THE COMB-CLAWED BARK BEETLES. 



1277 



distinctly wide, than thorax, sides snhparallel; ^^^^ 

 impressed rows of close-set punctures; intervals ^^.^^^S 

 densely punctate. Male with stouter antenna, and with last vential segment 

 deeply excavated. Length 6-7.5 mm. ^ on Tnlv 1 ^ 



Marion Hancock and Putnam counties; rare. May 30-Juiy id. 

 Occurs beneath bark. One of the three specimens has the legs 

 wholly reddish-yellow. In the other two the front and middle fem- 

 ora and tibise are piceous. 



IV. IsomiraMuIs. 1856. (Gr, "alike + part.") 

 Rather small, oval brownish species, having the antennae slender 

 and filiform, the third joint usually nearly equal to fourth Of the 

 thirteen species recognized from the United States the following 

 have been taken or should occur in the State : 



KEY TO INDIANA SPECIES OE ISOMIEA. 



a. Above bieolored; head and elytra piceous-black, thorax >^£^ 



a a Color above uniform or nearly so. 



6 Fourth joint of maxillary palpi long and slender; elytral punctuation 

 and pubescence exceedingly dense; color pale ochre^ yeUo, 



». FourtMotot of maxillary palpi robust, the outer side but slightly 



e K^oSTtopresSed lines on basal half, their punctuation 

 sparse; third and fourth antennal joints equal in the sexes, or 

 the third slightly longer than the fourth. 

 a Eyes small, separated by three times their width; length 6- 



" * 2365. QUADEISTKIATA. 



U. Eye! Ta'ge, coarsely granulated, separated by 



their width ; length 7 mm. ^ OD - . 



ce Elvtra with fine but distinct impressed lines throughout the full 

 length their punctuation dense; third antennal joint one-fourth 

 shorter than fourth. 

 I. ruficollis Ham., length 4.2-5.2 mm, is known from near Alle- 

 gheny, Pennsylvania, and Cincinnati, Ohio. 



2364 "(7607). Isomira sericea Say, Journ. Phil. Acad. Nat. Sci., Ill, 1824, 

 270; ibid. II, 159. 



Elongate-oval. Pale brownish-yellow throughout, feebly shining ; clothed 

 wi th Sense and short pubescence. Antenme two-thirds as long as ^ 

 the third and fourth joints equal. Thorax one-half « 

 straight and parallel to middle, thence rounded to apex which s truncate 

 and one-half the width of base; surface, as well as that of elytra dense!. 



u fin ly punctured. Elytra with two or three feebly imp^ . ^ near 

 the suture, these more strongly marked near apex. Length 5-5.5 mm. 



Throughout the State ; common. May 11-Septemher 12. Oc- 

 curs on flowers of Jersey tea, wild hydrangea, etc. 



