NO. II LARVAE OF THE ELATERID BEETLES— GLEN 1 23 



half tapering caudally making width at anterior margin of caudal 

 notch about two-thirds to three-fourths greatest width of segment. 

 Dorsum convex anteriorly, flatter posteriorly. Dorsal plate (dpla) 

 irregularly wrinkled, sometimes with sparse, small, shallow pits some 

 of which usually bear minute setae ; 4 indistinct longitudinal impres- 

 sions, 2 laterally and a paramedian pair ; sometimes a short transverse 

 depression in caudal half of segment ; central area with 4 prominent 

 unpaired setae ; lateral margins not well defined, bearing 2 prominent, 

 blunt, setiferous tubercles or "teeth" (to), the more posterior "tooth" 

 being also more ventral; transverse impression (trim) continues 

 across segment, almost reaching to pleuron ; sometimes few small, 

 stout setae issue from impression and from area in front of impres- 

 sion. Tergite (tg) continues uninterruptedly laterally and on poste- 

 rior ventral surface ; usually with about 10 setae on each side. Dis- 

 tance between posterior margin of pleural area and anterior margin 

 of caudal notch approximates one-fourth to one-third total length 

 of segment (exclusive of urogomphi). Pleural area (pi) large, trans- 

 versely striated, sometimes with i tiny seta on each side near anterior 

 end. Sternum (st) of i sclerite, tenth abdominal segment (10) emerg- 

 ing from posterior part ; bearing many minute setae scattered over 

 sclerite and 6 to 10 larger setae, mostly near margin bordering tenth 

 segment. 



Urogomphi {iti% fig. 24, c, d) long, diverging, bifid; outer prong 

 many times larger than inner prong. Inner prong {ipr) very small, 

 corniform ; appearing as a sharp, horny "tooth" on inner aspect of 

 base of outer prong ; projecting caudomediad, at right angle to outer 

 prong ; tip usually curving upward ; with 2, sometimes 3, prominent 

 setae at base of prong or at junction with outer prong. Outer prong 

 {opr) very large, corniform; projecting latero-caudodorsad, curving 

 upward and forward, terminating in sharp, horny point; bearing i 

 or 2 prominent setae laterally near base of prong; sometimes a few 

 small or minute setae scattered over proximal part of prong. Un- 

 divided part of urogomphus at least three-fourths as long as outer 

 prong ; bearing i prominent seta ventrally a short distance from junc- 

 tion of prongs ; sometimes i short seta laterally just anterad to base 

 of outer prong. 



Caudal notch {en) large, V-shaped; narrowed posteriorly by inner 

 prongs. 



Tenth abdominal segment (/o) with a whorl of 10 fine setae; anal 

 aperture linear and median. 



