44 Journal New York Entomological Society. [Voi. iv. 
D. laticollis Lee. —Black, somewhat shining, thorax transverse, 
sides slightly rounded and feebly sinuate towards the base, hind angles 
distinct. Elytra moderately deeply rather finely striate, the striae with 
fine punctures, seventh feeble. Length 13-20 mm. = .52-.80 in. 
Habitat: New York, New Jersey, Pennsylvania, Indiana, Illi¬ 
nois, Iowa, Canada, Nebraska, Kansas, Michigan, Florida. 
D. impressicollis Dej. —Usually black, sometimes the alternate 
elytral interstices are reddish. The thorax differs from that of laticollis 
as stated in the table ; and the seventh elytral stria, while sometimes 
slightly fainter than the sixth, is still distinct. Length 16-17 mm. — 
.64-.68 in. 
Habitat'. New York, Canada, Michigan, Indiana, Iowa, Illinois, 
South Dakota, Utah, Washington, Oregon. 
D. obtusa Lee. —Black, smaller than the other species and with 
the outer striae of the elytra very weak, the sixth being often quite fee¬ 
ble, while the seventh may be almost obliterated. The thorax has 
rounded hind angles and very deep well-defined basal foveae. Length 
11-12 mm. = .44-.48 in. 
Habitat: Illinois, Indiana, Iowa, Kansas, Nebraska, Nevada. 
Dicselus Bon. 
Usually large species of black, purplish or metallic color, the 
thorax broad, the elytra usually deeply striate, the seventh interval 
carinate from the humerus to a varying distance. With the exception of 
leevipennis , which extends into western Arizona, they are confined to 
the region east of the Rocky Mountains and to Mexico, being more 
numerous in the Atlantic States, especially those to the south. 
Synopsis of * Species. 
Elytral intervals very irregular, broken up by deep rugosities or by ocellate punc¬ 
tures. sculptilis. 
Elytral intervals regular, or at least entire. 
Thorax broad at base, narrowed at apex. 
Elytra brilliant, brassy or cupreous... splendidus. 
Elytra violaceous or purplish. purpuratus. 
Elytra black. 
Elytral intervals feebly alternating, humeral carina moderately long. .furvUS. 
Elytral intervals equal. 
Striae very distinctly punctured. crenatus. 
Striae not or very finely punctured. 
Smaller species (15-18 mm.). 
Form shorter, thorax with one segiterous puncture near middle of 
