WHIP-SCORPIONS. 



123 



From the last joint arises a long, jointed, caudal appendage, much like a whip-lash 

 in appearance. The species are found 

 in both hemispheres, but in the eastern 

 hemisphere it is said by Stoliczka that 

 none are found west of India and Cey- 

 lon, not even in East Africa. But one 

 form, T. giganteus, has been found in 

 the United States. 



The species of both of these genera 

 are very difficult to identify, and much 

 difference of opinion exists concerning 

 them. Like many of the arachnids 

 they are furnished with a poison ap- 

 paratus which here, as in the true 

 spiders, is placed in the cheliceras. 

 Of the development of the Pedipalpi 

 nothing is known. 



FIG. 178. Phnjnus lunatus. 



SUB-OKDER III. - - S 



These forms are readily separated from all other arachnids by the segmented 

 cephalothorax. The body is long; the chelicerae are chelate, and the palpi resembles 



FIG. 179. Thelyphonus caudatus, whip-scorpion. 



the true legs. Specimens are far from common in the United States, but thanks to 

 the late J. Duncan Putnam our native forms are very well known. 



There are fifteen genera, two of which (Datames and Cleobis) are represented in 

 the United States by nine species. These forms, which are found in the warmer parts 



