CASTES OF TERMOPSIS 521 



soldier, and is shown in figure 19, tf. The oviducts are broad 

 and, in some individuals, are completely fused with a small but 

 well-formed seminal receptacle; in other individuals the oviducts 

 have not grown together with the seminal receptacle. The 

 colleterial gland is greatly convoluted, but the individual tubules 

 are slender. It will be seen from the foregoing description that 

 many of these young soldiers seem to give promise of fertility in 

 the adult phase. The adult female soldier is, on the contrarj', 

 undoubtedly infertile. The reproductive organs of a large num- 

 ber of adult females have been dissected out after staining and 

 other individuals have been sectioned. In every case there is 

 evidence of the arrested development of the female reproductive 

 organs, either of the ova alone or of the ova and the ducts. In- 

 stead of the well-rounded ova, regularly spaced and with large 

 central nuclei, that were present in the soldier n^miphs (fig. 20), 

 we note in the adult soldiers, shrunken eggs, irregularly spaced 

 with respect to one another and with smaller nuclei at one end 

 of the cell body (fig. 21). Furthermore, many adult individuals 

 were found in which the three embryonic fundaments of the 

 oviducts, the seminal receptacle, and the colleterial gland, had 

 failed to unite during development (fig. 18), so that the three 

 parts were entirely separate, which is always the case in the sterile 

 soldiers and workers of Reticuhtermes and Prorhinotermes where 

 reproduction is impossible (Knower, '01; Thompson '20). Two 

 degrees of infertihty, therefore, exist among the adult female 

 soldiers of Termopsis angusticollis : 1) individuals in which the 

 oviducts, the seminal receptacle, and the colleterial gland are 

 fully fused, so that sexual intercourse might be possible, but whose 

 ova have undergone an arrest in development (fig. 19) ; 2) individ- 

 uals without fusion of the above-mentioned ducts, so that sexual 

 intercourse would be impossible, and in addition an arrested de- 

 velopment of the ova (fig. 18). 



In the young female soldier with wing pads found at Pacific 

 Grove, the ova were as yet normal, but the three fundaments of 

 the reproductive system were not united, so that this specimen, 

 if it had lived, would have fallen into the second category of 

 infertile female soldiers. 



