NORTH AMERICAN COLEOl'TKKA. 243 



The male has a (sliglit iaij)iv.ssi()ii at the apex of the hist ventral 

 ami the first joint of anterior and middle tarsi dilated. 



The specimens taken in our fanna are of the color described above, 

 bnt varieties occur in Euro[)e bluish or green. It is usually found 

 on aquatic plants in the manner of Donacia. 



Occurs in Canada, at Detroit, also in Oi-egon. 



€/. atriventris Mels. — Form rather broadly oval and convex, rufotestace- 

 ous, without luetallic lustre. Antennse, half as long as the body, pale rufotesta- 

 ceous, very slightly thicker externally. Thorax twice as wide as long, sides 

 posterioi'ly feebly arcuate, anteriorly obliquely truncate, a slight angulation one- 

 third from apex, disc convex, impunctate, ante-basal transverse impression mod- 

 erately deep, rectangularly bent at each end to the base. Elylra wider at base 

 than the thorax, humeri rounded, umbone scarcely prominent, disc convex, 

 scutellar .stria long, nine discal strife all with coarse, moderately closely placed 

 punctures, which become rapidly finer to apex, ninth not distant from the mar- 

 gin, intervals a little broader than the striie, slisihtly convex and smooth. Pros- 

 terniiin indistinctly coarse punctate, pleurpe smooth. Metasternum and abdomen 

 piceous, the latter sparsely, indistinctly punctate. Legs pale rufotestaceous. 

 Length .06 — .07 inch. ; 1.5 — 1.7.^ mm. 



The specimens before me are all females. The male characters 

 are probably as in Modeeri. 



This is the smallest species in our fauna. It is known by its rather 

 broadly oval and convex form and the very oblique truncation near 

 the front angles. 



Occurs from Massachusetts to Maryland. 



C. iiitens n. sp. — Ovate, robust, black, shining. Anteniife jiale rufotesta- 

 ceous; front smooth. Thorax rather more than twice as wide as lonsf, distinctly 

 narrowed in front, sides slightly arcuate, obliquely truncate at the front angles, 

 disc convex, the punctures rather coarse and deep, but not crowded, intervals 

 smooth, ante-basal impression feeble, but slightly arcuate toward the base. 

 Elytra scarcely wider at base than the thorax, humeri rounded, umboue rather 

 feeble, disc convex, with a vague transverse depression one-third from base and 

 along the suture, giving the aspect of a feeble giblwsity on each elytron, strife 

 not impressed, the punctures relatively small, not closely placed, intervals flat, 

 much wider than the strife, smooth and shining. Prosternum and pleurse coarsely 

 punctate, .\bdomen sparsely punctate. Femora piceous black, tiiiife brown, 

 tarsi paler. Length .08 inch. : 2 mm. 



This species has been found rather troublesome to })lace generi- 

 cally. The form and facias suggest Epitrix, but there is no pubes- 

 cence, nor are there any fine punctures in the intervals to suggest 

 their probable presence ; the metasternum in front is rather broad, 

 as in Modeeri, and suggests a relationship with that species, although 

 quite different in form and appearance. With a predilection for 



