NO. II LARVAE OF THE ELATERID BEETLES — GLEN I3 



used to a considerable extent in the preparation of preliminary 

 sketches of head parts, but none of these sketches were used as final 

 illustrations. 



A millimeter scale indicates the magnification of the drawings of 

 whole larvae, but with few exceptions this is not done for the illus- 

 trations of larval parts. The writer finds himself in close agreement 

 with Blackwelder (1936, p. 7) who states, " . . . . the magnification 

 attained .... is believed to be purely incidental and of no importance 

 to a knowledge of the morphology." 



ABBREVIATIONS USED IN ILLUSTRATIONS 



To clarify the terminology adopted, the list of abbreviations used 

 in the illustrations has been expanded to include the equivalent terms 

 that commonly appear in the literature. In addition, the less familiar 

 terms are defined and the source of the term or of its definition is 

 given in parentheses. 



a: Anal aperture. 



aed: Dorsal anteroepicranial setae (Hj'slop and Boving, 1935, p. 49). 



aev: Ventral anteroepicranial setae (Hyslop and Boving, 1935, p. 49). 



al: Anal lobe. 



ant : Antenna. 



ar: Anal armature (= "scansorial hooks" auct.). 



aim: Medial anterotergal seta. 



br: Brace. 



cd: Cardo. 



en: Caudal notch: the interspace between urogomphi (Comstock 



and Slingerland, 1891). 



co: Condyle. 



cr: Crease. 



cv: Cervical sclerite (= "parietal", Lanchester, 1939, fig. i A, par.). 



ex: Coxa. 



dg: Dorsal groove of mandible. 



distp: Dististipes : "An anterior portion of the maxillary stipes" 



(Boving and Craighead, 1931, p. 81). 



dm: Dorsal margin of inner face of distal part of mandible. 



dpla: Dorsal plate of ninth abdominal segment: the central dorsal 



area; in the biconvex type of elaterid larva, usually flattened, 

 Hmited laterally by raised, carinate margins, anteriorly by 

 transverse impression, posteriorly by caudal notch. 



dplf: Dorsopleural fold (= "dorso-pleural groove" or "dorso-pleural 



line" of Snodgrass, the "ventro-lateral suture" of Boving, 

 and the "pleural suture" of Hopkins) : ". . . . a more or less 

 distinct groove (or infolding) extending along each side of 

 the abdomen below the line of the spiracles . . . ." (Snod- 

 grass, 1931, p. 10, fig. 3, a-a). 



