6 B. GBA8SI AND A. SANDIAS. 



certain number of Termite nests, each of which extends into 

 several trees ; and it i& impossible in a particular case to 

 decide without great difficulty whether any given examples 

 represent an entire colony, and whether the inmates of a tree 

 destitute of parental forms belong to one community rather 

 than to another. 



c. Anatomical Observations on the Generative Organs 

 and their Connection with the Alimentary Canal. 



Though I have already said a good deal about the substitute 

 and complementary king and queen, it becomes necessary to 

 give certain details about their generative organs, which my 

 investigations prove beyond doubt to be precisely identical 

 with those of the perfect insect. 



I begin with those of Calotermes. The substitute queen 

 possesses a bundle of six ovarian tubes in each ovary (PI. 19, 

 fig. 1), which increase in length concomitantly with her growth 

 in bulk, and eventually become over a centimetre long (PI. 19, 

 fig. 2), whereas those of recently developed substitute queens 

 measure scarcely half a centimetre. As a rule but one tube 

 of each ovary contains a nearly ripe ovum, which is always 

 larger than the most advanced ova of the remaining tubes. 

 The ovarian tubes may occasionally be bifurcated at the lesser 

 (anterior) extremity. Vitellogenous cells are absent, but an 

 ovarian follicle exists. The receptaculum seminis is elongated, 

 and never contains a large quantity of semen. The accessory 

 colleterial glands (PI. 19, fig. 3) are also long ; the oviducts 

 are short. The genital appendices, as we said before, are 

 absent, save in very rare cases, in which they dificr from those 

 of the male by their less proximity to each other. 



All these characteristics, with the exception of the occa- 

 sional presence of the appendices, are met with alike in the 

 true queen. 



The number of follicles which compose each testis of the 

 king is difficult to determine, but is about nine. However, it 

 may confidently be stated not to difl'er in the true and sub- 



