62 BROOKLYN MUSEUM SCIEXCE BULLETIN 3. 3. 
Posterior femora shorter, reaching the apex of the second 
ventral segment; prothorax alutaceous but more or less 
shining, frequently dull, generally sparsely and finely 
punctate, with a few larger punctures intermixed, median 
line entire from apex to base and deeply impressed parvidens SchfTr. 
15. Prothorax distinctly alutaceous, dull, with a few fine punctures 
on the disk 16. 
Prothorax not alutaceous, more or less shining and generally 
with coarse or moderately coarse punctures, except in 
aequalis, which has the punctures relatively fine, often dense 
and confluent 21. 
16. Middle tibiae dilated internally at apex and produced into a 
short tooth (plate V, figs, i and 2) 17. 
Middle tibiae normal, without tooth-like process 18. 
17. Last ventral segment produced at middle of apex into a 
short, lamina-like process, which is generally truncate and 
often feebly emarginate at tip; form broader and antennal 
joints generally stouter (plate V, fig. 10) piscatrix Lac. 
Last ventral segment regularly arcuately converging to apex; 
form slender and antennal joints narrower and more 
elongate (plate V, fig. 9) palmata Oliv. 
18. Elytra dull, alutaceous and generally blue; small species, 
about 8 mm. long rufescens Lac. 
Elytra shining, color variable; .larger species, 9-1 1 mm. 
long 19. 
19. Prothorax as wide at apex as long, generally narrower at apex 
than towards base; neck moderately wide and distinctlj' 
but not deeply constricted behind the eyes; eyes large and 
prominent.- hypoleuca Lac. 
Prothorax short, wider at apex than long and not narrower 
anteriorly 20. 
20. Posterior femora reaching the apex of the fourth ventral 
segment; first joint of all the tarsi elongate and generally 
longer than the third joint; neck robust texana Cr. 
Posterior femora reaching the apex of the third ventral 
segment; first joint of all the tarsi rather short, as long as 
the third joint; neck moderately robust caendea Oliv. 
21. Elevated lateral margin of elytra, separating the latter from 
the epipleurae, absent; epipleurae broadly, transversely 
rounded and wider than the last elytral interval; pro- 
thorax and elytra rather densely and moderately coarsely 
rugose quadricollis Say. 
Elevated lateral margin distinct; epipleurae narrower than 
the last elytral interval 22. 
22. Prothorax with distinct transverse sub-apical impression, 
which is limited behind on each side of median line by an 
oblique, obtuse ridge; lateral tubercles distinctly separated 
from the disk by a rather wide and deep impression; elytral 
