44 Journal New York Extomological 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. =r: .5 2-. 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 ™™- = 

 .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 foveas. 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 

 Icevipennis, 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. 



Strice very distinctly punctured cretiattis. 



Striae not or very finely punctured. 

 Smaller species (15-18 mm.). 



Form shorter, thorax with one segiterous puncture near middle of 



