Coleopterological Notices, VI. 707 



convergent from base to apex, the latter narrowly truncate, with 

 a small and very short truncate median projection, the surface 

 strongly and transversely convex throughout ; on the under sur- 

 face it is broadly and deeply excavated throughout its length, 

 the side walls projecting inward and prominent at basal fourth ; 

 in profile the entire organ is strongly and evenly arcuate down- 

 ward from base to apex. The fifth ventral is unmodified, broadly 

 rounded at apex, the genital segment rather small, flat, short and 

 trapezoidal. 



23. A. decrepitus n. sp. — Moderately stout, the elytra somewhat de- 

 pressed, polished, black, the entire under surface, legs and antennae rufo-testa- 

 ceous; pubescence moderate in length, somewhat dense, cinereous and con- 

 spicuous. Henil moderate in size, quadrate, strongly convex, finely, sparsely 

 punctate, arciiato-truncate and minutely, feebly impressed at base; angles 

 broadly rounded ; tempora long, pai'allel behind the eyes which are moderately 

 large and prominent ; anteuna; rather short, not quite as long as the head and 

 prothorax, someAvhat incrassate, the tenth joint as long as wide. Prothorax 

 small, much narrower than the head, fully as long as wide, convex, con- 

 stricted in an obtuse angle at basal fourth, the sides anteriorly broadly 

 rounded; disk widest near apical fourth, strongly but rather sparsely punc- 

 tate; basal margin short. Elytra nearly four-fifths longer than wide, distinctly 

 more than twice as wide as the iirothorax, broadly and obtusely rounded be- 

 hind, the sides parallel and feebly arcuate; subscutellar impression broad and 

 feelile; omoplates nearly obsolete ; punctures close, deep and moderately coarse; 

 finer and feebler toward apex. Abdomtn polished, coarsely reticulate in fine 

 lines, the punctures very feeble. Legs moderate in length, slender. Length 

 2.4 mm. ; width 0.75 mm. 



Oregon (The Dalles). Mr. Wickham. 



This species is remarkable, among its associates of the present 

 group, in the form and small size of the prothorax, the constric- 

 tion being at a greater distance from the base than usual ; it re- 

 sembles cephalotes, but differs greatly in its smaller head and pro- 

 thorax ; in decrepitus the basal width of the latter is almost 

 equal to its maximum width. The sex of the single specimen in 

 my cabinet has not been determined. 



24. A. Iliercurialis n. sp. — Somewhat slender, the elytra slightly flat- 

 tened, shining, dark piceous-brown or paler, the paler forms frequently with 

 a large nubilate and slightly paler spot on each elytron at ajfical foui'th, and 

 also paler near the base; antennaj throughout and legs rufo-testaceous, tlie 

 femora darker; pubescence stiff but short, rather abundant, pale yellowish- 

 cinereous and distinct. JfcKd subquadrate, wider than long, convex, truncate 

 at base and broadly, strongly impressed in the middle, the angles broadly 



AxxALS N. Y. Acad. Sci., VIII, Oct., 1895—48. 



