schaeffer: donaciini of the new world. 63 
indentations strongly impressed; form rather short and 
robust aequalis Say. 
Prothora.x without transverse sub-apical impression; tu- 
bercles indistinct and more feebly separated from the disk; 
elytral indentations generally feeble, the posterior ones 
occasionally absent; form variable 23. 
23. Elytra without coarser transverse rugae; intervals finely, 
transversely strigate-rugose; hind femora generally feebly 
clavate, at base as wide or slightly narrower than at apex; 
form relatively narrow and elongate 24. 
Elytra with more or less distinct transverse coarser rugae, 
which are absent in rtigosa; intervals relatively coarsely 
rugose; hind femora strongly or moderately strongly 
clavate and distinctly' narrower at base than at apex, but 
feebly so in liebecki; form stouter 25. 
24. Body below densely pubescent, hiding almost entireh^ the 
metallic surface color; prothorax often with dual punctu- 
ation, small punctures intermixed with the generally dense, 
coarse punctures; anterior angles in the larger specimens 
frequently laterallj^ produced porosicollis Lac. 
Body below sparsely pubescent, pubescence very short and 
frequently scarcely visible at middle of first ventral segment; 
punctuation of prothorax variable; anterior angles never 
produced biimpressa Melsh. 
25. Antennae slender; third joint distinctly longer than second 
and as long as the first joint; outer joints elongate; head 
relatively feebly constricted behind the eyes, which are 
moderatelj' prominent; intercoxal process of mesosternum 
about one half the width of the cavities riigosa Lee. 
Antennae short, rather stout; second and third joints equal 
or sub-equal, third shorter than first joint; outer joints 
short; head rather strongly narrowed behind the ej-es, which 
appear thus very prominent; intercoxal process of meso- 
sternum about one fourth the width of the cavities 26. 
26. Antennae unicolorous, reddish; posterior femora armed 
below with a large, triangular tooth which is crenate 
posteriorly; form short and robust megacornis Blatch. 
Antennae bicolored; posterior femora below with a small 
tooth which is not crenate posteriorly; form short, but 
elytra more parallel and depressed liebecki Schffr. 
27. Serial punctures of elytra rather large; intervals narrow, 
never wider than the punctures; color bright metallic blue 
or purple with lateral margins of prothorax metallic green or 
golden magnifica Lee. 
Serial punctures of elytra moderate; intervals wider than 
the punctures; color variable but never bright metallic 
blue 28. 
28. Form rather broad, more like proximo; head distinctly 
