THE JIELAXDRYID BARK BEETLES. 1291 



Throughout the State; frequent. ;\Iay 12— July 31. Occurs be- 

 neath bark and on dead limbs. The prosternum is prolonged nearly 

 as much as in the click beetles of the genus Mflanotua. some of 

 v.hich it closely resembles. However, the cavity in the mesosternum 

 is much more shallow. 



Tribe IV. JIALLODRYINI. 



This tribe is also represented by the single genus Mallodrya 

 Horn, formed for a "rather inconspicuous species, 31. suhcenea 

 Horn, resembling a depressed Mchindrya or an Emmesa, from 

 which it differs by the slender tarsi, the penultimate joint not being 

 exeavate-emarginate and the front tarsi not dilated in the males." 

 It is oblong, piceous, with faint aeneous surface lustre, and 6 to S..') 

 mm. in length. The types were taken by Dury near Cincinnati, 

 who found them rather abundant on the branches of dead honey- 

 locust. It probablj' neeurs in the southeastern part of Indiana, but 

 no specimen has been seen from the State. 



Tribe V. ORCHESIINI. 



Eather small oval, convex form.s. havinu' the liead vertically dc- 

 flexed; antennnp 11-jointed, the joints gradually thickened, except 

 in JlicroscapJia. where they end in a distinct club; front coxse oval, 

 separated by the prosterniun; tarsi filiform, claws simple. Four of 

 the five genera, recognized by Horn as composing the tribe, are 

 known to be represented in the State, while the single species of the 

 other may occur. 



KEY TO IM)I.\X.V GEX'EIi.V OF ORCHESIIXr. 



n. Spurs of bind tibia' small or moderate, not serrate, but df leu witb trans- 

 verse ridges. 

 h. Hind coxte not oblique; form o-sal. 



e. Elytra witb rows of mnderatu or coarse puurtures; pvustern-rii 

 narrowing to a point and not prolonged behind the C(px:e. 



VI. EU.STROPHl s. 



cc. Elytra finely and irregularly punctured; prosternum prolonged l)f- 

 biud tbe e(>x;e and separating tbem, tbe ajiex slightly broader. 



VII. HOLOSTROPHUS, 



1/h. Hind coxje oblique; form oblong-oval; length less than o mm. 



VIII. HAIXOMEXrs, 



an Spurs of hind tibi;e large, the inner one very long, pectinate. 



d. Second antenual joint normal. IX. Ok(iiesi-\. 



(Jih Second antenual joint thickened ; autennte strongly clavate. 



MiCEOSCAPHA. 



