OF WASHINGTON, VOLUME XVII, 1915 183 



of Dr. Boving who assisted me in many \v;iys in this investiga- 

 tion, I have been "able to examine. They are quite absent from 

 H. uhlerii. 



The mandibles of C. asselus have a pair of stout teeth on the 

 distal end, and two teeth on the inner face of each dorsal rainus, 

 while in H. uhlerii the distal end of this ramus is rounded and 

 the inner face bears three stout teeth with two smaller accessory 

 teeth. The clypeus of C. asselus bears seven pair of dorsal hairs, 

 while that of H. uhlerii, bears but four pair. The tibia of C. 

 asselus is armed with two terminal spines, that of H. uhlerii 

 with three, the tarsus of the former with one basal spine while 

 the latter has three. 



Schiodte in his classification says that the spiracles are tubu- 

 lar, this conclusion being probably drawn from their proximity 

 to the lateral ambulatory papilla, which are retractile; the spir- 

 acles are however of the true biforian type and are situated a 

 little behind the papillae, not on them. 



I agree with Henriksen in believing that Schiodte was wrong 

 in classifying this tribe with his subfamily Agrypninse. He based 

 his conclusions on a mistaken interpretation of the anal lobes. 

 In his preserved specimen these are partly retracted so that they 

 give the appearance of a membranous anal hook, which charac- 

 ter he quite correctly used to limit his group Agrypninae. I dif- 

 fer from Henriksen however, as he considers them in the sub- 

 family Elaterinse, in which subfamily the adults have always 

 been placed. I believe the Cardiophorini of authors should a1 

 least be raised to equal rank with the other greater subfamilies of 

 the Elateridse (sensu stricto) and it may be eventually necessary 

 to place this tribe in some higher ordinal catagory. 



EXPLANATION OF PLATES. 



Horistonotus uhlerii Horn, (larva). 

 PLATE XX. 



Fig. a. Ventral aspect of head. 



Fig. b. Dorsal aspect of head. 



Fig. c. Lateral aspect of mouthparts, mandible removed. 



Fig. d. Ventral aspect of right mandible. 



Fig. e. Outer aspect of right mandible. 



Fig. f. Inner aspect of right mandible. 



Fig. g. Dorsal aspect of right mandible. 

 PLATE XXI. 



Fig. a. Dorsal aspect of larvn . 



Fig. b. Lateral aspect of middle part of fourth abdominal segment. 



Fig. c. Lateral aspect of ninth and tenth abdominal segments. 



Fig. d. Left mesothoracic leg. 



Fig. e. Ventral aspect of eighth, ninth and tenth abdominal seg- 

 ments. 



