344 CLAVICOKNIA— PSELAPIilDAE. 



a. Tarsi five-jointed. 



Antennae placed on forehead ; abdomen with five ventral 

 segments, first four fixed together ; last tarsal joint and 

 claws very strong ; body with thick pubescence, either all 

 over or in parts. Parnidae. 



b. Tarsi four-jointed. 



Antennae placed at sides of head, short, first two joints 

 rather large, third and fourth very small, the rest forming a 

 sawlike club ; ligula prominent ; abdomen with five ventral 

 segments, first four fixed together, anterior coxae cylindrical ; 

 legs adapted for digging, tibiae spined ; body thickly pu- 

 bescent. Heteroceridae. 



PSELAPHITJAE. 



A, Antennae with eleven joints. 



Maxillary palpi strongly developed ; head more or less 

 triangular; eyes prominent and granulated. PsclaiJliides. 



H, Antennae with at most six joints. 



Mouth parts obsolete ; head narrow, longitudinally oval ; 

 eyes and wings wanting. Clavigerides. 



rsELAJPifinjss, 



A, Tarsi with two unequal claws. 



ci. One claw only slightly smaller tlian the other. 



Maxillary palpi as long as head, last joint oval, pointetl ; 

 antennae placed far apart ; penultimate joints not mucli 

 thickened, last joint pear-shaped ; thorax as long as broad, 

 sides tlilated in middle, with tliree depressions before base 

 united Ijy a transverse furrow, and each giving rise to a 

 longitudinal furrow, near margin two other depressions ; 

 elytra with a sutural and short dorsal stria ; abdomen not 

 bordered. Batrisus, Aub. 



h. One claw much smaller tlian the other, almost bristle- 

 like. 



Last joint of maxillary palpi spindle-shaped ; antennae 

 placed far apart, with three larger apical joints, the last 

 very large, oval ; thorax longer than broad, strojigly rounded 

 at sides ; elytra fiat, emarginate near posterior angles ; 

 abdomen bordered. Trichonyx, Chaud. 



