656 Pomona College Journal of Entomology 



aa. Coxosternum witli lialves well united at middle; no such plcuro-sternal 

 suture present, 

 b. First maxillae without lappets ; middle piece of labrum very large, over- 

 lapping the ends of the short lateral pieces, which are unarmed, 

 dentate along its anterior edge; dorsum not bisulcate. 



Subfamily Linoteniinae 



bl). First maxillse witli well developed lappets; middle piece of labrum small, 



the dentate margin eaudad, lateral pieces pectinate, dorsum biculcate. 



Subfamilj- Geophiliiinr 



Subfamily Geophilinae 

 The two California genera belonging to tliis subfamily may be sc])arated 

 thus : 



Key to Genera 

 a. Joints of jirehensorial feet not dentate within ; anal legs ending in claws. 



Genus Geophilus Leach 

 aa. Joints of prehensorial feet dentate within ; anal legs not terminating in 

 claws, the claw being replaced by a small seventh article. 



Genus ArenophUus Cliamberlin 



Genus Geophilus Leach 



In this genus the preliensorial feet, for tlie most part, do not extend beyond 

 the front margin of the liead and are unarmed within or with but rudiments of 

 denticles at base of claw. The basal plate is wide. In most species the last 

 ventral plate is wide but in some it is but moderate or even narrow. The anal 

 legs end in claws. The middle piece of the labrum is usually dentate and the 

 lateral ones pectinate. In the species here included as belonging to the Cali- 

 fornian fauna the ventral pores are numerous and arranged in a transverse band 

 inunediately in front of the caudal margins of sternites. 



The three known Californian species may be separated by means of the 

 following key. 



Key to Species 

 a. Prebasal i)late cxi)osed ; last ventral plate very wide; coxojileural jiores in 

 adults covered by edge of ventral plate, 

 b. All spiracles circular ; claws of prehensorial feet extending beyond front 

 margin of head. G. rubens Say. 



bb. Anterior spiracles elliptical; claws of jjrehensorial feet not extending 

 beyond front margin of head. G. regnans Cliamberlin 



aa. Prebasal Jjlate not exposed; last ventral ))late narrow; coxo])leural pores 

 small, a dozen or nion' on free surface of coxopleura. 



G. naxintii.i Cliamberlin 



Geophilus rubens Say. 

 Robust ; .•itteiiuated eaudad but not cephalad. Typically there is a geminate 

 and often int(Tru|)ted black band along the dorsum, though tliis may be entirely 



