Spiders and Their Near Relatives 



B. Lower margin of the movable finger of the chelicerae 

 with about five teeth. The sting normal. P. 30. 



Uroctonus 



BB. Movable finger of the chelicerae with not more than three 



teeth. Sting of male swollen at base. (Fig. 36). P. 30. 



An UROCTONUS 



AA. Middle area of the comb divided into at least eight small 



pieces. 



B. No tooth on the lower margin of the movable finger of 



the chelicerae. Penultimate tarsal segment of the three 



front pairs of legs not strikingly clothed with bristles 



above. P. 31. Vejovis 



BB. A strong, brown tooth on the lower margin near the tip 

 of the movable finger of the chelicerae. Penultimate 

 tarsal segment of the three front pairs of legs with a 

 comb of long bristles. P. 32. Hadrurus 



Genus UROCTONUS (U-roc-to'nus) 



The lower margin of the movable finger of the chelicerae is armed 

 with about five teeth. The edge of the fingers of the chelae bear one 



long row of tubercles flanked 



by isolated tubercles (Fig. 



35). The sting of both sexes 



is of the usual form. The 



lung-slits are nearly oval. 



Uroctonus mordax. — This is the only known species of this 



genus. It is found on the Pacific Coast. It attains a length of 



nearly two and one half inches. 



Fig. 35 FINGER OF UROCTONUS 



Genus AN UROCTONUS (A-nu-roc-to'nus) 



The movable finger of the chelicerae is furnished with 

 not more than three teeth. The lung-slits are 

 elongate. The sting of the male is swollen at its 

 base (Fig. 36). 



Anurodonus phccodactylus (A. phae-o-dac'ty- 

 lus). — This is the only known species of the genus. 

 It has been found in Utah and in California. It Fig. 36. sting 



.. • , ., £ , , 1 ir • 1 OFANUROC- 



attains a length 01 nearly two and one half inches. tonus 



30 



