ORIGIN OF CASTES OF TERMITES 



117 



small ovary of the worker-soldier type, the oviduct is smaller, 

 the ovarian tubules less numerous and more slender, and the 

 egg cells are smaller than in either of the reproductive types. 



Figure 28 represents a testis from a male of the reproductive 

 type with large brain and large testes. The testis has the 

 appearance of an irregularly swollen tube, with about eight 

 swellings, or lobules. At its posterior end the testis is continued 

 backward into the very slender sperm duct. The male germ 



t 8. 



Fig. 5 Male nymphs of L. flavipes, with ten antennary segments, body length 

 1.3 to 1.4 mm. A, reproductive type of the first form, with large brain and large 

 testis; b, worker-soldier type, with small brain and very small testis, ts, testis. 

 Oc. 6, obj. 16, reduced one half. 



cells at this age are all small and of similar size; I can make no 

 statement in regard to their cytology. Males of the reproductive 

 type of this age with smaller brains have also smaller testes, but 

 these have not been figured. Figure 29, represents the testis 

 of a worker-soldier individual, and is smaller in bulk than that 

 of either of the reproductive types; the sex cells however appear 

 equal in size to those of the reproductive types. 



Since the two groups of individuals of the reproductive type 

 are constant and do not intergrade, it is evident that they must 

 be the prototypes of the two well known kinds of older reproduc- 



