656 Pomona College Journal of Entomology 



aa. Coxosternum witli halves well united at middle; no such pleuro-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 



l)b. First maxilla> with well developed lappets; middle piece of labrum small, 



tlie dentate margin caudad, lateral pieces pectinate, dorsum biculcate. 



Subfamily Geophilinae 



Subfamily Geophilinae 

 The two California genera belonging to this subfamily may be separated 

 thus : 



Key to Genera 

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



Genus Geophilus Leach 

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

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



Genus Arenophilus Chamberlin 



Genus Geophilus Leach 



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

 the front margin of the head 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 

 immediately 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 plate exposed; last ventral plate very wide; coxopleural pores in 

 adults covered by edge of ventral plate, 

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

 margin of head. G. rubens Say. 



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

 beyond front margin of head. G. regnans Chamberlin 



aa. Prebasal plate not exposed ; last ventral plate narrow ; coxopleural pores 

 small, a dozen or more on free surface of coxopleura. 



G. nasintus Chamberlin 



Geophilus rubens Say. 

 Robust; attenuated caudad but not cephalad. Typically there is a geminate 

 and often interrupted black band along the dorsum, though this may be entirely 



