schaeffer: donaciini of the new world. 131 
narrow, arcuate impression; median line rather wide and more or less 
deeply impressed; anterior impression absent; posterior transverse im- 
pression very distinct; surface shining, sparsely and rather finely punc- 
tate; punctures denser along the median line and anteriorly and pos- 
teriorly more or less transversely and longitudinally confluent. 
Elytra with ante-median impressions feeble, post-median absent; 
strial punctures moderate, a little finer towards apex; surface shining with 
a few coarse, transverse rugae; intervals sparsely minutely punctate. 
Body below feebly and moderately closely punctate and sparsely 
pubescent with short, cinereous hairs; side pieces of prosternum coarsely 
strigate; posterior femora strongly incrassate, at base distinctly narrower 
than at apex, armed below with a large triangular acute tooth in both 
sexes. Length: 8-8.25 mm. 
Male: First ventral segment with a more or less distinct median 
impression; last ventral segment rather feebly impressed at middle of 
apex; last dorsal segment broadly but feebly emarginate at apex. 
Female: First ventral segment normal; last ventral segment 
broadly rounded at apex; last dorsal segment apparently feebly emargi- 
nate at apex. 
New York: Freeville, near Ithaca, June (Knab, Dietrich). 
This interesting species, of which I have seen five specimens, collected 
by the late Frederick Knab and H. Dietrich, is similar to typical flavipes. 
It is a little less robust than that species, but not as slender as emarginata 
or notmani. It differs from flavipes by the unicolored, bright metallic 
green and more sparsely punctate posterior femora. D. notmani, de- 
scribed below, has similar strigate sculpture of prothorax especially 
below, but the antennal joints are longer, the posterior femora are less 
strongly clavate and armed below with a moderate tooth, the head is 
less deeply constricted behind the eyes and the lateral tubercles of 
prothorax are smaller in notmani. 
Donacia nitida Germ, has never been recognized and I am not 
altogether certain that the few specimens from Freeville are correctly 
identified as that species; they all have the elytra tricolored. 
Germar records this species doubtfully from North America. How- 
ever, his description does not fit any of the palaearctic Plateumaris nor 
any other foreign species of which I was able to consult the descriptions. 
It is, therefore, probable that his specimens came from North America 
and as these Ithaca specimens agree better with Germar' s description 
than any other North American species I consider them nitida for the 
present till the types can be located and compared. 
