schaepfer: donaciini of the new world. 127 
This is what has been wrongly identified as ruja Say, but the latter is, 
as shown previously, the same as tuberculata Lac. 
D. sulcicollis is a rather short, robust insect with shining and feebly 
punctate pro thorax ;, generally with rather large but feebly distinct lateral 
tubercles, which are smooth and shining; the legs are relatively short 
with strongly incrassate posterior femora, which are nearly elliptical 
in shape, at base and at apex of about equal width, the second joints of 
hind tarsi wider than long and the color of legs and antennae always 
rufous. 
The anterior part of the lower vaginal plate of the females, shaped 
like an arrowhead, is peculiar to this species and diver sa. 
DoNACiA FLAViPES Kirby. 
Plate V, fig. 5. 
Elongate; color generally reddish-cupreous, occasionally aeneous, 
metallic green or purple; legs and antennae usually entirely rufous but 
sometimes antennae annulate and femora bicolored; below entirely 
metallic or the last ventral more or less reddish. 
Head strongly constricted a little below the eyes, which are promi- 
nent; median line often deep and rather wide; surface shining, feebly 
pubescent, densely punctate with moderate punctures; antennae gener- 
ally short, extending scarcely to the middle of elytra in typical specimens, 
longer in the varieties described below, second and third joints usually 
small, subequal, fourth scarcely as long as the first joint, except in the 
varieties. 
Prothorax about as wide at apex as long; anterior angles distinct, 
not or more or less projecting; basal angles feebly prominent; lateral 
tubercle rather large, convex and generally punctate, separated from 
the disk by an arcuate, densely sculptured impression; median line 
deep and rather wide, except in one of the varieties ; anterior impression 
absent; posterior impression very distinct; sides feebly arcuate below 
the lateral tubercle and slightly narrower towards base; surface more or 
less shining, rather finely punctate, punctures frequently transversely 
confluent, forming a more or less dense, strigate-rugose sculpture. 
Elytra generally shining in the typical form, with the dorsal im- 
pressions faint, the post-median often absent; serial punctures moderate, 
scarcely finer towards apex; generally with a few coarse transverse 
rugae; intervals usually smooth, rarely with fine punctures. 
Body below rather closely but not densely punctate, punctures 
