THE METALLIC WOOD-BORING BEETLES. 797 



under a of the above key. If the lower lobes of the tarsal claws are 

 bent inward as shown in No. 5 of Fig. 307, the insect belongs t<> 

 Group A. 



KEY TO INDIANA SPECIES Of GKOUP A. 



a. Prosternum parallel between and behind the front coxse, the apex ob- 

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

 gles distinct ; length S or more mm. 



b. Thorax without a white pubescent space on sides; tips of elytra 



evenly serrate. 1512. DIFFICILIS. 



hi). Thorax with elongate space of dense whitish pubescence on sides; 

 tips of elytra ending in a short, sharp spine, unevenly serrate. 



1513. FERIUSI. 

 mi. I'rosternum gradually narrowing, the apex acute. 



c. Last dorsal segment carinate, the carina prolonged at tip ; length 5.5- 



7 mm. 



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



nate in either sex. 1514. RUFICOLLIS. 



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

 female only. LATEKALIS. 



cc. Last dorsal segment not carinate. 



e. Male with inner apical angle of tibia? 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. CRINICOBNIS. 



ff. Antenna? stouter, not pilose on the outer side; front of head and 



sides of thorax greenish. 1515. OTIOSUS. 



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



impressed ; length 5-9 mm. 



ff. Males with a densely pubescent space on middle of prosteruuin ; 

 color uniform dull olive-green or slightly brassy. 



1516. MASCULINUS. 



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

 brassy or slightly greenish. 1517. ARCUATUS. 



1.112 (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 pubescent spots 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, 

 basal fovere feeble, disk with faint cost;e, surface with imbricated scales. 

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



Marion and Posey counties; scarce. June 10-July 21. 



1513 (- -). AGRILUS FERRISI Dury, Entoni. 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 ab- 



