NO. II LARVAE OF THE ELATERID BEETLES GLEN I4I 



transverse row of setae. Anterior part of each mediotergite without 

 prominent setae, but sometimes with a few minute hairs issuing from 

 punctures and from transverse branch of impression. Posterior part 

 of each mediotergite with 6 long setae (only 4 in first segment) 

 arranged as 3 pairs, sometimes with 2 or 3 small unpaired setae 

 distributed between the pairs. One prominent seta and sometimes 

 additional minute hairs laterad to midpoint of longitudinal branch 

 of impression. Laterotergite I extending length of segment ; 3 setae, 

 only I long. Spiracles subequal ; spiracular sclerite ovate, about twice 

 as wide as spiracle and 2 to 3 times as long, situated in anterior half 

 of segment. Pleurite well developed, subovate ; decreasing in size 

 from first to eighth segments, being only about one-half as large 

 in eighth ; with i large and i small seta. Sternum of i sclerite, sub- 

 quadrate; impressions very faint ; usually 8 to 10 unpaired setae near 

 margins. 



Ninth abdominal segment (fig. 26, /), exclusive of uprogomphi, 

 slightly shorter than eighth abdominal segment and at least three- 

 fourths as wide ; four-fifths as long as wide ; sides of anterior half 

 subparallel, posterior half tapering caudally making width at anterior 

 margin of caudal notch about three-fifths greatest width of segment. 

 Dorsum convex, somewhat flattened posteriorly ; sloping downward 

 from front to back. Dorsal plate (dpla) irregularly lined and wrin- 

 kled ; sometimes with a few small, shallow, indefinite pits ; 4 faint 

 longitudinal impressions, 2 laterally (lim) and a paramedian pair 

 (pirn) which converge posteriorly and meet to form a short median 

 groove (mg) almost in center of dorsal plate; without setae (rarely i 

 or 2 very small hairs) except at lateral margins which are slightly 

 raised and carinate, bearing 3 prominent blunt setiferous "teeth" (to) 

 (a fourth "tooth" lies farther posteriorly and more ventrally) ; trans- 

 verse impression (trim) continues across segment. Tergite continues 

 uninterruptedly laterally and on posterior ventral surface, usually with 

 from 10 to 14 setae on each side, but number highly variable, some 

 issuing from small sclerotized tubercles ; anteriorly on lateral aspect 

 about a dozen conspicuous punctures. Distance between posterior 

 margin of pleural area and anterior margin of caudal notch about 

 one-fifth to one-fourth total length of segment (exclusive of uro- 

 gomphi). Pleural area large, transversely striate except for small 

 ovate sclerite at each anterior end. Sternum of 2 sclerites, separated 

 anteriorly by median suture and posteriorly by tenth abdominal seg- 

 ment ; each sclerite usually with from 5 to 8 setae, mostly in row near 

 tenth abdominal segment. 



