544 ERNEST WARREN. 



(cf. nasal epithelium, lateral line sense-organ) there is a 

 remarkable association of gland-cells and sensory elements ; 

 and certain gland-cells mixed with the sensory cells were 

 detected beneath the olfactory pits (PI. XYll, fig. 23). With 

 the available material and the technique employed it was not 

 possible to determine the exact histological structure of these 

 organs. In the case of the supposed larva, the so-called 

 "^ olfactory tooth" (which may be really auditory in function) 

 on the antenna showed ver}- clearly the presence of large 

 gland-cells alternating with sensory cells (fig. 23a, g. c). 



V. THE SUPPOSED LARVA OF PARACO ROTOC A. 



This larva is found in company with the young of the 

 termites. It is probably produced viviparously, since free eggs 

 were never seen, and the smallest larva met with measured 

 about '75 mm. It is presumed that it is born at this size or a 

 little smaller, but doubtless it is not so large immediately on 

 hatching from the egg in the body of the mother. It must 

 be further remarked that in the largest eggs found in the 

 female Paracorotoca no definite egg-shell was present, and 

 ■this fact favours the presumption that eggs are not laid. 



The larvas are much easier to find than the iiiiagos, and 

 they are very certainly much more abundant (PI. XX, 

 figs. 82, 83). 



It is not proposed to describe the various instars ; but 

 some account of what appears to be a full-grown larva will 

 be of interest in this place for comparison with the anatomy 

 •of the imago of Paracorotoca. 



1. ExTEf?NAL Morphology. 



Length. — Total length of largest larva found about 6 mm. 



Colour. — Young larvae milk white, older larvfe pale yellow 

 on those parts where chitinisation becomes fairly dense. 



Head. — Viewed from in front widely egg-shaped in outline, 

 vertically directed, ventral contour completed by the large, 

 •curved pointed mandibles. Labrum, clypeus, frons and genae 



