TRACHEATA 



405 



Appendages of Pedipalpi. 



1. Chelioerae. 4. 2iid pair of legs. 



2. Pedipalpi. 5. Srd ,, ,, 



3. 1st pair of legs, antenniform. 6. 4th „ „ 



The chelicerae are clawed, and probably contain poison 

 glands ; the pedipalpi are clawed in Phrynus, and chelate 

 in ThelypJioniis. The elongated anterior legs function as 

 antennae, which they resemble in structure. The other legs 

 are seven-jointed. A pair of closed coxal glands lying be- 

 tween the second and fourth pairs of legs have recently been 

 described. 



The genital orifice is ventral, at the anterior end of the 

 abdomen, and the respiratory sacs open, one pair on the 



Fig. 232. — Thelyphonus, portion of under side. 



a. Moveable claw on pedipalp. 

 h. Fixed claw on pedipalp. 



c. Claw on third palpal joint. 



d. Coxal joint of pedipalp, 

 e, f. Sternal plates. 



g. Orifice of sexual organs. 



h. Place of lahium. 



0. Orifices of respiratory organs. 



posterior edge of both the second and the third abdominal 

 segments. Phrynus, like the scorpions, produces its young 

 alive. There are eight eyes : two large ones near the centre 

 of the cephalothorax, and six small ones round its 

 margin. 



Thelyphonus seems to be nocturnal in its habits, and passes 

 the day under pieces of bark, etc. When irritated, it is said 

 to carry its tail erect like the scorpions, and the chief interest 

 of the group lies in their forming an intermediate link 

 between the Scorpionida and the Araneida. 



