NO. II LARVAE OF THE ELATERID BEETLES GLEN 85 



amined was 17 mm. long and 3.0 mm. wide. Body robust, with large 

 membranes on lateral aspect of thorax and abdomen; all segments 

 broader than long; head and ninth abdominal segment about two- 

 thirds greatest body width. Dorsum dark brown, each segment paler 

 posteriorly, giving larva a superficial appearance of transverse bands 

 of auburn shade (Ridgway, 191 2) on paler background. Venter 

 pale yellow, darker on under side of head and terminal part of ninth 

 abdominal segment. Dorsum slightly rugose ; minutely punctate, punc- 

 tures usually more abundant on anterior half of segments. 



Head (fig. 19, a) subquadrangular with slightly arcuate sides; 

 flattened above and below. 



Frontoclypeal region (fig. 19, b) with posterior part extending 

 backward almost to foramen magnum, but terminating definitely be- 

 fore reaching foramen; bluntly pointed posteriorly. Four to six 

 prominent anterior nasosulcal setae (nsa) on each side of base of 

 nasale. Nasale («) well developed; tip tridentate, median denticle 

 sharp (when uneroded) and longer than lateral denticles which are 

 truncate anteriorly. Subnasale consisting of almost straight trans- 

 verse ridge, finely serrate when uneroded. Paranasal lobes slightly 

 produced beyond nasale, each bearing 4 setae (i small). 



Epicranial plates sparsely and finely punctulate. Dorsal sulci prac- 

 tically lacking, but with 4 setae in sulcal area; the most anterior seta 

 very long, others small. Ventral sulci bearing row of about 7 setae, 

 usually about 2 to 4 conspicuous. On each gena, usually 2 pairs of 

 lateroepicranial setae {lev, led) with i unpaired seta nearer dorsal 

 sulcus and i nearer setae surrounding eye. Eye spot (e) black, well 

 defined, ovate or circular ; surrounded by 4 unpaired setae. Postgenal 

 areas expanded mesally, almost meeting anteriorly; glabrous. 



Gula (gu, fig. 19, /) elongate, narrowed anteriorly; glabrous. 



Antenna {ant, fig. 19, a; fig. 19, d) with first segment clavate, 

 two-thirds 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 small setae or pegs borne distally ; 

 usually 5 (varying from 3 to 6) conical "sensory" appendices (j-a/?) 

 just ventrad to base of third segment. Terminal segment small, more 

 than half as long as second segment but only one-quarter as wide; 

 4 or 5 setae on apex. 



Mandibles of moderate length, robust ; two-thirds to three-fourths 

 as wide at base as long ; retinaculum well developed ; penicillus some- 

 times reaching base of retinaculum. Distal half inward bending, 

 pointed; outer surface convex with very short dorsal groove; inner 



