THE COMB-CLAWED BARK BEETLES. 1277 



distinctly wider than thorax, sides subparallel ; surface with rather deeply 

 impressed rows of close-set punctures; intervals nearly flat, finely and 

 densely punctate. Male wilh stouter antenna' and with last ventral segment 

 deeply excavated. Length 6-7.5 mm. 



Marion, Hancock and Putnam counties ; rare. May 30- July 15. 

 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. ISOMIRA Mills. 1856. (Gr., "alike i part,") 



Rather small, oval brownish species, having' the antenna? slender 

 find 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: 



KKY TO INDIANA SPECIES OF ISOMIRA. 



. Above bicolored ; head and elytra piceous-black, thorax reddish-brown. 



RUFICOLMS. 

 a a. Color above uniform or nearly so. 



1). Fourth joint of maxillary palpi long and slender; elytral punctuation 



and pubescence exceedingly dense; color pale ochreous yellow 



throughout. 2.364. SKRTCKA. 



1>1>. Fourth joint of maxillary palpi robust, the outer side but slightly 



longer than apex. 



c. Elytra without impressed lines on basal half, their punctuation 

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

 the third slightly longer than the fourth. 



(I. Eyes small, separated by three times their width ; length 6- 



6.5 mm. 2.",65. QUAIUUSTRIATA. 



<l<l. Eyes large, coarsely granulated, separated by less than twice 



their width; length 7 mm. 2366. si. \IILIS. 



<<. Elytra with tine but distinct impressed lines throughout the full 



length, their punctuation dense; third antennal joint one-fourth 



shorter than fourth. 2367. OBLONGULA. 



/. nificollis Ham., length 4.2-5.2 mm., is known from near Alle- 

 gheny, Pennsylvania, and Cincinnati, Ohio. 



2364 (7607). ISOMIRA SERICEA Say. Jonrn. Phil. Acad. Nat. Sci., Ill, 1X24, 



270; ibid. II, 159. 



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

 with tine, dense and short pubescence. Antenna 1 two-thirds as long as body, 

 the third and fourth joints equal. Thorax one-half wider than long, sides 

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

 and one-half the width of base: surface, as well as that of elytra, densely 

 and finely punctured. Elytra with two or three feebly impressed stri.-e near 

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



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

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



