NO. II LARVAE OF THE ELATERID BEETLES GLEN 9I 



20 unpaired setae, and 5 to 9 setae near lateral margin. Laterotergite I 

 bearing 4 to 7 setae. Pleurite with 3 to 5 setae. 



Coxa with up to 30 spinelike setae on anterior aspect. Trochanter 

 with 8 to 10 spinelike setae on medioanterior surface, 7 to 9 such setae 

 on posterior surface. Femur with 12 or 13 spinelike setae on medio- 

 anterior surface, 6 or 7 spinelike setae on posterior aspect. Tibio- 

 tarsus with 6 to 8 spinelike setae on medioanterior surface and 5 to 8 

 such setae on posterior surface. Ungula, when uneroded, as long as 

 tibiotarsus. 



On ninth abdominal segment, distance between posterior margin 

 of pleural area and anterior margin of caudal notch approximates 

 one-eighth of total length of segment, exclusive of urogomphi. 



Urogomphi as figured for homhycinus (Germar) (fig. 20, d, /). 

 Inner prong of urogomphus large, twice as long as outer prong; di- 

 rected dorsocaudad, terminating in sharp, upturned point; with 2 

 prominent setae, i on lateral aspect, the other on midventral area. 

 Outer prong short, robust; directed dorso-caudolaterad, with short, 

 horny tip turned mediad; with 2 large setae, i on anterior aspect, 

 the other laterally at base of prong; a few fine, short hairs around 

 distal half of prong. Undivided part of urogomphus with i large 

 seta ventrally, just anterad to base of inner prong. 



Caudal notdh large, U-shaped, slightly longer than wide. 



Tenth abdominal segment with about 20 fine setae in irregular 

 whorl. 



Material used in study. — Only one specimen was used. Three 

 larvae of this type were collected from under a stone, along with 

 two adults of this species, but two of the larvae died and disintegrated 

 too badly for use in the study. Since the relationships of this species, 

 based upon adult characters, agree with the evidence deduced from 

 this larva, it is believed that the larva is reliably named. The ma- 

 terial was taken at Kamloops, British Columbia, and the adults were 

 identified by W. J. Brown, of Ottawa. The larva is deposited in the 

 Canadian national collection. 



LUDIUS BOMBYCINUS (Germar) 



FiGUKE 20, d, f 



Diacanthus bonibycinus Germar, Zeitschr. fiir die Ent., vol. 4, p. 70, 1843. 

 Ludius bomhycinus (Germar), Brown, Canadian Ent, vol. 68, p. loi, 1936. 



This species is known from Oregon, Washington, British Columbia, 

 and the mountainous southwest of Alberta. Nothing is known of 



