COLLECTING AND PRESERVING INSECTS BANKS. 



123 



Fig. 179.— An orb-weaver, Argiope trifasciata: o, 

 Male; 6, female; c and d, enlarged parts. 



mostly in the southern part of the United States. Sometimes they 

 are found in the North in bunches of bananas. 



The daddy-long-legs, harvest-men, or Phalangida (fig. 180) have the 

 two parts of the body broadly joined together, so there is no pedicel. 

 The abdomen shows the seg- 

 ments more or less closely 

 united. The legs are longer 

 than usual in spiders, and 

 there are only two simple 

 eyes situated on a little tu- 

 bercle or eye-eminence on 

 the front part of thecephalo- 

 thorax. They have no spin- 

 nerets. The scorpions, or 

 Scorpionida (fig. 181), have 

 the body elongate, plainly 

 segmented, and behind nar- 

 rowed to form a tail or cauda, which ends in a vesicle with a 

 sting. The abdomen is broadly united to the cephalothorax, and the 

 palpi are long and end in two pairs of claws. There are two or three 

 simple eyes on each side, and a pair in front on the cephalothorax. 

 On the under side of the body, near the hind pair of legs, is a pair of 

 appendages called "combs." The book or false-scorpions (pseudo- 

 scorpions) (Chel- 



onethi) (fig. 182) 



are diminutive 



editions of the 



scorpions but 



without a tail. 



They have only 



one or two eyes 



on each side of 



the head and no 



" combs." 



The mites and 



ticks, or Acarina, 



have no division 



of the body into 



parts or segments, 



or it is only 



faintly indicated. 



The mouth-parts 



are usually close together and form a beak or rostrum. They are 



nearly all of very small size and of very diverse shapes and habits. 



Fig. 180.— A harvest-man, Lio- 

 bunum ventricosum. (from 

 Packard.) 



Fig. 181. — A true scorpion, Cen- 

 trurus carolinianus. (from 

 Packard.) 



