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ed above but also it terminates into an impair tooth, — 

 In the biconvex larvæ it is always flattened above, the side 

 edge being carinate prominent, with a row of 3—4 more 

 or less acute upwardsbending teeth, (only Lacon has more 

 teeth, and in Limonius and Pheletes they are reduced to 

 very indistinct tubercles), and terminates posteriorly in a 

 pair of very short cerci which always are simply immovable 

 chitinous protuberances of the 9**^ abd. segm. never jointed 

 to it. Between these ceici there is a more or less rounded 

 space with an aperture narrower in the rear, because 

 the cerci or when they are bifid their inner prongs are 

 converging posteriorly or straight inwards directed. 



Typically, the muscular impressions on 9*^^ abd. segm. 

 are consisting of a part agreeing with the transversal branch 

 but only distinctly developed in Elater, Melanotus, Ectinus 

 and — curiously eye-shaped — in Agriotes, and 2 pairs of 

 longitudinal furrows more or less developed or reduced in 

 the different forms. 



The last, 10*'' abdominal segment, the anal tube, 

 is little and placed at the tip of the most often very little 

 sternal part of 9**' abd. segm., so that it in the most cases 

 fixes under the anterior third of this segment. In Agrypnini 

 the anal tube has 2 or more dark chitinous hooks, in the 

 Danish only 2 claw-shapod and rather short ones, and Car- 

 diophorus also has 2 such »hami scansorii«, but here they 

 are pale and long, longer than the anal tube. 



The legs have large conical coxæ, on the anterior side 

 set with more longitudinal rows of short strong setæ; tro- 

 chanter, femur and tibia also are set with a few longitudi- 

 nal rows of short setæ, these however on trochanter standing 

 more disorderly. The legs ends in a claw- shaped tarsal 

 joint, without any real claw. 



Regarding the systematism of the larvæ, Cardiopho- 

 rus larva is a very aberrant form quite diH'ering from the 

 discription just given as the common one for Elaterid larvæ. 

 The form of its body much elongated and vermiform, the 

 soft abdomen, the curious cleft mandibulæ, the cardines of 



