THE METALLIC WOOD-BORING BEETLES. 797 



uiidci- (I of llir Jihovo l<('y. ir tlic lower lobes of the 1;irsal cbiws arc 

 hciit inward as sliowii in Xo. "> oi" Fjo'. :{()7, the insect hclonii's to 

 ({roup .1. 



KEY TO INDIANA SriXMES OF CKOl'P A. 



(/. rrostoniuiii parallel between and behind the front cox;c, the apex ob- 

 tuse or truncate; thorax not impressed at middle, carina of hind an- 

 gles distinct ; length 8 or more mm. 

 b. Thorax without a wliite pulu'scent space v>n sides; tips of elytra 

 evenly serrate. 3512. difficilis. 



hh. Thorax with elongate sjtace of dense whitish [lubescence on sides; 

 tips of elytra ending in a siiort. sliarp spine, unevenly serrate. 



1513. FERKISI. 



(/(/. rrosternum gradually narrowing, the apex acute. 



('. Last dorsal segment earinate. the carina prolonged at tip; length 5.-5- 



7 mm. 



(1. Front with a deep median furrow; hind angles of thorax not cari- 



nate in either sex. 1514. ruficollis. 



(/(/. Front feebly impressed; hind angles of thorax slightly carinate in 



female only. lateralis. 



cc. Last dorsal segment not carinate. 



c. Male with inner apical angle of tibi;e on all three pairs of legs 

 terminating in a sharp incurved spine ; form slender ; length less 

 than 5.5 mm. 

 /. Antennae very slender with a fringe of long hairs on the outer 

 side; color olive-bronze. crinicornis. 



ff. Antenn.ie stouter, not pilose on the outer side; front of head and 

 sides of thorax greenish. 1515. otiosus. 



ec. Hind tibiae of males not terminating in a spine; head not or feebly 

 impressed; length 5-9 mm. 

 g. Males with a densely pubescent space on middle of prosternum ; 

 color uniform dull olive-green or slightly brassy. 



1516. MASCULINUS. 



ffff. Males with prosternum but slightly pubescent; head and thorax 

 brassy or slightly greenish. 1517. arcuatvs. 



1512 (4725). Agrilus difficilis Gory, Mon. Buprest., Supp., 1837, 224. 

 Elongate. Piceous with a greenish or cupreous lustre, metallic beneath ; 



abdomen with two rows of yellowish pubesc-ent six)ts on each side, one row- 

 above the lateral suture and partly visible from above. Front flat, occiput 

 slightly impressed. Thorax broader than long, sides slightly curved, disk 

 with a feeble oblique depression on sides and another in front of scutellum ; 

 surface rather finely transversely strigose, punctate at apex; hind angles 

 with a rather strong curved carina. Elytra with tips rounded, finely toothed, 

 l>asal fovere feeble, disk with faint costa?, surface with imbricated scales. 

 Prosternal lobe rounded, acutely emarginate. Length 9-13 mm. 



]\rarioii and Posey counties; scarce. .June 19-Jiily 21. 



1513 ( ). Agrilus ferrisi Dury, Entom. News, XIX, 1908, 368. 



Resembles difficilis. Differs by having the front of head and sides of 



under surface densely covered with white, wool-like pubescence, that on ah- 



