WHEELER— ANT LARV.E. 



307 



this stage they are uiichitinized and therefore iionfunctionaL The 

 coarse hairs are visible on the dorsal surface but a more uniform 

 investment of small hairs has made its appearance. They are blunt 

 or even clavate, especially on the prothoracic segment. In this and 

 the trophidium stage I am unable to find any salivary glands in 

 cleared preparations though rudiments may, perhaps, be present. 



Fig. 8. A, second, B, third and C, fourth (adult) larval stages of Pachysima 



ccthiops F. Smith. 



The third stage larva (Fig. 85) is larger and very regularly ellip- 

 tical. The exudatoria can all be recognized, except the unpaired 

 tentacle. It is, however, present in some of the younger individuals 

 but in a greatly reduced and vestigial condition and at the bottom 

 of the deep depression which now appears as a definite pocket just 

 back of the mouth and under the midventral swelling of the first ab- 

 dominal segment. In many larvae I found in this pocket a small, 



