March, 1896.] WlCKHAM, COLEOPTERA OF N. E. AMERICA. 
45 
margin. 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 —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 with ocel- 
late punctures. Length 16-20 mm. = .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, striae deep, intervals convex. Length 
18-25 mm * = .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 mm * = 
.80-1.00 in. 
Habitat'. New York, Massachusetts, Pennsylvania, Indiana, 
Louisiana, Florida, Missouri, Illinois, Iowa. 
