Spider and Their Near Relatives 



CC. The above-mentioned spine preceded by a short tu- 

 bercle (Fig. 20). T. marginemaculata 



Of these species Tarantula palmata alone has not been found 

 in the United States. 1 found T. marginemaculaia (Fig. 18) 

 not uncommon near Miama, Fla., under logs. 

 It is a very active creature. 



According to several observers, the eggs 

 of members of this genus are carried in a sac 

 formed of a dark brown transparent material, 

 Flg ' I9 containing some threads, and attached to the 

 ventral surface of the abdomen (Laurie '94). It is supposed 

 that the substance of which the egg-sac is composed exudes from 

 openings in the first abdominal segment (Bernard '95); but our 

 knowledge of the spinning glands of these animals is very in- 

 complete. 



Order SCORPIONIDA 



The Scorpions 



The order Scorpionida (Scor-pi-on'i-da) includes only the 

 scorpions. Although these creatures do not live in the North, 

 they have been pictured so often that their 

 form is well-known. Their most striking 

 features are the large size of the pedipalps 

 which are furnished with very stout chelae, 

 and the division of the abdomen into two 

 portions: a broad preabdomen, consisting 

 of seven segments; and a slenderer tail-like 

 division, the post-abdomen or cauda, con- 

 sisting of five segments. At the end of the 

 postabdomen there is a large poison-sting, 

 which appears like a segment (Fig. 21). 



The cephalothorax is compact and 

 unsegmented; the abdomen is broadly 

 joined to the thorax; the chelicerae are 

 chelate; the coxae of the pedipalps are fitted 

 for crushing the prey, which is seized by 

 the large chelae; the remaining four pairs of 

 cephalothoracic appendages are fitted for 



.: 1 



Fig. 21. A SCORPION 



