76 BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
of the different structure of the posterior femora and tibiae ; the females 
look superficially alike and also occur occasionally together on the same 
plant but the posterior femora are stouter in this species and are armed 
with a distinct tooth; the antennae also are stouter than those of the 
females of militaris. 
The emargination of the last ventral segment of the females is a 
rare character and the only other species in which this occurs is hypoleuca. 
This emargination is, however, variable, in some it is a rather deep sub- 
triangular incisure, in others it is faint or entirely absent. 
DoNACiA EDENTATA Schacffcr. 
Elongate, depressed; head and prothorax metallic; elytra castaneous 
without or with feeble metallic tint; antennae more or less blackish; 
legs brownish, femora more or less black above; underside brownish. 
Head densely punctate, punctures moderate; not constricted behind 
the eyes which are moderately large ; median impression deep; antennae 
narrow, elongate, reaching to middle of elytra or bej'ond, third joint as 
long or slightly longer than first. 
Prothorax about one fourth wider at apex than long; apical angles 
obtuse; basal angles more or less prominent; sides feebly sinuate; 
sub-apical impression absent; median impression generally deep and 
entire from base to nearly to apex; sub-basal impression sometimes 
distinct opposite the scutellum and sometimes absent; lateral tubercle 
very faint or absent; surface rather dull, alutaceous, sparsely punctate 
and generally very finely rugose laterally. 
Elytra truncate at apex, outer angles rounded; strial punctures 
moderately large and smaller towards apex; intervals more or less convex, 
smooth with scarcely any visible punctures, not rugose. 
Body beneath very finely densely punctuate and very densely 
pubescent; mesosternal process between the middle coxae about half 
as wide as the coxal cavities; pubescent space of prosternal side pieces 
large. Length: 5.25-7.25 mm. 
Male: Last ventral segment feebly depressed at middle of apex; 
last dorsal truncate at apex; posterior femora elongate, not quite reaching 
to apex of elytra, rather feebly incrassate and without tooth below. 
Female: Last ventral and last dorsal segments sub-triangular, 
truncate at apex; posterior femora as in the male but slightly shorter. 
New York: Crum Lake, June (Davis); Montauk Beach, Long Island 
(Schott). 
