Spiders and Their Near Relatives 

 Genus OPISTHACANTHUS (O-pis-tha-can'thus) 



Only one species of this genus occurs in our fauna. 



Opisthacantbus elatus (O. e-la'tus).- The cephalothorax 

 is deeply emarginate on the anterior margin; the postabdomen 

 is small; the chelae large. Comb with from four to fourteen teeth. 

 The adult is sometimes three and one half inches in length. It 

 is a West Indian species, which is found in southern Florida. 



Family CHACTIDiE (Chac'ti-dae) 



These scorpions can be distinguished from all others found 

 in the United States by the presence of only two lateral eyes on 

 each side. The family is represented in this country by a single 



genus. 



Genus BROTEAS (Bro'te-as) 



In this genus, the last segment of the tarsus bears 

 two rows of bristles on the under side (Fig. 33). Only 

 one species has been found in the United States. 



Broteas alleni (B. al'le-ni).-- This is a small species, 

 the length of the body and tail together of the female 

 being but little more than one inch and of the male, Fig. 33- 

 about one and one half inch. The dorsum is beauti- J^/^ 

 fully polished and not at all tuberculate. The palpi tarsusof 

 are of medium size. The tail is short; in the female, BROTEAS 

 it is not so long as the body. This species is found in 

 southern California. 



Family VEJOVIDiE (Ve-jov'i-dae) 



There is one spur on each side at the 

 base of the last tarsal segment of the last 

 pair of legs. There are three lateral eyes on 

 each side. The sternum is usually broader than 

 long, with a deep median furrow and with the 

 lateral sides nearly parallel (Fig. 34). There is 

 no spine under the sting. There are four genera 

 Fi8 ' 3 ' vSovii 1 M ° F of this family found in the United States: 



A. Middle area of the comb either indistinct or composed 

 of not more than six pieces. 



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