NO. II LARVAE OF THE ELATERID BEETLES GLEN 6l 



3 spinelike setae on posterior surface. Ungula, when uneroded, al- 

 most as long as tibiotarsus. 



First to eighth abdominal segments subequal ; first segment shortest ; 

 first and second segments sometimes widest, but usually very little 

 difference in width. Mediotergites with a few small, shallow, indis- 

 tinct pits; transverse branches of impressions very short and in- 

 distinct, curving slightly backward ; longitudinal branch of impression 

 only a faint groove extending approximately one-half distance from 

 transverse branch to posterior transverse row of setae. Anterior part 

 of each mediotergite with transverse row usually of 4 unpaired setae 

 arranged as follows : most lateral seta largest, situated below im- 

 pression ; I at end of transverse branch of impression ; i halfway be- 

 tween transverse branch and median dorsal suture; i tiny seta near 

 dorsal suture; sometimes a few additional minute setae. Posterior 

 part of mediotergite with transverse row of about 10 setae (fewer 

 in first segment), 6 most conspicuous setae arranged as 3 pairs (i 

 short and i long seta in each pair), i small seta between pairs, i or 2 

 minute setae farther mediad than most medial pair, sometimes i 

 minute seta laterad to most lateral pair. Lateral part of mediotergite 

 with I or 2 small setae short distance caudad to most lateral seta in 

 anterior row. Laterotergite I extending length of segment ; bearing 4 

 to 6 setae, only i conspicuous. Spiracles subequal ; borne in posterior 

 part of small, ovate spiracular sclerite which is approximately twice 

 length of spiracle and situated in anterior half of segment. Pleurite 

 large, subtriangular ; bearing 3 or 4 setae (only i long) on posterior 

 half; definitely largest in first segment and smallest in eighth. 

 Sternum of i piece, subquadrate, narrower posteriorly ; usually bear- 

 ing from 10 to 16 setae, mostly near lateral margins. 



Ninth abdominal segment (fig. 16, /) exclusive of urogomphi, 

 slightly shorter than eighth abdominal segment and almost as wide; 

 three-fourths to four-fifths as long as wide ; sides subparallel. Dorsum 

 strongly convex ; with minute, sparse punctures ; 4 faint longitudinal 

 impressions, 2 laterally and a paramedian subparallel pair; central 

 area with 4 conspicuous setae (2 most posterior longer) and usually 

 2 to 6 small setae; lateral margins not well defined, almost lacking 

 anteriorly, bearing i or 2 small, blunt, setiferous tubercles ("teeth") 

 posteriorly and i or 2 unpaired setae farther forward; transverse 

 impression short and very faint, almost wanting. Tergite continues 

 uninterruptedly laterally and on posterior ventral surface; usually 

 with from 20 to 30 setae on each side, nearly all in posterior half of 

 segment. Distance between posterior margin of pleural area and an- 

 terior margin of caudal notch approximates one-sixth to one-tenth 



