NO. II LARVAE OF THE ELATERID BEETLES GLEN 33 



KEY TO SUBFAMILIES OF THE KLATERIDAE AND TO TRIBES OF 

 THE SUBFAMILY PYROPHORINAE 



1. Ninth abdominal segment with a median caudal notch (cii, fig. 8 c, d) , 



sometimes small ■■ 2 



Ninth abdominal segment without a median emargination (fig. 8, a, b) . . 3 



2. Ninth abdominal segment bearing 2 large dorsal prongs anterad to 



the urogomphi (dpr, fig. 8. c) [ nasale minute or wanting; man- 

 dibles with retinaculum ; tenth abdominal segment without "arma- 

 ture" Subfamily OESTODINAE 



Ninth abdominal segment without prongs anterad to urogomphi (figs. 

 8, d; 9, /; 10, /; 11, (/); nasale well developed (n, fig. 9, 

 a, j) Subfamily PYROPHORINAE 4 



3. Abdomen with pseudosegmentation (fig. 8, a) ; mandibles deeply cleft 



into dorsal and ventral branches ; spiracles placed upon retractile 

 papillae ; tenth abdominal segment bearing accessory anal lobes 



(al) Subfamily CARDIOPHORINAE 



Abdomen without pseudosegmentation (fig. 8, 6) ; mandibles with retinac- 

 ulum ; nasale well developed Subfamily ELATERINAE 



4. Postmentum triangular (pint, fig. g, c) 5 



Postmentum subrectangular (pmf, fig. 9, /;) . .Tribe LEPTUROIDINI (p. 33) 



5. Mandibles without teeth on inner aspect (fig. 9, d, e) ; tenth ab- 



dominal segment usually with "anal armature" (ar, fig. 9, 



i) Tribe PYROPHORINI 



Mandibles with 3 teeth on inner aspect Tribe PITYOBINI 



LARVAL CHARACTERISTICS OF THE TRIBE LEPTUROIDINI 



On the basis of larval characters, the tribe Lepturoidini includes the 

 species separated by Leng (1920) into the tribes Lepturoidini, 

 Hypnoidini, and JNIelanactini. 



Hyslop (1917) characterized the tribe as follows: Postmentum 

 broad caudad, mandibles with teeth on inner surface, and tenth 

 abdominal segment without armature. There is no doubt that these 

 are the primary diagnostic characters of this group. However, a more 

 nearly complete characterization of a lepturoidine larva would be: 

 Ninth abdominal segment emarginate posteriorly (en, figs. 8, d ; 10, 

 a, f; II, a) and without dorsal prongs anterad to urogomphi; tenth 

 abdominal segment without armature ; the bases of stipites distinctly 

 separated and postmentum subrectangular {pmt, fig. g, h) ; mandibles 

 with I or more teeth on inner surface (figs. 2, e; 9, /, g) ; nasale 

 well developed (n, figs. 9, ;; 19, b) ; gula present (gu, figs, i, b; 19, 

 /; 27, b ) , sometimes very narrow ; and cardines moderately large 

 (cd, figs. 9, h; 22, b). 



3 In larvae of the genus Hcmirhipiis (q.v. Boving and Craighead, 1931, pi. 

 84 G) the urogomphi are fused except at the tips, resulting in a small but distinct 

 notch. In some first-instar larvae this notch may be closed (op. cit. pi. 85 O), 

 but the line of fusion of the urogomphi is evident. 



