Hahits, cti.. of the "Walking-Stick" (Aplopiis iiiaycri). 57 



thorax also continue to live and crawl about in the usual manner for several 

 days after the abdomen has been removed. 



I induced two male aplopi to pair with such a "stick-female" in a per- 

 fectly normal manner (text-fig. i and plate 3. fig. 5). The experiment was 

 performed as follows: It had been found, if a male was separated from a 

 normal female while mating with her, that they would remate after a short 

 time if placed in the dark. It had also been found by a previous unsuc- 

 cessful experiment that the abdomen should be from a female that was 

 mature, but that had not been mated with. This in mind, five males and ten 

 females were put into a dark-room, where after 12 minutes one of the males 

 had paired with a female. The pair was separated and the abdomen of the 

 female cut off at the joint between the first and second segments and fixed 



Fig. 1. Drawing of male Aplopus in full copulating attitude with the end of a female 

 abdomen fixed to a wire-legged stick. 



to the Stick with wire legs as described above. All of the females were now 

 removed from the cage and the abdomen on the wire-legged stick was at- 

 tached to the side of the cage in a vertical position and placed in the dark- 

 room with four males. 



After 1.5 hours the "stick-female" had not been disturbed by any of 

 the males. It was now moved and placed in a horizontal position, as if hold- 

 ing to the gauze-wire top of the cage by its legs, with its body suspended, 

 the attitude of any insect while clinging to the under side of a horizontal sur- 

 face (fig. i). In such a position the abdomen zvas mated zvith in less tlian an 

 hour. The male in this instance was not the same individual that had pre- 

 viously mated with the entire female. He was in a perfectly normal copulat- 

 ing attitude, his organ of intromission being inserted between the oviscapt 

 and the raised end of the female abdomen, as is shown in figure i. Figure 

 5, plate 3. is a photograph of the pair, although here the male has withdrawn 

 his intromissive organ on account of the disturbance caused by shifting the 

 cage into a favorable light for photographing. This male was finally, by the 

 movements of the cage, made to leave the " stick-female." 



