CONSTITUTION AND DEVELOPMENT OF TERMITES. 271 
without appendices should it be a female. The other impor- 
tant ecdysis is that in which the larva of a substitute royal 
form loses its genital appendices if a female, and this leads 
us to a detailed consideration of the latter organs. 
The genital, often wrongly termed the anal appendices,! are 
homologous with those of the ninth abdominal sternite of 
Thysanura, and are attached in Termitide to what is appa- 
rently the eighth, but is really the ninth sternite, the first 
being fused with the metasternum. They possess hairs which 
do not differ from the ordinary hairs scattered over the body. 
They are present in all sexually immature examples, but 
in the males only when mature. Further, the sternites differ 
in the sexes ; in the female the true (not the apparent) seventh 
sternite is strongly developed and semicircular, and the true 
eighth and ninth are small and possess a median fissure. In 
the male the true seventh is rather small, as are the true eighth 
and ninth, in which the fissure is wanting. ‘There is no penis. 
I have but little to say about the internal organs. The 
tracheal system agrees with Fritz Miiller’s description,’ and I 
have likewise observed the stigmata, tracheal trunks, anas- 
tomoses, &c. Further, this species exhibits the blind tracheal 
branches figured by Miiller, which I take to be suppressed 
trunks or tracheal vesicles. 
The alimentary canal presents the following features. In 
newly born larve the teeth of the proventriculus are colour- 
less and quite soft,—that is, covered as yet with a delicate 
cuticle; and the Malpighian tubules are four in number. 
Four others appear at the epoch when the antennez possess 
eleven distinct joints, of which the third and fourth are 
glabrous, and the former shows traces of division into two; 
these new tubules require a certain time in which to attain 
the size of the original four, and I have found them to be still 
1 [The genital appendices must not be confused with the abdominal appen- 
dices or cerci, referred to on p. 268.—W. F. N. B. | 
2 [‘Jen. Zeitschr.,’ ix, pp. 257, 259, pl. xiii.] 
