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maxillæ having plenty of setæ, etc., a quite remarkable trans- 

 formation for an Elaterid larva. — Among the typical larvæ 

 I distinguish 2 groups: Agrypnini*) et Elaterini: Agrypnini 

 having mandibulæ without retinaculum, submen- 

 tum triangular, nasale 3-divided, the sclerits of ster- 

 num separated one of another, the head having many 

 muscular furrows, while in Elaterini the mandibulæ have 

 retinaculum, subraentum is linear with parallel 

 sides, nasalo terminating in 1 tooth or 3-dcnted, the scle- 

 rits of sternum always melted together and the head on 

 the upper side only with 1 pair of short furrows. — I 

 cannot find out that the larvæ show any further division 

 of Elaterini, as do the Imagines. — Cardiophorus surely can 

 be ranged among the Elaterini, to which subfamily the imago 

 belongs (Schiødte describes it among his descriptions of 

 Agrypnini, because the anal tube has claw-shaped protuberan- 

 ces), the submentum being linear and on the inner edge of the 

 dorsal mandibular branch is situated several teeth of which 

 surely 1 must be regarded as retinaculum. 



Key to the genera. 



1. Abdomen whitish, soft, elongate, etc. (see above and 



figg. 4 — 6) Cardiophorus 



At least the terga of abdomen strongly chitinized 2. 



2. Submentum triangular. Retinaculum wanting . . 3. 

 Submentum rather linear. Retinaculum present . 4. 



3. 9*'' abdominal segment above transversally rugose . Lacon 

 9'*' abdominal segment above with many little tu- 

 bercles (Adelocera) 



4. 9**^ abdominal segment at the apex simply rounded 



or with an impair terminal tooth 5. 



9'*' abdominal segment ending in two short cerci . 13. 



5. 9*^ abdominal segment ending simply rounded . . 6. 

 9*^ abdominal segment ending in a terminal tooth 7. 



'^) Among the foreign forms the group Hemirrhipini s. s. (Alaus, 

 Chalcolepidius) shows the same characters as Agrypnini (Lacon, 

 Agrypnus, Adelocera). 



