THE COMB-CLAWED BARK BEETLES. 



1273 



fourth strongly lobed. Length 9-10 mm. 



Throughout the State; scarce. June 12-August 11. Occurs on 

 dry twigs and beneath bark. 



' A. atra Say, black, shining, tarsi paler, length 7.5 mm., is a mem- 

 ber of the Alleghanian fauna. 



II. Hymenorus Muls. 1851. (Or,, "membrane + margin.") 

 Smaller oblong or oval species, having the last joint of maxillary 

 palp" t tie form of a right angled triangle with the apex and outer 

 skle subequal in length; lobes of the tarsal joints less developed 

 52 £2KU the front and middle tarsi never ha^e ta 

 two joints lobed and the hind tarsi wtth but one. Seven species 

 have been recognized from Indiana, while another may occur. 



KEY TO INDIANA SPECIES 0E HYMEN ORE'S. 



- „. Thorax sparsely and usually rather finely punctured; upper surface 



B . ""antennal Joint of male equal or subeoual in iength to fourth. 

 n i^ivtral striae obsolete toward the apex. . ^ 



.rSytf with a large reddish spot each side at base ; length 4.5 mm. 



Cl. HiiyUa Willi a icu-g, HUMERALIS. 



w/7 wivtra uniform in color throughout. 



~?Sn* brown, tibia, and tarsi paler; antenn, on. a 

 as long as body ; larger, 7-8 mm. pi 

 ee. Femora reddish-yellow, tibia- darker; antennae t« 



thirds the length of fourth; thorax narrower than base ot eiy 

 thucls me ieu &L Li u ^ s perforattjs. 



f , -e length of body *. third 



• • f flf mniP hut slightly longer than second; thoiax at oase 

 joint of male but siignuj b BSCURts. 



„, W^l^SSU Punctured; upper surface less shin- 



^tenme stent, third and fourth Joints subequa, ; ^>arge in male 

 separated by a distance less than one-third t^^J^ 



