NO. II LARVAE OF THE ELATERID BEETLES GLEN I3I 



of segment (exclusive of urogomphi ) . Pleural area large, transversely 

 striate. Sternum of 2 sclerites, separated anteriorly by median suture 

 and posteriorly by tenth abdominal segment ; each sclerite usually 

 with 5 to 8 setae, mostly in row around tenth abdominal segment. 



Urogomphi (ur, fig. 25, h; fig. 25, g) robust, separate, bifid ; directed 

 caudad ; prongs subequal in length but of different shapes. Inner prong 

 (ipr) subtriangular, with strongly sclerotized, undate anteromedial 

 margin ; projecting mediad or caudomediad, sometimes slightly dorsad, 

 terminating in sharp, horny point ; I prominent seta issuing from pos- 

 terior margin, just mediad to base of outer prong. Outer prong (opr) 

 corniform; projecting dorsad or caudodorsad with sharp tip curving 

 upward, sometimes slightly forward; i prominent seta arising from 

 anterior aspect of base of prong. Undivided part of urogomphus 

 with I to 3 setae ventrally and i arising from small tubercle just 

 laterad to base of outer prong. 



Caudal notch (en) small, subovate; longer than wide; narrowed 

 posteriorly, sometimes closed, by converging inner prongs. 



Tenth abdominal segment with about 20 fine setae arranged as 2 

 equal whorls ; anal aperture linear and median. 



Material used in study. — Three examples of the typical cupreus 

 and 18 of the color form aeruginosus were examined. The typical 

 cupreus were received from A. W. Rymer Roberts, of Cambridge 

 University, Cambridge, England, and were used by him in preparing 

 his description (1922) of this species. The aeruginosus larvae were 

 all from Puolanka and Suomussalmi, Finland (Suomi), and were part 

 of the material used by Prof. U. Saalas in his studies (1923a). The 

 specimens examined are deposited in the Canadian national collection 

 and the U. S. National Museum. Listed below is the material of the 

 typical form that was associated with reared adults. Identification 

 of reared specimens was checked by W. J. Brown, of Ottawa. 



2; Windermere, Westend, England; Aug. 5, 1917; i reared to adult, Sept. 2, 

 1918. (C.N.C.) 



LUDIUS PECTINICORNIS (Linnaeus) 



Elater pectinicornis Linnaeus, Systema naturae, ed. 10, vol. i, p. 406, 1758. 

 Ludius pectinicornis (Linnaeus), Eschscholtz, in Thon's Entomologisches Ar- 



chiv, vol. 2, p. 34, 1829. 

 Corymbites pectinicornis (Linnaeus), Latreille, Ann. Soc. Ent. France, vol. 3, 



p. 150, 1834. — ScHENKLiNG, Coleopt. Cat. (ed. Junk), vol. 2, pt. 88, p. 361, 



1927. 



Ludius pectinicornis, a European species, is unique in being the 

 only species of the cupreus group to inhabit Denmark. Schiodte 



