THE COMB-CLAWED BARK BEETLES. 1277 



distinctly widci* tlinii tlmrnx. sides suliii;ii;ili('l ; suii'ncc witli I'titlicr deeply 

 iinpressod rows of close-set imiul ures ; intervnls luMrly ll;it, liiiely and 

 densely imnctalo. ^lale with stontei- auleinue and with last ventral segment 

 deeply excavated. Length G-7.5 nun. 



Marion, Hanoock .md Putnam oonnties; rare. May 30-July 15. 

 Occurs beneath l)ai'k. One of tlie three specimens has the legs 

 wholly reddish-yeHow. In the olliei' two tlic iVoiil .nid middle fem- 

 orn and tihitp are piceons. 



TV. TsoMiRA :\hils. IS.in. rOr.. "alike i part.") 



Kather small, oval l)r()wnish s[)ecies, luninii' tlie antennte slender 

 and filiform, the third joint nsually nearly eciual to fourth. Of the 

 thirteen species recognized from the United States tlie following 

 have lieen taken or should oecuf in the State: 



KKY TO INDIANA SPI'X'IES OF ISOMIRA. 



(/. Above bicolored ; head and elytra i)iceons-black, thorax reddish-brown. 



RUFICOLI.IS. 



aa. Color al)ove nniforin or nearly so. 



b. Fonrth joint of maxillary palpi long and slender; olytral i)nnctnation 

 and pubescence exceedingly dense; color pale oehreons yellow 

 throughout. 2:',CA. skiucea. 



hh. Fourth joint of maxillary palpi rol)Ust, the outer side but slightly 

 longer than apex. 

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

 sparse; third and fourth antennal joints e(iual in the sexes, or 

 the third slightly longer than the fourth. 

 (1. Eyes small, separated by three times their width; length G- 

 G.5 mm. L'oG.5. quadristriata. 



(Id. Eyes large, coarsely graimlatod, se^parated by less than twice 

 their width; length 7 mm. 2,36G. similis. 



vc. Elytra with fine but distinct impressed lines throughout the full 

 len.gth. their punctuation dense; third antennal joint one-fourth 

 shorter than fourth. 23G7. oblongula. 



I. vKficoUis Ham., length -i.2-.5.2 mm., is known from near Alle- 

 gheny, Pennsylvania, and Cincinnati, Ohio. 



23G4 (7G07). Isomiba sericea Say, Journ. Phil. Acad. Nat. Sci., Ill, 1S24, 

 270; ibid. II, 150. 

 Elongate-oval. Pale brownish-yellow throughout, feebly shining ; clotht'd 

 with fine, dense and short pubescence. Antenn;e 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. ;is well as that of el.vtra, densely 

 and finely punctured. Elytra w ith two or three feebly impressed stri;e near 

 the suture, these more strongly marked near apex. Length 5-.^>.r) mm. 



Throughout the State; conunon. ]May ll-Septemher 12. Oc- 

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



