71 S FAMILY XXXVfl.- KLATl'MMIi.K. 



than iii ociilatus, their margins of grayish hairs indistinct. Elytra finely 

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

 38 mm. 



Pine. Lake County; rare. June 6. One specimen taken by 

 Wolcott from beneath bark of pine. Common in the Southern 

 States ; rare north of the Ohio River. 



Tribe III. HEMIRHIPINI. 



This tribe is represented in the eastern United States by the 

 single species Jlonirkipas faxciculaiis Fab., a large black beetle, 

 having the elytra dull yellow, varied with small dusky spots and 

 densely clothed with short brown pubescence; length 1!) mm. It- 

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

 ern Indiana. 



Tribe IV. ELATERINI. 



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

 this tribe. The 38 genera which compose it differ widely in various 

 peculiarities of structure, but all agree in having the prosternum 

 devoid of antennal grooves; mesosternal 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 SUBTRIBES OF ELATERINI. 



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



much narrower than the inner. Subtribe A. ELATERINI. p. 718. 



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



side. Subtribe B. CORYMBITINI, p. 737. 



Subtribe A. (ELATERINI.) 



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 INDIANA GENERA OF ELATERINI. 



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



rarely over 14 mm. 

 1). Prosternal spine truncate at apex, fitting like a wedge into the deeply 



cleft notch of mesosternum ; scutellum heart-shaped. 

 c. Tarsi simple, not lobed beneath. 



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

 from above; body winged, elytra free. XVI. CARDIOPHORUS. 



