I04 BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
Michigan: Lake Superior (Leconte) ; White Fish Point (Hubbard and 
Schwarz); First Sister Lake, Washtenaw Co., May (Hubbell). 
Wisconsin: Bayfield Co., June (Marshall). 
Maine: Monmouth and Wales, June (Frost). 
Massachusetts: Tyngsboro (Blanchard). 
The distincta of Mr. Leng's revision is not this species but the 
cupreous form {aiirichalcea Melsh.) of hiimpressa Melsh. of which torosa 
Lee. is a synonym. 
The bright metallic green specimens are from Hudson's Bay and 
are in the collection of the British Museum. 
This species can only be compared with siibtilis but distincta is a 
broader insect, with wider prothorax which has always a distinct median 
line and lateral tubercles; the head is more strongly narrowed and 
constricted behind the eyes, which are smaller and more prominent; 
the elytral sculpture is generally also finer and more equal from base to 
apex; the last dorsal segment of both sexes is emarginate at middle of 
apex and the antennae are a little stouter. 
In Genera Insectorum, family Donacidae, distincta is wrongly listed 
under Plateiimaris. It is a true Donacia resembling the Siberian ohscura 
splendida Jacobson closely but the latter has the pubescence below golden- 
yellow and the last dorsal segment of the female is entire, in the males 
scarcely emarginate, and the elytral sculpture is a little coarser. 
Donacia subtilis Kunze. 
Elongate, depressed; color aeneous, cupreous or obscure metallic 
green; antennae and legs entirely metallic or antennae, tibiae and tarsi 
more or less reddish at base. 
Head not deeply narrowed and constricted behind the eyes, which 
are large and prominent; median line distinct; posterior tubercles 
more or less distinct; surface closely punctate, very densely and more 
finely anteriorly; antennae extending to the middle of elytra or slightly 
shorter, third joint a little longer than second and both as long as the 
fourth joint, or very nearly so. 
Prothorax about one and one half times as wide at apex as long, 
sides generally distinctly converging towards base; anterior and basal 
angles distinct but not prominent; lateral tubercle very feeble or absent; 
median impressed line generally absent but occasionally present; sculp- 
ture variable from sparsely to densely punctate, punctures moderately 
large, laterally generally coarsely strigate. 
Elytra depressed; apex truncate, outer angle generally distinct 
