1903.] NATURAL SCIENCES OF PHILADELPHIA. 123 



her each time. On May 15 he completed his final moult, but on the 

 next day he avoided her again; this would show that sexual ardor 

 may not show itself in the male immediately after the final moult 

 On May 17 they were put together at 8.00 P.M. Both remained 

 perfectly quiet within an inch up to 8.57, when she moved toward 

 him with her first two pairs of legs outstretched; he quickly reached 

 out his corresponding legs, seized the feet of her right fore-legs with 

 his right fore-legs, and holding them thus (only the metatarsi in contact) 

 he quickly revolved around her and climbed upon her back from be- 

 hind. She immediately became immobile with her legs flexed close to 

 her body. He turned about upon her back, holding her with his legs, 

 and feehng her with his palpi. At 9.02 he reached his head downward 

 over the posterior end of her abdomen, placed the ventral surface of 

 his cephalothorax against the ventral surface of her abdomen so that 

 his head was posterior to her epigynum, his abdomen accordingly 

 extending behind hers and tilted upward; his third and fourth pairs 

 of legs held tightly to her abdomen, while his first and second pairs 

 were directed forward to embrace her legs. One palpus at a time he 

 then extended straight forward and applied to her epigynum. The 

 number of palpal appUcations was, using the abbreviations r and I 

 for right and left respectively, the first numbers expressing the time 

 extent, the second the number of insertions: r, 9.08-9.12, 8; 1, 9.12- 

 9.13^, 6; r, 9.13^-9.36^, 9, the last time inserted continuously from 

 9.21 to 9.36^. The black spine connected with the palpal organ was 

 pressed into her epigynal aperture, and when so inserted an evagi- 

 nated sac connected with the concave surface of the organ expanded 

 and collapsed after the withdrawal of the palpus from the epigynum; 

 before another insertion the palpal organ was drawn through the 

 chelicera. At 9.38 he moved half an inch away, and she rose suddenly 

 at 9.41. 



The same 9 , No. 4, copulated several times with this male. No. 5 

 On each occasion their attitudes were the same. The following notes 

 give concisely the duration of time and the number of applications of 

 the palpi, as well the mode of approach of the male. 



(1) May 18, as soon as he touched her he immediately mounted upon 

 her back, at 12.09 P.M.; palpi applied as follows: r, 12.16^-12.21, 9; 

 r, 12.21-12.31^, inserted continuously. Then he walked half an inch 

 away, returned and copulated again; r, 12.37-12.41, 2 or 3; he then 

 left and again tried to return, but she repulsed him. 



(2) May 19, by touching him I brought him in contact with her 

 he mounted her, and made the following palpal applications : 1, 8.28- 



