PHALANGIIDA 



411 



of the male somewhat smaller and with longer legs than the female; 

 a pair of simple eyes present, one being on each side of a tubercle rising 

 in the middle of the cephalothorax; genital opening between the last 

 pair of legs in a forward prolongation of the ventral plate of the first 

 abdominal segment from which also extends a long protrusible penis or 

 ovipositor (Fig. 648,2); a pair of stink glands on the abdomen, which 

 often become active when the animal is handled ; respiration by trachdae, 

 usually a single pair of spiracles being present on the first abdominal 

 segment ; eggs laid in the ground or in other moist places in the summer 

 or autumn and the young, which are like the adults in appearance, usu- 

 ally hatch the following spring: 

 about 60 species in America, 

 grouped in 7 families ; animals more 

 or less nocturnal, probably feeding 

 principally on small insects, spiders, 

 and mites, but also occasionally on 

 decaying substances; they do not 

 spin a web or build a nest. 



Key to the families of Phalan- 

 giida here described: 



«! Last segment of pedipalp with 

 a terminal claw and longer 

 than the preceding one. 



1. Phalangiidae 



O2 No such claw and the last seg- 

 ment much shorter than the 

 preceding one . 2. Nemastomatidae 



■i, 3; 



Fig. 647 — A, dorsal view of a pha- 

 langid ; B, ventral view of a phalangid 

 (Banks). 1, mandibles; 2, pedipalps ; 

 8, legs; 4, eye tubercle; 5, abdomen; 0, ' 

 cephalothorax ; 7, genital pore ; 8, for- 

 ward prolongation of abdomen; 9, 

 spiracle ; 10, anus. 



Family 1. PHALANGIIDAE. (Fig. 647.) 



Body ovoid w^ith a leathery integument; pedipalp ending with a 



claw; legs long and slender, with a simple terminal 



1 claw on each: about 15 American genera. 



Key to the genera of Phalangiidae here de- 



"''•J'^^nK scribed : 



«! Eye tubercle of enormous size 1. Caddo 



flo Eye tubercle of normal size 2. Liobunum 



61 Eye tubercle smooth. 

 J 62 Eye tubercle spinose 3. Phalangium 



Fig. MS— Caddo agilis 1. Caddo Banks. Eye tubercle of enormous 



(Corastock). 1, eye; . . i? -i- i 



2, ovipositor. Size; 3 long spmes on lemur 01 pedipalp: one 



species. 



C. agilis Banks (Fig. 648). Body 3 mm. long, brown in color, with 



2 pale stripes above: among dead leaves and moss. 



