100 procp:eding.s of the academy of [Jan.. 



July 2; Xo. 135, died early in September; No. 137, died early in September; 

 No. 139, escaped June 3; No. 141, died about September 1; No. 143, died Au- 

 gust 6; No. 145, still living; No. 147, died about September 28; No. 149, died in 

 September. 



Mating. — The following were the observed cases worthy of note: 



(1) 9 No. 133. d'No. 132 was introduced at 12.30 P.M., May 27. 

 Most of the time he spent in spinning upon the web. but sometimes 

 approached and touched her, when she either moved away or else 

 shook her legs tremulously. At 3.40 I was obliged to leave, and on 

 my return at 4.33 found them in copula against the bottom of the 

 test-tube. She lay upon her left side wdth her legs flexed close to her 

 body, her abdomen and cephalothorax in one line. He lay upon his 

 right side with his face pressed against the ventral surface of her 

 cephalothorax and his ventral surface turned toward hers, but not 

 parallel with it, the axes of their abdomens diverging at an angle of 

 mor.> than 45°; his first two pairs of legs embraced hers closely, his 

 posterior pairs were directed backward and braced against the web. 

 This male had lost his right palpus; his left he extended backward 

 along the ventral surface of her abdomen so as to hold the palpal 

 organ inserted in her epigynum. This copulation lasted without 

 interruption up to 5.32. Then after she had made two cocoons, on 

 June 4 and 9 respectively, the same male was found in copulation 

 again at 12.59, continuing so up to 1.48, when he left her, and though 

 he returned several times she met him with open jaws, except once 

 when she approached him with closed jaws, shaking her flexed first 

 pair of legs. Then he proceeded to charge his palpus with sperm. 



(2) ? No. 135. d'No. 134 was found at 7.35 P.M., May 27, in copu- 

 lation; the embrace was as in the preceding case, except that their 

 bodies were directed upward. Only the right palpus was used, and 

 that was kept continuously inserted ; a large evaginated sac connected 

 with this palpal organ dilated and contracted 10-11 times a minute, 

 each dilation of it accompanied by a slight jerk of his abdomen. He 

 suddenly left her at 8.09, worked his palpi through his jaws, shortly 

 after fed upon a gnat, and no further copulation was observed up to 

 10.20. On June 13, after she had made three cocoons, they were 

 seen again in copulatory attitude, but his palpi were not inserted. 



(3) 9 No. 141. d'No. 140 was embracing her at 2.00 P.M., May 31, 

 but his palpi, though pressed against her abdomen, were not inserted. 

 The right palpus was inserted continuously from 2.15 to 3.06. He 

 then moved a few millimeters away, and on approaching her again 

 she rushed at him with opened jaws and chased him the length of the 



