71S I'WMII.Y XXWn. 1:T. ATKIMD.K. 



IlKUi ill octilulus. tlu'ii' lunrunns of i,'rtiylsli Imirs indistinct. Elytm finely 

 lint distinctly striate, densely au<l liuely granulate-punctate. Length 24- 

 08 mm. 



Pjiic. liiikc ('(iuiilv; rare. .June 6. One specimen taken by 

 Woleott from henealh l)ai'k of pine. Common in the Sontheru 

 States; rare noi'Hi of the Ohio River. 



Tribe III. HEMIRHIPINT. 



Tliis tribe is j-cpresenled in the eastei'n Tnited States l)y tlie 

 single species J/( iiilrliijtiis /'dscit'iihiris Fal).. a hirge I)hi('k l)eetU\ 

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

 densely clothed with short brown pul)escenee ; length ]9 mm. It 

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

 ern Indiana. 



Tribe IV. ELATERINI. 



By far the larger lUTmber of our native click beetles l)elong to 

 this tribe. The 88 geiiera which compose it differ widely in various 

 peculiarities of structure, but all agree in having the prosternum 

 devoid of antenna! gi-ooves; mesosternal suture distinct; side pieces 

 of metathorax narrow and the mandibles short, never extending 

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

 tribe is divided into two subti'ibes, defined as follows: 



KEY TO SUBTRIBES OF ELATERINI. 



*/. Ilind coxal plates suddenly dilated almut the middle, the outer part 



much narrower than the inner. Subtribe A. Elaterini, p. 718. 



int. Ilind coxal plates gradually, sometimes scarcely, dilated on tlie imu'r 



side. Subtribe B. Corymbitini, p. 737. 



Subti'il)e A. (Elaterini.) 



In addition to the suddenly dilated plates of hind coxas, the 

 members of this sul)trilie have a strong tooth at the insertion of the 

 thighs; the prosternum ]oI)ed in i'roiit; mandibles emarginate or 

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

 composing the subtri])e representatives of fourteen have been taken 

 in Indiana, while those of one other doubtless occur. 



KEY TO INDIANA GENERA OF ELATERINI. 



a. Margin of th(» t'l-ont (>levated behind tlie labrum; size sm.-ill or medium, 

 rarely (iver II iiini. 

 h. I'rosternal spine truncate at apex, fitting like a wedge into the deeply 

 cleft notch of mesosternum ; scutellum heart-shaped. 

 c. Tarsi simple, not lobed beneath. 



(I. Marginal line on side of thorax becoming infei'ior, not visil)le 

 from above; bodv winge<l, elvfra free. XVI. Cahdiopiiorus. 



