71 S FA\rTT.Y XXX VIT. ELATET! r fJ/TO. 



than in oculatus, their nmigins of grayish hairs indistinct Elytra finely 

 but distinctly striate, densely and finely granulate-punctate. Length 24- 

 08 mm. 



Pine, l.ake County; rare. June 6. One specimen taken by 

 Woleott from beneath bark of pine. Common in the Southern 

 States ; rare north of the Ohio Eiver. 



Tribe III. HEMIRHIPIXI. 

 This tribe is roprrsentr-d in the r-astf-rn ijiited States by the 

 single species nrinirhipus f(i.-;cirnh:rl<< Fab., a large black bi-ptle, 

 having the elytra dull yel]o\\'. varied with small dusky spots and 

 densely elothed with short bro\^Ti pubesc-enee; li-n^h 19 mm. It 

 has been taken near Cincinnati anii should be looked for in south- 

 ern Indiana. 



Tribe IV. ELATERINI. 



By far the larfffr number of our native click beetles belong to 

 this tribe. The 3s genera which compose it differ widely in variotLs 

 peculiarities of structure, but all agree in having the prosternum 

 devoid of antennal grooves ; mesostcrnal suture distinct : side pieces 

 of metathorax narrow and the mandibles short, never extending 

 far beyond the labrum. In order to shorten the generic keys, the 

 tribe is divided into two subtribes, defined as follows: 



KEY TO SCBTBUJES OF ELATERINI. 



a. Hind coxal plates suddenly dilated about the middle, the outer part 



much narrower than the inner. Subtritje A. Elateeixi. p. 718. 



aa. Hind coxal plates gradually, sometimes scarcely, dilated on the inner 



side. Subtribe B. Cobymbitini, p. 737. 



Subtribe A. (Elaterixi.) 



In addition to the suddenly dilated plates of hind coxa-, the 

 members of this subtribe have a .strong tooth at the insertion of the 

 thighs; the prosternum lobed in front; mandibles emarginate or 

 toothed at tips ; tarsal claws very rarely serrate. Of the 19 genera 

 composing the subtribe representatives of fourteen have been taken 

 in Indiana, while those of one other doubtless occur. 



KEY TO I.XDIAXA GE>-ERA OF ELATEBIXI. 



o. Margin of the front elevated behind the labrum ; size small or medium, 

 rarely over 14 mm. 

 y. Prr.sternal spine truncate at upe.x. fitting like a wedge into the deeply 

 cleft notch <.r mesosternum ; scutelluni heart-shaped, 

 f. T:irsi simple, net lobed beneath. 

 d. Marginal line on side of thorax becoming inferior, not visible 

 from above ; body winged, elytra free. XVI. (■AriinoPHORus. 



