Casey — A Revision of the American Paederini. 217 



slightly paler. Although pattens 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 additton, 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 



