1903.] NATURAL SCIENCES OF PHILADELPHIA. 63 



flexed her legs closer to her sides and, so to speak, cowered before 

 him. Then from in front he walked over her head, and embraced 

 her tightly with his three anterior pairs of legs; his head was pointed 

 toward her posterior end and just above the pedicel of her abdomen. 

 In the copulation he would turn his cephalothorax first a little to one 

 side of her body, then to the other, throwing both palpi over that side 

 of hers to which he had turned. When his head was turned toward 

 her right side, his right palpus would be stretched down along the 

 right side of her abdomen and inserted in the epigynum ; when toward 

 her left side, the left palpus would be inserted. Thus to alternate 

 the palpi he had each time to shghtly change his position upon her, 

 but the grip of his legs remained unchanged. Each palpus would be 

 rubbed against her epigynum until inserted, then kept there until an 

 invaginated swollen sac of the palpal organ had collapsed, a period 

 not exceeding twenty seconds, when the palpus would be withdrawn 

 and rubbed between his chelicera. The following palpal insertions 

 were made, the abbreviations r and I being used for right and left palpus 

 respectively, the first numbers giving the time extent, the second the 

 number of insertions into the epigynum: r, 2.1S-2.20, 3 or 4; 1, 2.20- 

 2.21, 5; r, 2.21-2.28^, 4; 1, 2.28^-2.31^,7; r, 2.3U-2.38i, 6; 1, 2.38i- 

 2.53i, 15; r, 2.53^-3.01, 9; 1, 3.01-3.11, 7; r, 3.11-3.19, 6; 1, 3.19-3.26, 

 5; r, 3.26-3.30, 3; 1, 3.30-3.36i, 4; r, 3.36i-3.38, 4; 1, 3.38-3.42+, 3; 

 r, 3.42^3.46, 3; 1, 3.46-3.50^, 3; r, 3.50^-3.59, 4; 1, 3.59-4.04, 3; 

 r, 4.04-4.07, 2; 1, 4.07-4.12, 2; r, 4.12-4.18*, 3; 1, 4.18^-4.23+, 2; 

 r, 4.23+-4.26, 1 ; 1, 4.26-4.28, 1 ; r, 4.28-4.31, not inserted once. Then 

 he rose and moved away and was taken from the cage; she remained 

 motionless for several minutes afterward in the same attitude; her 

 only movements during the copulation was to flex the side of her 

 abdomen upward to meet the palpus applied. This copulation lasted 

 2 hours and 13 minutes. At 7.40 P.M. on the same day he was put in 

 again, but she received him hostilely with upraised fore-legs. On 

 May 29, when introduced, he courted again, but she was hostile, and 

 this was repeated on May 31. 



(2) 9 No. 51 was immature, and was very aggressive toe? No. 41, 

 whom she killed on the last occasion; he had made no courting move- 

 ments. As other females of this species, when she is hostile to a male, 

 with uplifted fore-legs she moves very slowly and stealthily toward, 

 then makes a quick rush at the male. 



(3) 9 No. 165 killed on May 31 d No. 164, after courtship, c? No. 

 151 was introduced on June 2, but though he courted at first, he soon 

 ceased by reason of her aggressiveness. On June 3 the same male 



