86 BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
sometimes the joints are narrowly reddish at base, but apparently never 
broadly annulated as in cincticornis, and in color it does not vary to such 
an extent as the latter species does, at least I have not seen any specimens 
with rufo-testaceous or entirely rufous elytra. From all reliable records 
this species occurs never in ponds where only the white water lilies grow, 
while cincticornis is apparently never found in ponds where the white 
water lily is absent. 
The following variety occurs: 
var. CALiFORNiCA Lee. 
Like typical proxima in size and all its characters, except that the 
head, prothorax and elytra are distinctly metallic green or cupreous and 
the serial punctures of elytra are coarser. 
British Columbia: Frazer (Weidt); Thurston Bay, June (Hopping). 
Washington: Quilcene, August (Shannon). 
California: "Cal. " (Leconte) ; Cisco, June (Von Geldern ex Van Dyke). 
Idaho: Coeur d'Alene (Hubbard and Schwarz). 
This apparently is strictly a western race. 
DoNACiA CAERULEA OHvicr. 
Form and color of proxima but smaller; antennae entirely black or 
joints narrowly reddish at base; femora and tibiae metallic, at base 
reddish. 
Head feebly constricted behind the eyes, which are large and 
prominent; median line deeply impressed; posterior tubercles feeble 
or absent; surface finely and densely punctate anteriorly, posteriorly 
less densely punctate; antennae reaching to about middle of elytra, 
third joint slightly longer than second and as long or nearly as long as 
the first joint, fourth joint nearly as long as the second and third together. 
Prothorax transverse, wider at apex than long; sides converging 
behind; anterior angles distinct, often obtuse but apparently never 
prominent; posterior angles generally prominent; lateral tubercles 
generally obliterated; median line finely impressed, occasionally in- 
distinct; anterior transverse impression more or less distinct; posterior 
transverse impression broad and shallow^ often indistinct; surface 
alutaceous, dull, often with fine scratches on the disk, laterally more or 
less distinctly, finely rugose. 
Elytra shining, truncate at apex; outer apical angle not distinct, 
broadly rounded; ante-median impressions feeble, post-median generally 
absent; serial punctures moderate, gradually smaller towards apex; 
intervals usually smooth and shining on the disk, laterally and at apex 
rugose. 
