1903.] NATURAL SCIENCES OF PHILADELPHIA. 79 



legs held outstretched before him and elevated only slightly from 

 the ground. This is an action of neither aggression nor fear; aggres- 

 sion is evidenced by standing high upon the legs and stretching 

 out the first pair of legs without shaking them ; fear, by holding the 

 body low, and flexing the first pair of legs at the tibial joint back over 

 the cephalothorax. 



(2) ? No. 196. cJ" No. 201 was put in her cage at 4.47 P.M., June 12. 

 At 6.00 P.M. they faced each other at a distance of about 50 mm. ; his 

 body was flat upon the ground, and at intervals he raised his fore-legs, 

 which were stretched out on the floor before him, and shook them 

 tremulously in the air. After several repetitions of this movement 

 he approached her slowly and touched her, making a short step for- 

 ward with each shaking of his legs, but she rebuffed him. 



Cocooning. — The following cases of normal cocooning were seen: 



(1) 9 No. 183 had been caught in a test-tube, and before she was 

 removed to a cage she had made her cocoon there. At 1.10 P.M., 

 when first noticed, she had already laid her eggs upon a silken cocoon 

 base, the diameter of which about equalled the length of her body, and 

 was then spinning the cover by brushing the spinnerets from side to 

 side, at the same time rotating her body over it. From 1.21 to 1.23 

 she occupied herself with biting the margin of the lenticular cocoon 

 loose from its scaffolding At 1.25 she held the cocoon beneath her 

 cephalothorax, when she was placed in a larger bowl for better obser- 

 vation. There she walked about with it attached to her spinnerets 

 until 1.28, then held it beneath her cephalothorax again with the use 

 of her third pair of legs, and Avhile rotating it with her chelicera 

 and palpi she spun upon it with the abdomen bent downward. This 

 continued until 1.55, when she attached the now round cocoon to her 

 spinnerets. 



(2) 9 No. 196, on June 14, at 5.45 P.M., commenced spinning on 

 the floor of the cage with many interruptions and uncertainly. At 

 6.55 she commenced again in a corner of the cage, brushing her spin- 

 nerets over the floor and the wall, and turning her body sometimes 

 from right to left and sometimes in the reverse direction. Gradually 

 her spinning became more regular, with fewer pauses, and she con- 

 structed a nearly circular sheet of close web elevated from the floor 

 to the wall and with a central depression extending to the floor. Up 

 to 7.37 she spun upon this foundation the base of the cocoon, a white, 

 circular, disk a little less in diameter than the length of her body, this 

 base (like the supporting scaffolding) rising from the floor to the wall 

 at an angle of 30°. Then from 7.37 to 7.54 she occupied herself 



