THE THOAIISID/E 



39 



,.///, 



.#/ 



mm 



114 



radiating white lines. The abdomen is light in front and 

 marked behind with two or three pairs of indistinct transverse 

 lines (fig. 112). On the under side 

 the whole body and legs are pale, 

 without spots except a wide middle 

 band of gray under the abdomen. 

 The third and fourth legs are shorter 

 than the first and second, the differ- 

 ence being greater than in Philodro- 

 mus and less than in Misumena. 



Tibellus duttonii. — This is a very common spider 

 on bushes and grass. The body is slender, from 

 a third to half an inch long, and a tenth of an 

 inch wide (fig. 115). The thorax is an eighth of 

 an inch long, widest across the hinder half and 

 narrowed toward the front, where it is cut off 

 nearly straight over the mandibles. Both rows 

 of eyes are strongly curved (fig. 116). The 

 hinder row is twice as long as the front row and 

 all the eyes larger. The abdomen is straight at 

 the sides and a little pointed behind. The color 

 is light gray or yellow, with a darker gray line 

 in the middle, divided into two 

 toward the eyes. At the sides of 

 the thorax are other longitudinal 

 lines. On the abdomen, one-third 

 its length from the hinder end, is 

 a pair of small round or oval black 

 spots. The legs are light gray, with 

 no markings except a few black 

 hairs. 



Thanatus coloradensis or lycosoides. — In color and general 

 appearance this resembles Philodromus, but is not as flat, and 



Figs. 114, 115, 116. Tibellus 

 duttonii. — 115, female en- 

 larged four times. 1 14, one 

 of the feet. 116, front of 

 head, showing eyes and man- 

 dibles. 



