NO. II LARVAE OF THE ELATERID BEETLES GLEN I27 



be characterized as follows : Up to 25 mm. in length ; mediotergites of 

 abdominal segments (fig. 25, d) moderately punctate anteriorly; each 

 mediotergite of seventh and eighth abdominal segments (fig. 25, d) 

 with posterior transverse row of 7 or more setae ; 5 conspicuous setae 

 on antero-lateroventral aspect of stipes. 



Description of "mature" larva (form aeruginosus) . — Length 21 

 mm. ; greatest breadth 3.0 mm. on fourth abdominal segment. Largest 

 larvae examined measured up to 3.25 mm. in width; Saalas (1923a, 

 p. 125) and Beling (1883, p. 270) report specimens attaining 25 mm. 

 in length. Body robust, with small membranous areas laterally ; all 

 segments broader than long ; head and ninth abdominal segment about 

 two-thirds greatest body width. Dorsum yellowish brown to dark 

 brown, probably near "amber brown" (Ridgway, 1912) or paler in 

 living specimens, but usually much darker in preserved specimens 

 examined ; head and prothorax usually slightly darker ; Saalas (1923a, 

 p. 126) and Beling (1883, p. 271) state that the ninth abdominal 

 segment is of lighter color; venter somewhat paler than dorsum. 

 Dorsum slightly rugose ; segments punctate anteriorly, punctation 

 varying from few small punctures to many moderate-sized punctures. 



Head subquadrangular with arcuate sides ; flattened above and 

 below, 



Frontoclypeal region with posterior part extending backward to 

 foramen magnum ; truncate posteriorly. Two prominent anterior naso- 

 sulcal setae on each side of base of nasale. Nasale (n, fig. 25, a) uni- 

 dentate, terminating sharply when uneroded. Subnasale (sn) con- 

 sisting of transverse ridge, anteriorly convex, finely serrate when 

 uneroded, with from 14 to 17 subequal, short, sharp, forward-project- 

 ing denticles. Paranasal lobes produced beyond nasale, each bearing 

 3 setae (i small), sometimes additional minute setae. 



Epicranial plates sparsely and finely punctulate. Dorsal sulci shal- 

 low, each with 5 setae subequally spaced, the most anterior seta very 

 long, the next moderately long, others small. Ventral sulci bearing 

 row of 6 to 9 setae, usually 2 to 5 conspicuous. Two large unpaired 

 lateroepicranial setae. Eye spot black, ovate or circular; bordered by 

 2 conspicuous setae and sometimes a third minute hair. Postgenal 

 areas expanded mesally, almost meeting ; glabrous. 



Gula short, narrowed posteriorly ; goblet-shaped ; glabrous. 



Antenna with first segment weakly clavate ; two-thirds to three- 

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

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

 segment ; i or 2 pores ; a few minute setae or pegs distally ; i medium- 



