84 BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
This variety and its larvae were found on Potamogeton by Boving 
and Craighead. 
This is the same as D. pnlchella of Leconte and was given a name 
by him as well as by Lacordaire on account of the different thoracic 
sculpture from that of cincticornis. The sculpture of prothorax, how- 
ever, varies and is in some specimens only more or less distinctly visible 
at apex, base or sides, in others the entire thorax is strigate-rugose. The 
strial punctures of elytra are generally larger, intervals narrower and 
the apices of elytra more frequently emarginate than in typical cincticornis. 
The first three or four antennal joints are often black with scarcely a 
trace of the reddish color at base. Only a few specimens of the material 
examined have all the characters mentioned above, generally one or 
two are absent. 
DoNACiA PROXiMA Kirby. 
Less elongate and moderately depressed; color of upper surface 
black with more or less distinct blue; purple or greenish metallic tint; 
prothorax and elytra at sides more distinctly metallic, elytral punctures 
generally golden-green; antennae generally entirely black; legs usually 
metallic, femora at base and occasionally the tibiae more or less reddish, 
upper edge of femora usually purple. 
Head very feebly constricted behind the eyes, which are large and 
prominent; median line deeply impressed; posterior tubercles absent 
or feeble; surface anteriorly finely and densely punctate, posteriorly 
more coarsely and sparsely punctate; antennae reaching to about middle 
of elytra, second and third joints sub-equal, third a little longer than 
second but shorter than the first joint. 
Prothorax transverse, wider at apex than long; sides converging 
behind; anterior angles distinct, usually slightly prominent; posterior 
angles prominent; lateral tubercles feeble or moderately distinct; median 
line finely impressed; anterior transverse impression narrow but usually 
distinct; posterior transverse impression broad, shallow and often 
indistinct; surface shining, disk with a few small punctures, laterally 
and often in the sub-basal impression rugose. 
Elytra shining, truncate at apex; outer apical angle obliterated, 
broadly rounded; strial punctures moderately large, gradually smaller 
towards apex; intervals smooth and shining on the disk, laterally and 
at apex rugose; ante-median impressions usually feeble, post-median 
impressions generally absent. 
Body below very finely and densely punctate and very densely 
pubescent with very short, white hairs, the pubescence hiding the surface 
