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 tracheae, 

 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 ; animate 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: 



0! Last segment of pedipalp with 

 a terminal claw and longer 

 than the preceding one. 



1. PHALANGIIDAE 



a 2 No such claw and the last seg- 

 ment much shorter than the 

 preceding one . 2. NEMASTOMATIDAE 



Fig. 647 A, dorsal view of a pha- 

 langid ; B, ventral view of a phalangid 

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

 3, logs ; 4, eye tubercle ; 5, abdomen ; t>, 

 cephalothorax ; 7, genital pore ; 8, for- 

 ward prolongation of abdomen; 9, 

 spiracle ; 10, anus. 



FAMILY 1. PHALANGIIDAE. (FiG. 647.) 



Body ovoid with 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- 

 scribed : 



tti Eye tubercle of enormous size 1. CADDO 



a 2 Eye tubercle of normal size .2. LIOBUNUM 



&! Eye tubercle smooth. 



6 2 Eye tubercle spinose 3. PHALANGIUM 



Fig. 648 Caddo agilis 



(Comstock). 1, eye; 



2, ovipositor. 



1. CADDO Banks. Eye tubercle of enormous 

 size; 3 long spines on femur of 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. 



