180 THE COCKROACH. 



tortuous, and enlarged towards the middle of their length. 

 The vesiculrc seminales bear many utriculi majores et breviores. 

 The penis is of simple form, and dilated at the end. The 

 titillator is broad, but produced into a slender prong, which 

 projects beyond the penis. A pair of subanal styles is found, 

 but the unpaired booklets are wanting or very inconspicuous. 



Fig. 103. The Tenth Tergiim reflected to show the external male organs in situ. 

 T 10 , tenth tergum ; p, podical plates ; A F, as in fig. 102 ; 8, sub-anal styles. 

 X 8. 



Yery little is known about the act of copulation among Cock- 

 roaches, and the opportunities of observation are few. The 

 following account is given by Cornelius (loc. cit., p. 22) : 



" The male and female Cockroaches associate in pairs, the females being 

 generally quiet. The male, on the contrary, bustles about the female, 

 runs round her, trailing his extended abdomen on the ground, and now 

 and then raises his wings. If the female moves away, the male stops the 

 road. At last, when the female has become perfectly still, the male goes 

 in front of her, brings the end of bis abdomen towards her, then moves 

 backwards, and pushes his whole length under the female. The operation 

 is so rapid that it is impossible to give an exact account of the circum- 

 stances. Then the male creeps out from beneath the female, raises high 

 both pairs of wings, depresses them again, and goes off, while the female 

 usually remains quiet for some time." 



