March, 1896.] WiCKHAM, CoLEOPTERA OF N. E. AMERICA. 45 



niargin ovalis. 



Form elongate, thorax with two setigerous punctures near middle of 

 margin elongatus. 



Larger species (20-25 mm.). 



Form elongate, sides of thorax reflexed posteriorly ambiguus. 



Form broad, sides of thorax not or but slightly reflexed posteriorly, 



elytral intervals rather narrow, convex dilatatus. 



Thorax narrowed at base, elytra feebly shining teter. 



Thorax about equally narrowed at base and apex, humeral carina short, elytra very 

 shining politus. 



Most of the above characters have already been used in the syn- 

 optic table of Diccelus published some time ago by Dr. Horn in the 

 Brooklyn Bulletin. The arrangement has been changed to suit the 

 different conditions consequent upon the more restricted fauna under 

 consideration. The setigerous punctures referred to under ovalis and 

 elongatus are actually anterior to the middle, but the above wording 

 has been adopted to keep students from misconstruing the punctures 

 meant. There is usually a sub-basal puncture to be seen and often a 

 sub-apical bristle as well. 



D. sculptilis ^y. — Black, shining, but without metallic luster. 

 Easily known from the other species of the genus by the peculiar rough- 

 ness of the elytra, the alternate intervals being curiously broken and 

 distorted. The bottoms of the striae are granulate or marked vvith ocel- 

 late punctures. Length 16-20 mm. r= .64-. 80 in. 



Habitat: Ohio, Pennsylvania, Wisconsin, Iowa, Illinois, South 

 Dakota, Kansas, District of Columbia, Maryland, Manitoba. 



D. splendidus Say. — Blackish with violaceous or purplish reflec- 

 tions, especially on margins of pronotum and on lower surface of body. 

 Upper surface of prothorax marked with fine wavy lines, mostly trans, 

 verse in direction, median longitudinal line very clear and sharp-cut. 

 Elytra coppery or brassy, shining, strige deep, intervals convex. Length 

 18-25 ^''™- = -76-1.00 in. 



Habitat : Nebraska, Kansas, Iowa, Illinois, Missouri, Louisiana. 



D. purpuratus Say. — Very closely resembling splendidus, but 

 differing in being of a purplish or violaceous color, without brassy 

 elytra, the antennae and legs black. The form is more elongate than in 

 splendidus, and the head larger in proportion. Length 20-25 rn™- = 

 .80-1.00 in. 



Habitat: New York, Massachusetts, Pennsylvania, Indiana, 

 Louisiana, Florida, Missouri, Illinois, Iowa. 



