390 CAROLINE BURLING THOMPSON. 



that they are the newly hatched forms. These specimens meas- 

 ure from i to 1.2 mm. in length, and have twelve antennal 

 segments, the third segment being deeply grooved or subdivided. 

 Like the very young nymphs of the other termite genera de- 

 scribed above, these young nymphs of A. fumosus are externally 

 all alike but are differentiated internally into (a) the reproductive 

 nymphs, with large brain and large sex organs (Fig. 7, a), and 

 (b) the worker-soldier nymphs, with small brain and small sex 

 organs (Fig. 7, b}. An unusually long slender labrum is present 

 in both types of nymphs, and is characteristic of the three genera 

 of this family here described. 



The older nymphs of A . fumosus, about 2 mm. long, or less, are 

 differentiated into the "small-headed," large-brained, repro- 

 ductive type, and the "large-headed," small-brained worker- 

 soldier type. My material was not very abundant, but was 

 sufficient to show that the early development of A. fumosus is 

 similar to that of the other termites here described. 



Amitermes tubiformans Buckley. The eggs of A. tubifor- 

 mans measure from 0.56 to 0.64 mm. in length (Fig. I, g). 



FIG. 8. Amitermes tubiformans, newly hatched nymphs, a, head of reproductive 

 nymph; b, head of worker nymph. Oc. 6, obj. 16, reduced one third. 



The youngest nymphs examined are from 0.95 to i. mm. long, 

 and have antennse with eleven segments, the third segment bare, 

 but subdivided into two parts. One of these nymphs had a 

 piece of the egg shell still adhering to the abdomen, so that they 

 are evidently the newly hatched forms. 



The newly hatched nymphs of A. tubiformans are externally 

 all alike, but are differentiated internally into (a) reproductive 



