664 



Pomona College Journal of Entomolooy 



Key to Genera 



a. Joints of prehensorial feet not dentate within ; claws not extending beyond 

 the front margin of head ; last ventral plate verj' wide, 

 b. Edge of labruni 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 labruui at middle with teeth directed caudad; first maxilla with 

 coxa and proximal joint of palpus with long lappets. 



Genus Tabiphilus gen. nov. 



aa. Some joints of prehensorial 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 ceplialic plate and antenna; of Soniphilus secundus 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 tlie 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 piece.s with the lateral supports 

 or laminae fulcientes. D, First and second maxilla; 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. 



