schaeffer: donaciini of the new world. 117 
DoNACiA RUFA Say. 
Oblong and rather short and moderately depressed; color entirely 
reddish above and below with or without metallic tint to aeneous or 
cupreous above and partly below, sometimes the entire underside metallic 
with only the last ventral segment reddish; legs reddish, femora often 
more or less metallic near apex; antennae reddish varying to almost 
entirely black with faint metallic tint. 
Head rather feebly narrowed and constricted behind the eyes, which 
are small and feebly prominent; median impressed line fine; posterior 
tubercles faint or absent; ocular orbits occasionally faint and indistinct; 
surface moderately finely but densely punctate; antennae reaching far 
beyond the middle of the elytra in the male, to about middle in the 
female, third joint longer than second and about as long or slightly 
longer than the first, fourth joint much longer than the first. 
Prothorax about one half wider at apex than long; sides distinctly 
converging towards base, occasionally strongly sinuate; anterior angles 
distinct, thickened, occasionally prominent; posterior angles distinct 
and generally feebly prominent; lateral tubercle distinct and rather 
prominent, separated from the disk by a more or less deep, arcuate im- 
pression; anterior impression more or less distinct, limited behind on 
each side of median line by an oblique, rather faint, obtuse ridge ; posterior 
impression faint or absent; median line fine, extending from apex to 
base; surface generally dull or feebly shining, very finely rugulose with 
a few shallow punctures scattered over the disk. 
Elytra shining; apices truncate, outer angle rounded; serial punc- 
tures moderate and smaller towards apex; intervals generally finely 
rugose anteriorly, posteriorly towards apex more coarsely rugose, larger 
rugae extending from interval to interval but rather sparse ; ante-median 
and post-median impressions feeble, the former often more distinct. 
Body below densely and finely punctate, pubescence yellowish- 
cinereous and not very dense; pubescent space near anterior coxae 
small; intercoxal process of the mesosternum less than half as wide as 
the cavities; posterior femora rather strongly clavate, much narrower 
at base than at apex, extending to or nearly to the apex of elytra in the 
male, shorter in the female; armature below different in the two sexes. 
Length: 5.5-7 mm. 
Male: Posterior femora below with a small posterior tooth and 
more internally a small denticle anteriorly, which is often very indistinct 
and not visible from the outside; last dorsal segment truncate or very 
feebly emarginate at apex; last ventral segment slightly depressed at 
middle of apex. 
