schaeffer: donaciini of the new world. 97 
This is a very distinct species and entirely different from palmata 
with which it has been placed as a synonym. The species which I 
described as glabrata is the same as assimilis. 
It is very similar to rugosa but is a little more slender insect with 
smooth elytra, generally with a distinct, longitudinal thoracic impression 
which is somewhat broad and shallow. The hind femora of both sexes 
are unarmed. 
DoNACiA BiiMPRESSA Mclsheimcr. 
Elongate, sub-convex; color variable, blue, bluish-green, purple, 
black or cupreous; antennae black, joints at apex more or less reddish* 
rarely entirely black or except the metallic first joint entirely reddish; 
legs sometimes entirely metallic, usually the femora towards base, tibiae 
and tarsi more or less reddish. 
Head feebly constricted behind the eyes, which are small and 
moderately prominent; median line fine; posterior tubercles more or 
less distinct; surface anteriorly generally punctate-rugose, posteriorly 
the punctures are usually more distinct and the intervals betw^een the 
punctures finely rugose; antennae reaching to the middle of elytra or 
nearly so, third joint variable, equal or sub-equal to the second and a 
little shorter than the first, or slightly longer than the second and equal 
to the first. 
Prothorax very variable in form and sculpture; about as wide or 
wider at apex than long; lateral tubercles more or less distinct, sides 
below these either distinctly converging to base or not and often more or 
less distinctly sinuate; anterior angles generally distinct, slightly pro- 
jecting, but never acute, occasionally oblique or rounded; posterior 
angles prominent, median line fine; surface finely and sparsely punctate 
with fine transverse and oblique lines between the punctures to coarsely, 
densely and in some part confluently punctate. 
Elytra moderately convex, feebly depressed above; impressions 
feeble; trunctate or subtruncate at apex; strial punctures moderatel}^ 
large, slightly smaller towards apex; intervals finely transversely rugose 
from base to apex, denser and scarcely finer at apex, near the scutellum 
frequently finely punctate. 
Body below very sparsely pubescent with rather short hairs which 
are almost invisible at middle of first ventral segment, punctuation not 
dense, punctures moderate, varying to more distinctly pubescent and 
punctures much finer and very densely placed, especially on first ventral 
segment; intercoxal process of mesosternum narrow; posterior femora 
generally short, extending to the apex of second ventral segment, occa- 
