748 FAMILY XXXVII. ELATEKTD.E. 



(/. Clypt'iis fiat or slisflitly concave; thorax slightly wider at middle 

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



1415. FISSILIS. 



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

 length 15-17 mm. 1416. canadensis. 



(Kt. llhid angles of thorax with but one carina. 



c. Fourth joint of autennre 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 subangulate at apex ; 

 length 12.5-14 mm. 1417. Sagittarius. 



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

 punctured ; sides more or less rounded toward apex ; cljiieus 

 broadly rounded; elytral intervals coarsely and distinctly punc- 

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

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

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

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



OPACICOLLIS. 



////. Thorax normally punctate, the punctures either much more 

 sparse or much coarser. 

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

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

 11.5 mm. 1419. pilosus. 



//. Surface sparsely pubescent with much shorter hairs; elytra 

 (except in maccr) distinctly narrowed behind the middle. 

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

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

 gether slightly shorter than fourth ; length 11 mm. 



1420. CARINUS. 



;■;• Carime of hind angles not reaching middle of thorax ; third 

 joint more than one-half longer than second. 

 7i'. Length not more than 9 mm. : form very slender. 



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



longer than wide. 1421. trapezoideus. 



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



longer liian wide. 1422. prasinus. 



kk. Length 10-12 nun.; form more robust. 



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

 tra parallel or nearly so. 1423. macer. 

 iinii. Clypeus fiat or subconvex ; sides of thorax more or less 

 rounded; elylra distinctly narrowing Itehind the mid- 

 dle. 

 ». Dark reddish-brown or fuscous; disk of thorax coarse- 

 ly and rather sparsely punctate. 



1424. verberans. 

 vn. Tale reddish-brown; disk of thorax very finely and 

 more si)arsely punctate. 1425. angustatus. 



(T. Fourth joint of anteiuia' but little, if any, longer than third. 



