114 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Linyphia clathrata Westr. 



Moult. — At 6.40 P.M., May 7, I dropped a male of this species on to 

 the floor of a cage, and after a few minutes he fell upon his left side 

 and commenced to moult. His palpi and all four pairs of legs were 

 held straight at right angles to his ventral surface. The whole process 

 lasted somewhat less than five minutes. The old skin split by a hori- 

 zontal break, just below the eyes anteriorly, and on the sides just 

 above the legs and along the sides of the abdomen; thus it opened in 

 two pieces, a dorsal and ventral, which remained connected together 

 by a narrow §trip close to the spinnerets. His repeated jerking 

 flexions of the cephalothorax gradually freed first his cephalothorax, 

 then his legs and abdomen. After the moult he rose to his legs, but 

 was unable to walk until the expiration of 16 minutes. 



Pholcus phalangioides Fues-sl. PL IV, fig. 3. 



Individuals observed, males: No. 87, captured May 16 on the web of $ No. 86, 

 killed by 9 No. 82, May 27; No. 88, captured May 17, killed by female No. 12 

 the same day; No. 175, captured June 5, died June 7; No. 180, captured June 7, 

 escaped June 16; No. 245, captured June 23, died June 26. 



Individuals observed, females: No. 9, captured April 29, still living; No. 12, 

 captured April 29, died August 15; No. 15, captured May 1, moulted May 24, 

 still living; No. 82, captured May 15, moulted May 22, still living; No. 86, cap- 

 tured May 16 (on the same web with cJ* No. 87), killed May 31, and immature 

 at death; No. 174 captured June 5 (with a cocoon), died July 5; No. 179, cap- 

 tured June 7. died June 25 (from starvation) ; No. 181, captured June 7, died 

 August 7. 



Mating. — The following data include the more important observa- 

 tions : 



(1) ? No. 9. On June 5, at 12.49 P.M., after she had been well fed, 

 6^ No. 175 was placed on her web. He first remained quiet, then 

 touched her with his legs; at 12.56 she reached toward him and he 

 fell from the web. At 1.06 he climbed into the web, and she moved 

 toward him. At 1.25 he hung below her and touched her fore-legs 

 with his, when she drew her legs away, he continuing to stretch out 

 his first pair of legs toward her. She had in the meanwhile drawn up 

 to herself a former enshrouded victim, and this intervened between 

 them when, at 1.43, he tried to embrace her, so that he removed it 

 and touched her head with his chehcera. She hung perfectly motion- 

 less in her usual position, her abdomen above her cephalothorax and 

 directed vertically upward. The position of his body was the same, 

 but his legs were outside of hers. At 1.47 he inserted both palpi at 

 once, and hung to her by them, his weight puUing her abdomen into 

 the horizontal plane. The position of the two in copula was then as 



