TENEBKIONIDAE. 361 



Tribe I.— CRAXIOTIIVI. 



Body oblong:, convex, apterous ; front trilobed, labrum promi- 

 nent, covering the mandibles; mentum large, entirely closing the 

 gular cavity; thorax narrower than the elytra, without trace of 

 lateral margin ; elytra oval, embracing rather widely the abdo- 

 men, connate, epipleurae not distinct; anterior coxa) rather widely 

 separated, the prostcrniuii concave between them and not reach- 

 ing the mesosternuni; posterior coxa3 oval, distant. Tarsi spinu- 

 lose beneath. The antennae are apparently ten-jointed, the ter- 

 minal joint being small and scarcely distinct from the tenth. 



This tribe contains but one species, Craniotus pubescens Lee, 

 found in the desert regions of California and Arizona. The sexes 

 differ in the form of the terminal joint of the maxillary palpi, 

 which is very broadly triangular iii the male, and narrow in the 

 female. 



Tribe II.— EPIPH¥SI]VI. 



Body short, convex, apterous; front trilobed, labrum prominent; 

 mentum very large, entirely filling the gular cavity; ligula and 

 maxillas concealed ; thorax very short, anterior angles acute, 

 prominent ; elytra globose, sides embracing widely the flanks, 

 cpipleuras narrow; anterior coxae widely separated, prosternum 

 closely fitting to the mesosternuni ; hind coxas transverse, widely 

 separated. Tarsi ciliate beneath. Antennae eleven-jointed. 



This tribe contains but two genera, each characterizing a sepa- 

 rate group. Epiphysa, with short tarsi and glabrous body, is 

 found at the Cape of Good Hope. Edrotes, with slender tarsi 

 and sparsely clothed with long hairs, contains two species : one 

 (E. rotundus) found on the eastern slope of the Rocky Moun- 

 tains ; the other {E. ventricosus Lee.) in the Colorado Valley, 

 California. 



Tribe III.— Gi\ATnOSII]VI. 



Body variable in form, apterous ; front trilobed in our genera, 

 but with at least a prominent middle lobe, always leaving the 

 base of the mandibles exposed; labrum prominent; mentum very 

 large, entirely filling the gular cavity; ligula and maxillae con- 

 cealed ; elytra widely embracing the flanks of the abdomen, or not; 

 prosternum not adapted to the niesosternum. Tarsi (except in 

 Triphalus) with rigid hairs beneath. 



