./ H. Emerton — Spiders of the Family Thomisidm. 365 



spinnerets and epigynnra are each covered by a very dark round spot. 

 The epigynnm resembles that of trir/uttatvs. 



Males from Peabody and Saugus, Mass. Females, Brookline, 

 Mass., S. Henshaw. 



XysticUS formOSUS Banks. 



Plate XXIX, figures 3, Sa. 



The m.ale is 5""" long and the cephalothorax 2-5""" wide. The 

 dark sides of the cephalothorax extend toward the middle behind the 

 eyes so that the middle light portion is narrower than usual. The 

 parts around the eyes are white and so is the back of the cephalo- 

 thorax around the dorsal groove. The hinder ends of the dark 

 bands are nearly black where they pass under the front part of the 

 abdomen. The abdomen is white in the middle with irregular 

 brown spots, and the sides are dark brown, in angular patches that 

 do not extend as far toward the middle as usual. The legs are 

 covered with irregular brown spots and the patella and tibia of the 

 first and second legs are much darker than the rest. PI. xxix, fig. 2. 



The tibia of the male palpus has a very small hook underneath, 

 but the outer process is longer than usual and between it and the 

 inferior process is a wide flat tooth. Fig. 2a. The palpal organ is 

 very simple, the usual pi'ocesses of the bulb being represented only 

 by a very short flat ridge. Fig. 2a. 



Only one male from West Roxbury, Mass. 



XystiCUS quadrilineatUS Keys., Spinnen Americas, 1880. 

 Pl.\te xxix, FiGtJREs 4, 4a. 

 Female '7'"™ long. Cephalothorax 2-5""" wide. In this species the 

 cephalothorax is unusually wide in front. The color is light yellow 

 with light brown markings and black spots. The cephalothorax has 

 four narrow brown stripes, one each side close to the edge, and the 

 others running back from the lateral eyes. There are also two fine 

 brown lines in the middle, sometimes extending from the eyes to the 

 dorsal groove, but usually broken in the middle. There is a brown 

 spot just behind the dorsal groove and two others on the middle of 

 the back, half way between the groove and the middle eyes. On 

 the abdomen there are two black spots at the front end, two in the 

 middle and two near the hinder end, besides several smaller ones 

 along the sides. There are four light brown lines across the hinder 

 half, each with a white line behind it, and there are oblique brown 

 lines alternating with white at the sides. PI. xxix, fig. 4. The 



