748 FAMILY XXXVII. ELATEKTD^E. 







d. Clypeus flat or slightly concave; thorax slightly wider at middle 

 than elytra, strongly narrowed in front ; length 14-17 mm. 



1415. FISSILIS. 



dd. Clypeus strongly concave ; thorax not wider at middle than elytra ; 

 length 15-17 mm. 1416. CANADENSIS. 



ad. Hind angles of thorax with but one carina. 



c. Fourth joint of antenna? at least one-third longer than third. 

 /. Size larger, 12.5 or more mm. ; form rather robust. 

 g. Surface of thorax sparsely and rather finely punctate, the sides 

 straight from base to near apex ; clypeus snbangulate at apex ; 

 length 12.5-14 mm. 1417. SAGITTARIUS. 



fjg. Surface of thorax, at least on sides, coarsely and rather densely 

 punctured ; sides more or less rounded toward apex ; clypeus 

 broadly rounded; elytral intervals coarsely and distinctly punc- 

 tate; length 14-15 mm. 1418. DIFFICILIS. 

 ff. Size smaller, not over 12 mm. ; form usually much more slender. 

 It. Thorax very finely and so densely punctate as to make the sur- 

 face dull ; pubescence short, erect ; length 10-11 mm. 



OPAC'ICOLLIS. 



lili. Thorax normally punctate, the punctures either much more 



sparse or much coarser. 



/. Surface closely pubescent with long gray prostrate hairs; ely- 

 tra but slightly narrowed from base to apex; length 10- 

 11.5 mm. 1419. PILOSUS. 



U. Surface sparsely pubescent with much shorter hairs; elytra 



(except in macer) distinctly narrowed behind the middle. 

 j. Carinae of hind angles very long, and close to margin ; third 

 joint of antennae one-half longer than second, the two to- 

 gether slightly shorter than fourth ; length 11 mm. 



1420. CARINUS. 

 jj. Carinae of hind angles not reaching middle of thorax; third 



joint more than one-half longer than second. 

 7r. Length not more than 9 mm. ; form very slender. 



7. Clypeus rounded in front, convex; thorax short, not 



longer than wide. 1421. TRAPEZOIDEUS. 



//. Clypeus subtruncate, concave ; thorax more slender, 



longer than wide. 1422. PRASINUS. 



A7r. Length 10-12 mm. ; form more robust. 



m. Clypeus strongly concave; sides of thorax straight; ely- 

 tra parallel or nearly so. 1423. MACEK. 

 nun. Clypeus Hal or subconvex; sides of thorax more or less 

 rounded ; elytra distinctly narrowing behind the mid- 

 dle. 



11. Dark reddish-brmvii or fuscous; disk of thorax coarse- 

 ly and rather sparsely punctate. 



1424. VERBERANS. 



mi. Pale reddish-brown; disk of thorax very finely and 

 more sparsely pimrlate. 14lT. ANGUSTATUS, 



<c. Fourth joint of antenna 1 but little, if any. long#r than third. 



