THE CHILOPODA OF CALIFORNIA II 



RALPH V. CHAMBERLIN, PROVO, UTAH. 



FAMILY LITHOBIIDAE (continued) 



Genus Pseudolithobius Stuxberg 

 Only the type species of this wtnus is known. 



Pseudolithobius megaloporus Stuxberg 



Antennae very short, consisting of nineteen to twenty articles, of which the 

 ultimate is very long. Ocelli seven in two series (1-3, 3). Prosternal teeth 

 2-2 or 3-3. Angles of the ninth, eleventh and thirteenth dorsal plates produced. 

 Coxal pores 2, 2, 1, 1, 1, very large, circular. Anal legs very short, crassate, 

 spines 0, 1, 1, 0, the claw unarmed. 



Length of body 12 mm.; of antenna i mm.; of anal legs 2.5 mm. 



Known only from the type collected near San Francisco by Eisen. 



Thus far I have not identified this species in an abundance of material from 

 California. Judging from the description of antennae, spining of legs, coxal 

 pores, etc., it would seem practically certain that this species was based upon an 

 immature specimen. 



Order Epimorpha 

 The members of this order fall in two main groups or suborders which may be 

 separated as follows : 



Key to suborders of the Epimorpha 



A. With twenty-one or twenty-three pairs of legs ; pairs of spiracles nine, 



ten, eleven, or nineteen. Scolopendroidea. 



AA. Pairs of legs thirty-one or more; pairs of spiracles two less than the 



number of pairs of legs, being absent from the first and the last body 



segment. Geophiloidea. 



Suborder Scolopendroidea 



The members of the Scolopendroidea live for the most part in the warmer 

 regions of the earth, the large tropical and sub-tro))ical centipedes belonging 

 here. 



The members of the group are essentially nocturnal, during the daytime 

 lying concealed in holes in the ground, under stones, bark, logs, fallen leaves, 

 etc., and at night wandering about and often entering dwelling houses. They 

 live chiefly upon insects, spiders, worms, and smaller ehilopods. 



The body is elongated and varies from slender to robust. The antennae are 

 short and arc composed of from seventeen to thirty-three articles, the number 

 varying mostly toward the lesser limit. Eyes either absent or composed of four 

 simple ocelli on each side. Prehensorial feet with coxae completely fused in a 

 presternum which mesally extends eeplialad in two processes which may or may 

 not bear teeth. The basal plate, or dorsal scutum of segment to which prehen- 

 sorial feet belong, either absent or rudimentary. Pairs of legs constant (either 



