68 Journal Xew York Entomological Society, t^'o'- ^i^- 



Variations in Structure and Color. — In order to study the 

 variation in size, color and markings of this species, the following 

 data are given in regard to the various collections obtained and 

 examined. 



Specimens Collected at Portage, Wis. — Two specimens, a male and 

 a female, collected from under the bark of a conifer September i, 1909, 

 by the writer; and one male collected from a similar situation Sep- 

 tember 2, 1909. 



Color: palpi very dark, hand darker than the other segments; 

 cephalothorax dark. 



Tooth-like projections present on the cephalothorax, but not pres- 

 ent on the palpi. Movable digit of chelicerje but slightly curved; 

 spinneret stout, straight, with five subequal barbs at its distal end. 



Length : 2.8 mm. 



Specimens Collected at Ames. la.- — Many specimens, mostly col- 

 lected by the writer in 1909 and 1910 in various situations. Many 

 individuals were collected from under the bark of a single white oak 

 (Quercus alba) which was badly infested with ants. Several hun- 

 dred individuals were on this tree, the infestation being the most 

 ■extensive 1 have ever observed. 



Color: palpi dark, also the cephalothorax. 



Cephalothorax in the case of nearly every specimen entirely with- 

 out tooth-like tubercles, but in the case of a few individuals very 

 small ones are present. They are absent from the palpi. Movable 

 digit of chelicerse strongly curved. 



Length: 2.5 mm. 



Specimens Collected at Hai'ana, III. — Three individuals, a male 

 and two females, all collected from under the bark of trees standing 

 in the shallow water of Illinois River at the point of its junction with 

 Spoon River. The ancestors of these individuals probably were car- 

 ried down to this point on drift wood from regions farther north. 



Color: palpi and cephalothorax very dark, the hand darkest. 



Cephalothorax without tooth-like process in the case of two indi- 

 viduals; one individual, a female, has some small ones on the cephalo'- 

 thorax. Palpi without tooth-like processes. Movable digit of che- 

 licerae strongly curved. 



Length : 2.5 mm. 



Specimens Collected at Urhana, 111. — Several specimens collected 

 by Dr. J. W. Folsom and by the writer, mostly from under bark. 



