1909.] NATURAL SCIENCES OF PHILADELPHIA. 561 



for a few seconds, when she suddenly rose and he jumped away. She 

 moved slightly after each palpal withdrawal, and he quieted her by 

 rapid tapping with his fourth leg pair. On 7 August he died from her 

 bite. 



Geotrecha pinnata Emerton. 



One male and three females were found running in an oak wood on 

 31 July and placed in a large cage. Two copulations were observed 

 on that day and on the next respect ivefy, the attitude being the same 

 as in G. crocata. In the first case the male inserted his palpi each twice 

 and successively from 5.42-5.43 P.M., then he turned away from the 

 female, returned and inserted the right palpus for a few seconds, 

 turned away, returned and inserted each palpus once, moved off, 

 returned and inserted both once, then moved away from her again ; 

 but when he sought her again at 5.51 she had gone off. What is 

 remarkable in this species is that the male, after one or two short palpal 

 insertions, departs an inch or more from the female, stands still for a 

 minute or more shaking his palpi, then turns and seeks her again 

 (wholly by touch unaided by sight), the female generally waiting 

 motionless for his return. He alwa} r s mounts over her head. The 

 next day the same male copulated in a similar fashion, from 11.35- 

 11.44 A.M., with eight palpal insertions. 



On 22 July five other individuals of this species were caught and 

 placed in one large cage. Two were males, one of them lacked one 

 palpus, and for convenience may be called A, while the other perfect 

 individual we ma} T call B; these males were combative on meeting 

 each other, but not aggressive to the females nor these to one another. 

 d 1 B at 5.20 P.M. met and copulated with a gravid female, inserting 

 his palpi about four times; then cT A touched her, she at first repulsed 

 him but half minute later accepted two palpal insertions from him; 

 at 5.36 both males were an inch away from her. Between 5.37 and 

 5.50 she received both males in the following order: C? A, c? A, cT B, 

 c? A, c? B, cT B, cT B, d 1 A, o 1 A. Then she rose and moved away, 

 returned to the same place, and repulsed further advances. After 

 cleansing herself she began at 7.20 P.M. to spin her cocoon. Between 

 8 and 9 P.M. she was interrupted by o 1 A five times, but drove him 

 off each time. At[9.06 cJ 1 B found her and copulated, and between then 

 and 9.15 copulated eight times. Between 9.22 and 9.35 cT A made 

 five advances, but was driven away each time. cT B copulated twice 

 at 9.42, and at 9.44 she repulsed d 1 A. I then kept both males away 

 from her in order to see the cocooning. This is a very remarkable 

 case of a female accepting copulation from two males alternately; 



