NO. II LARVAE OF THE ELATERID BEETLES GLEN II3 



Frontoclypeal region (fig. 23, a) with posterior part extending 

 backward to or almost to foramen magnum {for) ; broadly rounded 

 (almost truncate) posteriorly. Nasale and adjoining parts of frons 

 only slightly sunken. Nasale (w) well developed; tridentate at tip; 

 median denticle largest ; lateral denticles appear as lateral expansions 

 of median tooth ; i robust seta arising from dorsal aspect of base of 

 each lateral denticle. Subnasale with sclerotized transverse ridge, 

 possibly serrate when uneroded, but no serration in material at hand, 

 all of which has been badly eroded. Paranasal lobes produced beyond 

 nasale. 



Epicranial plates bearing small shallow pits. Two conspicuous 

 dorsal posteroepicranial setae {ped, fig. 2t„ a), one on each side of 

 frontal sutures near posterior limit of frons. Dorsal sulci with 5 setae 

 subequally spaced, the most anterior seta very long, the next of mod- 

 erate length and farthest laterad, others very small. Ventral sulci 

 bearing row of 7 to 9 setae, usually 4 or 5 conspicuous. Two pairs 

 lateroepicranial setae with i small or minute seta caudad to more 

 ventral pair and sometimes a few minute setae scattered over lateral 

 aspect of genae. Eye spot black; well defined, ovate or circular; sur- 

 rounded by 4 or 5 setae ; usually i additional seta short distance caudad 

 to most dorsal of setae surrounding eye. Postgenal areas expanded 

 mesally, sometimes almost meeting ; i minute seta in area near ventral 

 head ridge. 



Gula of moderate length and width ; glabrous. 



Antenna with first joint clavate, two-thirds to three-fourths as 

 wide as long; without setae; 3 or 4 small pores. Second segment 

 subcylindrical, almost as wide as long; three-fifths length of basal 

 joint; I or 2 pores; a few minute setae borne distally; i medium- 

 sized conical "sensory" appendix just ventrad to base of third seg- 

 ment. Terminal joint small, at least one-half length of second joint 

 and about one-third as wide ; 4 setae on apex. 



Mandible of moderate length, robust, about two-thirds as wide 

 at base as long; retinaculum well developed; penicillus sometimes 

 reaching base of retinaculum. Distal half inward bending, pointed ; 

 outer surface convex with deep dorsal groove; inner face slightly 

 excavate with small median carina; ventral margin of inner face 

 sharp, straight or very slightly convex ventrally; dorsal margin of 

 inner face sharp, strongly convex dorsally. 



Ventral mouthparts three-fourths as wide across bases of stipites 

 as across anterior ends of stipites. Cardines slightly separated. Stipes 

 large, subrectangular ; proxistipes and dististipes not distinct ; usually 5 



