schaeffer: donaciini of the new world. 149 
the antennal joints, also elongate, are generally slightly shorter and 
usually differently colored, the prothorax is wider and the form is more 
robust than in wallisi. D. longicollis described below is also a rather 
narrow insect, but has a longer prothorax which is much more narrowed 
behind, the strigate-rugose sculpture of the side pieces of prosternum 
coarser and lateral tubercles more distinct and convex; the lateral margin 
of elytra is generally evenly acute to a little below middle and the neck 
behind the eyes is wider which causes the eyes to appear less prominent. 
The aurtfer var. of Dr. Leconte's revision is a specimen of the above 
described species with two impressions on the prothorax which is acci- 
dental and occurs occasionally in many other species of both subgenera. 
Of this species I have seen about 70 specimens or more, the majority 
collected by Mr. Wallis, whose name I give this distinct species in 
recognition of favors received. 
The specimens reported as flavipes by Dr. Van Dyke in Nat. 
Geograph. Soc. Techn. pap. 1924, p. 24, are wallisi. 
DONACIA PUSILLA Say. 
Plate V, fig. 15. 
Moderately elongate to relatively robust; color of upper surface 
bronze, cupreous, metallic green, blue, purple or black; below metalHc; 
legs entirely rufous or femora in about apical half or less metallic; an- 
tennae annulate, broadly red at base and black at apex, rarely the outer 
joints black. 
Head slightly prolonged and more or less distinctly arcuately 
narrowed behind the eyes and distinctly constricted ; median line deeply 
impressed; surface densely punctate-rugose; antennae extending not 
quite to or distinctly to the middle of elytra in the males, shorter in the 
females, second and third joints very small, equal, third often a little 
longer than the second but generally shorter than the first, fourth joint 
usually smaller than the first, but frequently as long as the first joint, 
outer joints usually stouter than the inner joints. 
Prothorax more or less shining, very rarely feebly pubescent above 
with very short, scarcely visible hairs, about as wide at apex as long; 
anterior angles distinct, sometimes rounded, occasionally slightly promi- 
nent; posterior angles feeble or slightly projecting; lateral tubercles 
feebly separated from the disk, at sides slightly prominent; median 
line generally absent, rarely a specimen may have a more or less distinctly 
impressed median line; basal impression generally absent, occasionally 
