-jointed antennae, the ‘scales’ of the deilated wings, the 
two heavy veins of the costal margin still visible, and the enlarged 
abdomen. No sections or very successful stained whole mounts 
could be made with the available material, but it was seen that 
the brain is larger than that of the second-form nymph, and the 
same is true of the sex organs. 
