Casey — A Revision of the American Paederini. 217 
slightly paler. Although pallens is represented by the female 
only, I have before me two specimens which are mutually 
perfectly similar and its pale color is doubtless a specific 
character. 
Scopaeodera Csy. 
Among the genera of Scopaei having the basal joint of the 
hind tarsi elongated—a peculiar and very interesting series, 
apparently most highly developed in the American conti- 
nents, — Scopaeodera is greatly isolated in habitus because of 
the highly polished, glabrous and subimpunctate integuments 
and presence of long stiff tactile setae. The species also 
differ from the others in their comparatively simple secondary 
male sexual characters and in having the middle pair of labral 
teeth alone developed, the exterior teeth being obsolete or 
extremely minute. They are almost exclusively tropical in 
range and in all probability numerous, but only two have 
been discovered thus far in our southwestern territories. A 
number of them were described by Dr. Sharp in the ‘* Biolo- 
gia’’ as Scopaeus, under group ‘‘4,’’ and the Colombian 
pulchellus Er. and Amazonian distans Shp., among others, 
also belong here. Our two species may be readily identified 
by the following characters: — __ 
Form rather slender, notably convex, polished throughout and pale flavo- 
testaceous in color, each elytron clouded with piceous- black behind the 
middle except at apex, the abdomen also largely blackish toward tip; 
erect tactile setae sparse, shorter on the elytra and in the single trans- 
verse discal series of the abdominal segments; elytra with long, coarse 
suberect and very sparse hairs in addition, the abdomen with very fine 
and moderately close-set pale pubescence; head rather small, longer 
than wide, the eyes large, convex and prominent, at a little less than 
twice their length from the base, the sides behind them converging and 
straight for a short distance, then very broadly rounded into the sub- 
truncate median parts of the base; antennae moderately thick, feebly 
incrassate, not as long as the head and prothorax, with the cylindric 
basal joint longer than the next two together; prothorax very slightly 
narrower than the head, longer than wide, widest and obtusely sub- 
angulate laterally at apical fourth, the sides thence gradually converging 
and broadly arcuate to the base and very rapidly converging and feebly 
sinuate to the narrow neck, the surface strongly convex, impunctate; 
elytra slightly elongate, parallel and broadly arcuate at the sides, nearly 
