1903.] NATURAL SCIENCES OF PHILADELPHIA. 69 



the night of May 18, but there was no attempt at mating; this was 

 repeated during two hours on the following night, as also on May 28 

 and May 31. At 8.10 P.M., June 3, the same male was again intro- 

 duced. She moved about at intervals, he avoiding her, up to 9.12. 

 Then I chanced to look at another cage for half a minute, and when 

 I looked back found the pair in copula. The position was the one 

 usual for this genus, he above her with his head pointed toward the 

 posterior end of her abdomen and his three anterior pairs of legs holding 

 her tightly; his first patellse were just behind her fourth femora, his 

 second patellae behind her third femora, his third patellae behind her 

 second femora. Only one palpus was inserted at a time; when his 

 right palpus was used his head was turned obliquely over the right 

 side of her body; when his left was used, over the left side. The 

 sequence of usage of the palpi, the time, extent, and the number of 

 times each was inserted before the other was used, was as follows 

 (using the abbreviations r and I for right and left palpus respectively) : 

 r, 9.13-9.13^, the number of times not noted; 1, 9.13^-9.14^, 3;r, 

 9.14^-9.15^, 3; 1, 9.15^-9.17, 4; r, 9.17-9.19, 5; 1, 9.19-9.21, 4; r, 9.21- 

 9.23i 5; 1, 9.23i-9.26f, 6; r, 9.26|-9.29, 5; 1, 9.29-9.33, 6; r, 9.33-9.37, 

 4; 1, 9.37-9.41, 5; r, 9.41-9.43, 2; 1, 9.43-9.47, 3; r, 9.47-9.50, 3; 1, 

 9.50-9.53, 2; r, 9.53-10.02, 4; 1, 10.02-10.04^, 2. He made each palpal 

 insertion by reaching the palpus down and rubbing it against her 

 epigynum, and while it M'as inserted a large sac evaginated from the 

 side of the palpal organ; the palpus was kept inserted until this sac 

 collapsed, a period of about 15 seconds in the earlier part of the copu- 

 lation, and of 30-40 seconds in the latter part; then the palpus was 

 withdrawn and rubbed against his mandibles. At the end of the 

 copulation (which had lasted 52 minutes) the male rose and walked 

 off, immediately proceeding to the act of sperm-induction. 



(2) 2 No. Ill was immature, and when cT' No. 110 was placed with 

 her they avoided each other. 



(3) ? No. 171. (J No. 170 was placed in her cage May 31, and again 

 on June 1 and 3, but no mating followed. On June 7 the same male 

 was introduced at 8.49 P.M. From then until 8.51 they were motion- 

 less with their legs touching, when each backed off a little, he then 

 in his characteristic attitude of defense, with his first pair of legs 

 drawn up and back so that their patellae touched the top of his ccpha- 

 lothorax. At 8.52 he quivered these legs, she made a step toward 

 him, then both remained still with uplifted fore-legs. At 8.54 she 

 made another short step toward him, not aggressiA'ely, i.e., without 

 uplifted fore-legs, but he backed off a little as before. At 8.55 he 



