schaeffer: donaciini of the; new world. 93 
Body below rather densely pubescent; intercoxal process moder- 
ately wide ; posterior femora in both sexes moderately elongate, extending 
to about the apex of fourth ventral segment, distinctly but not strongly 
incrassate, narrower at base than at apex and armed below with a small 
tooth. Length: 6-9 mm. 
Male: Last ventral segment with a distinct impression at middle of 
apex; last dorsal truncate at apex. 
Female: Larger and more robust than the male; last ventral segment 
sub-triangular; last dorsal truncate or sub-truncate. 
Hudson Bay Territory: "Huds. B. Terr." (Leconte coll.). 
Ontario: "Ont." (Entom. Branch, Ottawa). 
Iowa: Clear Lake, July (Shimek). 
Missouri: Creve Coeur Lake (Bock in coll. Knab). 
Minnesota : Lake Itasca (Graham) ; Ely, September (Kubichek) ; Swan 
Lake, July (Mabbot); Rush Lake, August (Kubichek, Metcalf). 
Michigan: Douglas Lake, Cheboygan Co. (Hatch); Calhoun Co., 
August (Emmons); Carp Lake (N. Y. S. M.); Detroit (Hubbard 
and Schwarz). 
Wisconsin: Tenderfoot Lake, Vilas Co., June (Marshall). 
Illinois: "Illinois" (Knab). 
Indiana: Lake Co. (Knab). 
New York: Spencer Lake, August (Dietrich) ; Rochester (Wendt) ; Platts- 
burg. 
Reported to occur on bulrushes (Knab). 
D. quadricollis Say is not a synonym of suhiilis, the "feet dull 
rufous ... all the thighs a little dusky above" never occurs in this 
common species, which has the posterior femora uniformly metalHc. 
The coloration of the legs as well as the rest of Say's description agrees 
very well with the more recently described D. curticolUs Knab, but with 
no other North American Donacia. In regard to the coloration of the 
legs and sculpture of prothorax, etc., D. rugosa would answer Say's 
description but in that species the second antennal joint is decidedly 
shorter than the third and never "but little shorter than the third." 
This apparently also is D. cupraea Kirby, which latter is not what 
Dr. Leconte identified as that species. In one of his letters Mr. Arrow 
called my attention to our wrong identification of Kirby's species stating 
that it is not a Plateumaris but a true Donacia and from his notes on 
the type it seems to be the same as Say's quadricollis. When I returned 
the British Museum material Mr. Bryant, to whom my inquiries were 
