168 MR. p. M. CAMPBELL ON THE 



onl)'- data I have are not sufficient to form a couclusion as to the 

 T. Guyonii; but out of ten young ones cauglat in July aud 

 August, seven now show the swollen palpi of an immature male. 

 On a few occasions during the pairing-season I have found 

 a male on the top of a cob on which was a recently cast exuvium, 

 while the owner, an immature female, had retreated below. In 

 one case the semen was protruding from the abdominal sexual 

 organ of the male. Thinking that some light might be thrown 

 on the probable case of parthenogenesis in this species (Journ. 

 Linn. Soc, Zool. vol. xvi. p. 536), I removed the pair to separate 

 vases, and after a few days put them together. The male at once 

 (Aug. 19th, 10 A.M.) began to pay his addresses. Shortly after- 

 wards he rapidly applied one of his palpi to the female in the 

 manner already described, and apparently with her consent. At 

 3 P.M. he charged her, tore away two legs below the trochanter 

 and began to suck one, using the mandibles to hold the limb 

 just as a human being would a stick of asparagus. The female 

 died an hour afterwards. The sexual parts were much deranged, 

 and the opening of the oviduct exposed ; but she required 

 another moult to be mature. Fig. 23 represents the state of the 

 undeveloped bursse copulatrices * denuded of hairs. There were 

 no more chitiuous parts than those coloured red. The prolon- 

 gations (fig. 21, C B*, C B) of the chitinous plate, which in the 

 mature stage pass forwards to the spermatheca, were only re- 

 presented by a narrow fold of skin ; while the spermatheca were 

 but recognizable as small cones without any convolutions about a 

 fourth of the mature length. I carefully examined for sperma- 

 tozoa, but could find none. I have now in confinement two 

 females which, when in a similar immature stage, were placed 

 with males ; but the season has not arrived for knowing the result. 

 In neither case did I observe anything but a very laggard court- 

 ship on the part of the males. 



"Wishing to see how the males would act, I placed three of 

 them on different occasions in a glass vase in which were only a 

 cob and a recently cast exuvium of a female in its natural posi- 

 tion. It was interesting to see them searchiog for something as 

 soon as they felt the threads. Having found the exuvium, they 

 cautiously felt below the web with their legs, as if to see whether 



* The female sexual organ, immediately after maturity, is not so chitinous 

 as fig. 21, and somewhat resembles fig. 23 ; but all the parts are developed, 

 which was not the case with the above spider. 



