schaeffer: donaciini of the new world. 75 
nent; posterior angles prominent; lateral tubercle indistinct or absent; 
anterior impression absent; median impression generally distinct and 
fine, not extending quite to apical margin; basal impression generally 
distinct; surface more or less shining in the male, generally dull in the 
female, disk with a few fine punctures and occasionally with a very fine 
rugosity along the median line, at base and laterally. 
Elytra truncate at apex, outer angle more or less rounded; surface 
generally shining in the male and dull in the female; strial punctures 
variable, often coarse and as wide or wider than the intervals or the 
punctures smaller than the intervals; intervals occasionally more or 
less convex, generally very finely punctate and not rugose except at apex. 
Body beneath very densely and very finely punctate and pubescent 
with short, white silken hairs; side pieces of prosternum nearly entirely 
pubescent; mesosternal process between middle coxae as wide or nearly 
as wide as the coxal cavities; legs normal. Length: 4.25-6 mm. 
Male : Last ventral segment truncate and very distinctly impressed 
at middle of apex ; last dorsal broadly rounded at apex ; posterior femora 
incrassate in about apical three fourth, extending to the apex of elytra, 
armed below with a small acute tooth. 
Female: Last ventral segment at apex more or less distinctly 
emarginate at middle, occasionally truncate; last dorsal elongate, sub- 
triangular, rather broadly rounded at apex; posterior femora extending 
to the apex of the fourth ventral segment less strongly incrassate than 
in the male and in about apical half, armed below with a small tooth. 
Massachusetts: Westfield, August (Knab); Lowell (Blanchard) ; 
Framingham, June (Frost); Bedford, September (Frost). 
New York: Wyandanch, Long Island, August, September (Schott, 
Schaeffer); Silver Lake, Staten Island (Schaeffer) ; Peekskill 
(Sherman) . 
New Jersey: Lakehurst, September (Woodruff, Davis, Engelhardt) ; 
Clementon, August (Boerner) ; Hammonton, July (Wenzel) ; Bay- 
head (Nicolay) ; Budd's Lake, September (Bischoff) ; New Lisbon, 
July (Liebeck). 
Pennsylvania: Bristol, September (Wenzel). 
South Carolina: Swansea, August (Knab). 
This species is generally found on the flowers and leaves of the white 
water lily, Castalia odorata. At Bristol, Pa., Mr. Wenzel found this 
species in numbers on Castalia and also on Brasenia. 
This species and militaris are the smallest of our Donacias. The 
males of both can not be confused with each other principally on account 
