664 



Pomona College Journal of Entomology 



Key to Genera 



a. Joints of prchciisorial I'ect not dentate within; claws not extending beyond 

 the front margin of head ; last ventral plate very wide, 

 b. Edge of labrum bent centrad at middle, its teeth extending in same direc- 

 tion ; coxa of first maxilla without lappet, the proximal article of 

 palpus with a conical process or lappet which is shorter than the distal 

 article. Genus Soniphilus Chamberlin 



bb. Edge of labrum at middle with teeth directed caudad; first maxilla with 

 coxa and proximal joint of jialpus with long lappets. 



Genus Tabiphilus gen. nov. 



aa. Some joints of preheusorial feet dentate within; claws when closed extending 



beyond front margin of head; last ventral plate but moderate in width. 



Genus Poaphilus Chamberlin 



Figure 218 

 A, Dorsal view of cephalic plate and aiitcnii,-e of Soniphilus scciindiis sp. nov. 

 B, Cephalo-ventral view of labrum of the same, showing the two large middle teeth 

 and the outlines of the lateral pieces over which the median extends. C, Labrum of 

 Linotenia la'vipes (Wood), showing the large median piece which is dentate along 

 the edge directed anteriorly, and the smooth lateral pieces with the lateral supports 

 or lamina; fulcicntes. D, First and second maxillx of Gnathomerium melanonotum 

 (Wood), showing the divisions of the first with the membranous lappets on each 

 side, and, in the second, the conspicuous pleura-sternal sutures. E, Labrum of the 

 same, showing how the lateral pieces extend over the median and meet at the 

 median-line. 



