Il8 BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
Female: Posterior femora unarmed below; last dorsal segment 
truncate at apex; last ventral segment rounded at apex. 
Massachusetts: Springfield (Knab); Framingham, July (Frost). 
Connecticut: Berlin (Britton) ; New Haven (Butrick) ; Meriden (Zappe). 
New York: Maspeth, Long Island, August (Schott); Clove Valley, 
Staten Island, July (Davis, Leng); White Plains, July (Squire); 
Voorheesville, July (Leonard). 
New Jersey : Westville and Camden (Castle) ; Hammonton (Hubbard 
and Schwarz coll.); Malaga, June (Wenzel); Lakehurst, July 
(Davis); Newark (Bischoflf). 
Pennsylvania: Angora (Castle); Mt. Airy (Laurent), Baoba, Pike Co., 
July (Wenzel). 
Maryland: "Md." (Lugger). 
District of Columbia: Rock Creek, Washington, May, June (Nat. Mus.) ; 
Eastern Branch, June (Nicolay). 
The host plant of this species is Sagittaria (Leng, Schott and Wenzel). 
Donacia rufa Say is without doubt the same as D. tuberculata Lac. 
The species identified at present as rufa does not agree with Say's de- 
scription at all. "Body totally dull rufous, with metallic gloss, particu- 
larly on the elytra; head dusky, almost opaque, etc." does not apply to 
any specimen of the common insect known as rufa at present. There 
is also no mention of a femoral tooth in Say's description but as he noticed 
the femoral tooth in his other five species, even of pusilla, which has a 
small tooth, I am confident that Say's specimen had the hind femora 
unarmed. The rufa of Mr. Leng's revision has a large, triangular tooth 
on the hind femora and would not have been overlooked by Say, in fact, 
is described as a "broad prominent angle" in his metallica which is the 
same species as the one wrongly identified as rufa at present. The females 
of tuberculata have no femoral tooth and as the rest of Say's description 
of rufa agrees very well with certain rufous specimens of tuberctdata I 
am quite confident that my identification of Say's rufa is correct. More- 
over, the description does not fit any other North American Donacia. 
The head is feebly narrowed behind the eyes, the neck wide, eyes 
small, the usually very distinct ocular orbits are here generally obsolete, 
the prothorax with distinct lateral tubercles, surface dull or feebly 
shining with fine rugulose sculpture and scarcely any punctures, the 
male femora armed below with a small tooth and a denticle in front of 
the latter and the female femora unarmed will help in recognizing this 
peculiar species. 
