92 BROOKLYN MUSEUM SCIENCE) BULLETIN 3. 3. 
South Dakota: Brookings (Wickham). 
Minnesota: Lake Itasca, June (Graham, Minn. Univ.). 
Wisconsin: Tenderfoot Lake, Vilas Co., July (Marshall). 
Michigan: Port Huron, June (Hubbard and Schwarz) ; Detroit, June 
(Hubbard and Schwarz); Douglas Lake, Cheboygan Co., June and 
August (Hatch); Carp Lake, July (N. Y. State Museum). 
Illinois: Chicago, June (Knab coll.). 
Indiana: Pine, May (Wolcott) ; Clarke, July (Wolcott) ; Miller, June 
and July (Liljeblad). 
New York: "N. Y." (Leconte coll.). 
Texas: Devil's River (Leng coll.). 
Occurs on pickerel weed (Blatchley). 
This is the only North American species which has the elytra 
pubescent and is on this account readily recognizable. The pubescence 
is occasionally cinereous. The ridge which generally separates the 
epipleurae from the elytra is absent in this species. 
In the list of species in Genera Insectorum, family Donacidae by 
Clavareau and Jacoby, puhescens is wrongly placed in Plateumaris . 
DoNACiA QUADRicoLLis Say. 
Moderately elongate, feebly depressed; color of upper surface 
variable, from entirely ferruginous-yellow to entirely cupreous, metallic 
green or golden-green; legs pale, femora more or less metallic towards 
apex; antennae pale or entirely black, last joint or the last two or three 
paler; below entirely pale or metallic with the last ventral segment and 
occasionally one or two of the preceeding segments at middle reddish. 
Head rather feebly constricted behind the eyes, which are moderately 
large and moderately prominent; median line deeply impressed; anterior 
tubercles feeble ; surface densely and finely punctate ; antennae reaching 
to about middle of elytra, third joint distinctly longer than second but 
scarcely as long as the first joint. 
Prothorax short, about twice as wide at apex as long; sides con- 
verging from apex to base; lateral tubercles and median impressed line 
absent or feeble; surface densely rugose; anterior angles more or less 
rounded, posterior angles moderately prominent. 
Elytra truncate or arcuately truncate at apex, outer angle usually 
rounded, sutural angle occasionally with a small tooth; strial punctures 
coarse, towards apex a little finer; intervals more or less rugose; lateral 
marginal ridge absent; epipleurae transversely convex and wider than 
the last elytral interval; ante-median impressions more or less distinct, 
post-median impressions faint or absent. 
