6o BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
first joint; elytra rather coarsely and densely rugose, with- 
out any indentations; hind femora gradually clavate dissimilis n. sp. 
Third joint of antennae as long as second and shorter than 
the first joint; elytra generally smooth on the disk or 
faintly rugose, at sides more distinctly rugose; elytral in- 
dentations usually very distinct; hind femora more 
suddenly clavate aequalis Say. 
23. Elytra finely rugose 24. 
Elytra coarsely rugose 25. 
24. Ventral segments densely pubescent, especially the first, 
almost obscuring the metallic surface color porosicollis Lac. 
Ventral segments sparsely pubescent with rather short hairs, 
metallic surface color always plainly visible . hiimpressa Melsh. 
25. Second and third antennal joints short, equal in length, 
third shorter than first joint; head strongly narrowed 
behind the eyes which are very prominent 26. 
Third antennal joint at least one half longer than second and 
as long as the first joint; head feebly narrowed behind the 
eyes which are moderately prominent rugosa Lee. 
26 Antennae black or bicolored; posterior femora generally bi- 
colored and armed with a small, acute tooth liebecki Schff r. 
Antennae unicolorous, reddish; posterior femora generally 
uniformly reddish and armed with a large triangular tooth, 
which is more or less crenulate on its posterior margin .... megacornis Blatch. 
27. Prothorax finely alutaceous, dull, with a very few, fine 
punctures on the disk, laterally very finely rugose edentata Schffr. 
Prothorax shining and distinctly punctate 28. 
28. Prothorax densely punctate with moderate punctures and 
pubescent with rather short hairs ; elytra a little more than 
twice as long as wide at base, apices rounded pubicollis Suffr. 
Prothorax not pubescent; elytra less than twice as long as 
wide at base, apices more or less truncate 29. 
29. Third antennal joint as long as the first joint; posterior 
femora strongly clavate, at base distinctly narrower than at 
apex 30. 
Third antennal joint shorter than the first; posterior femora 
feebly clavate, as wide at base as at apex vicina Lac. 
30. Elytra smooth, not rugose on the disk, feebly rugose at sides 
and apex; prothorax with a rather wide but shallow 
longitudinal, median impression assimilis Lac. 
Elytra generally coarsely rugose; prothorax without or 
rarely with narrow median impression rugosa Lee. 
Key to females. 
1. Posterior femora armed below with one or more teeth or 
tubercles 11. 
Posterior femora unarmed below 2. 
2. Third joint of antennae as long or longer than first 5. 
Third joint shorter than first 3. 
