360 J. n. Emerton — Spiders of the Family Thomisidce. 



of the upper Cayuga Lake basin (Ithaca, N. Y.), with descriptions 

 of many new species. Mr. Banks has let me examine liis spiders 

 and his names have been used for several species. 



Xysticus. 



The body is short and flat. The cephalothorax is as wide as long, 

 nearly square in front and half as wide across the eyes as it is at the 

 widest part. 



The front row of eyes is almost straight and the four middle eyes 

 form a square or a rectangle wider than long. 



The abdomen is not much larger than the cephalothorax, widest 

 across the hinder half and not pointed behind. The legs are short in 

 the females, the first and second pairs nearly equal and longer than 

 the third and fourth which are also of nearly the same length. The 

 males have the legs longer and the first and second pairs proportion- 

 ally longer than the females. 



The males are a little smaller than the females and darker colored. 

 The male palpi are short. The tibia has a short simple process on 

 the outer side and a crooked and more complicated one underneath. 

 The tube of the palpal organ begins on the inner side of the tarsus 

 and extends around the bulb to the outer side where it rests in a 

 small thin process turned outward. On the under side of the bulb 

 are two processes of various shapes in different species. 



The epigynum has a rounded opening variable in shape even in 

 the same species, sometimes simple and sometimes divided by a 

 median ridge. 



Xysticus limbatUS Keys., Spinneu Americas, 1880. 



Tlie female X. crudelis Banks, and X. hrunneus Banks, appear to be this species, 

 but the male X. limhatus Banks is different from my X. Jimhaius and nearer 

 the male X. limhatus Keyserling. 



Plate XXVIII, figures 1-1 A. 

 This is one of the largest species, the females measuring 8 or 10""" 

 long and the cephalothorax 4"'"^ wide. 



The colors are light brown spots of various shades on a nearly 

 white ground, some individuals being ver}^ pale and others nearly 

 covered by the brown spots. In half grown individuals the mark- 

 ings are most distinct and are like those of Hentz's figure of Thom- 

 isus ferox which is very likely this species, PI. xxviii, fig. \b. In 

 these the sides of the thorax ai"e light brown and the al)domen has 

 on each side three or four nearly square brown spots darkest on the 



