My collections in this extensive family contain over ninety species, of which several are yet undetermined. The great similarity of the species in some genera and the variation in form and color of individuals in other groups render their determination difficult.

Donacia pubescens Lec. This species is readily distinguished by the dense pubesence of thc upper surface, which in our other species is of metallic lustre. It was described from a specimen taken by Dr. Le Conte at Smoky Hill river, while on the W. Pac. Ry. survey between kansas and New Mexico in 1867, (Trans. Am. Ent. Soc. Vol. 11, pg. 55.) It has since been recorded from Michigan and Buffalo. Four or tive specimens taken by Mr. Fletcher in a small swamp near the city, in 1878.