THE METALLIC WOOD-BORING BEETLES. 799 



hind the middle, between which they are slightly flattened; tips rounded, 

 tinely serrulate; basal depressions distinct, surface densely covered with 

 scales. Prosternal lobe obtuse, faintly emarginate. Length 4-5.5 mm. 



Throughout the Stato; common. I\Iay 13-August 13. Occurs 

 especially on foliage of oak and hickory. 



1516 (10.112). Agrilus masculinxis Horn, Trans. Amer. Ent. Soc, XVIII, 

 1891, 295. 

 Rather slender, more robust than utiosus. Dull green or slightly brassy, 

 feebly shining; antennje greenish. Occiput feebly impressed, male; distinct- 

 ly so, female; front densely punctate. Thorax slightly wider than long, a 

 little narrowed at base, side margin sinuate; hind angles with a distinct 

 carina ; disk with au oblique depression on each side and two faint ones on 

 median line; surface fluely, transversely strigose, punctate. Elytra obtuse 

 at apex, finely serrate; disk with an indistinct costa on each side; basal 

 depressions shallow ; surface with close scales. Prosternal lobe broadly and 

 rather deeply emarginate. Length 6-7 mm. 



Kosciusko and IMarion counties; scarce. May 23-June 8. Oc- 

 curs on foliage of buckeye. 



I.'.IT (4720). Agrilus arcuaxus Say, Ann. Lye. Nat. Hist, I, 1825, 251; 

 ibid. I, 387 ; II, 596. 

 Moderately elongate, rather robust. Dark olivaceous; head and thorax 

 brassy or cupreous; sometimes (var. cori/li) the whole upper surface uni- 

 form bright brassy. Front moderately impressed from occiput nearly to 

 base of clypeus, coarsely and rather closely punctate. Thorax one-fourth 

 wider than long, not narrowed at base; disk with two depressions on me- 

 dian line and a large oblique one each side; hind angles with a curved 

 carina, more distinct in female; surface transvei'sely strigose with punc- 

 tures in depressions. Elytra dilated behind the middle, tips separately 

 rounded, finely serrulate, sutural edge elevated behind the middle; surface 

 rather densely scaled. Prosternal lobe broadly emarginate. Length 5-9 mm. 



Throughout the State; frequent, ^lay 28— July 21. Occurs on 

 foliage of oak and other trees, usually along the margins of marshes 

 and lakes; var. coryli on hazelnut. 



Group B. 



In this group the antennie are serrate as in Group A, but the 

 tarsal claws are cleft or almost bifid, with the inner portion not re- 

 curved. (Fig. 307, Nos. 6 and 7.) 



KEY TO INDIANA SPECIES OF GROUP B. 



a. Last dorsal segment with a projecting carina. 



ft. Front deeply impressed ; head and thorax coppex'y red, elytra black ; 

 hind angles of thorax not carinate ; coxal plates not pubescent. 



VITTATICOLLIS. 



hh. Front convex or feebly impressed ; color uniform. 

 [51—23402] 



