THE SPIDER AND ITS ALLIES 



93 



palp. 



segmented and intimately joined with the cephalothorax. 1 

 Here belong the true scorpions, in which the posterior six 

 segments of the abdomen are much smaller in diameter 

 than the seven anterior segments, and form a sort of tail 

 (post-abdomen ) . Nearly 

 twenty species of scor- 

 pions occur in the 

 warmer parts of North 

 America. Centrums in- 

 famatus ranges from the 



* O 



southern Atlantic States, 

 through Texas, and 

 north into southern Kan- 

 sas. The tip of the tail 

 bears a sting, which con- 

 nects with a poison-sac. 

 The largest scorpions 

 of the tropical countries 

 are the most dangerous, 

 but the wounds even of 

 these are rarely fatal. 



The Phalangina, 2 the 

 extremely common 

 "Daddy-long-legs," or 

 harvest-men, in which 



the legs are very long, FlG oi.__Buthus, a European scorpion. 



and the abdomen short Dorsal view. MX., maxillary; Cephth., 



, . . , rp . cephalothorax; Troch., trochanter ; Tor.s'., 



and tlllCK. hey OCCUr tarsus; AbO., abdomen ; Bla., poison blad- 



aboilt houses, in woods, d er; St., sting. From Kraepelin in "Das 



Tierreich.' 



and in fields. They 



feed on small insects and are highly beneficial animals to 



2 0aAd77ioj>, a spider, especially a poisonous species. 



Dorsal ridge*--- 

 Lateral ridge-' 



1 Fig. 91. 



