'290 lU'T.TT.TTX (io. rXTTF.n STATES XATlOXATv MUSEUM. 



/:pipht/r<i quito wiilo at iho huinori. thoiu'o irnuhially and rathor 

 rapidly narnnviuir fen- a short distanoo, thon loss rapidly to apex, 

 whei'e thoy narrowly niariiin tho sides oi' the inferior surface of the 

 caiida : surface smooth, generally inipuni'tate. 



Sterna more or less punctate and rnuulose. 



ParapJeurtr not stroualy punciate. 



Ah(h^nicn horizontal, tinely. sp;irsely. quite evenly ]iunctate and 

 more or less niirulose. 



Lvfjfi^ rather loiiij und (]uite slemler; anieritn* femora armed with a 

 straight, acute tooth in both sexe^: tibial spui^s similar in the sexes 

 and rather small, the anterior beino; equal and acute. Tarsi similar 

 ill the sexes. 



i)fah\ — Elonjiate and dinun-}ihic. Pronotum nearly quadrate, about 

 a sixth to less than a third wider than lonir. Elytra iiradually de- 

 clivous posteriorly; apex briefly produced or strongly and horizon- 

 tally caudate, and accordinirly two forms may be recoirnized : 



Forma tj^ica with the cauda equal to about a fourth of the entire 

 leiiixth of the elytra. .Vbdominal segments one to three usually 

 broadly and lontritudinally impressed: posterior tibiiv quite strongly 

 arcuate in basal half, thence to apex straight and distinctly widened. 



Forma ecaudata with the elytral apex simply obliquely and briefly 

 produced, acute at tip. Abdomen evenly convex from side to side; 

 posterior tibia^ not arcuate and not nunv suddenly widened toward 

 apex. 



FeinaJ(. — Robust. Pronotum slightly transverse and about a 

 fourth to a third wider than long. Elytra more or less broadly oval 

 and slightly ventrici>se, quite strongly, suddenly ami obliquely decliv- 

 ous posteriorly; apex simply acute. Abdomen evenly convex. Pos- 

 terior tibia" straight. 



Ot liifaJ rhdracfii'S, male. — Edeago]ihore oblong-ovate, rather small 

 and slightly arched. 



Ba<<aJc evenly convex, oblong, w ith the sides subparallel, and about 

 twice as long as the apicaJe. 



Apkale longer than wide at base, triangular; surface evenly con- 

 vex, with a very tine median groove extending from near the base to 

 the apex, where it Ix'comes wider; sides nearly straight t)r feebly 

 arcuate; apex acute and not jn-odiiced ; base subacutely lobed at the 

 middle and sinuate laterally. 



Stern ifr truncately subtriangular. Each lobe Avith the external 

 border straight in basal two-thirds converging toward apex, thence 

 evenly arcuate to angle: internal margin rather arcuate, apex nar- 

 rowly rounded: surface rather strongly and densely punctate 

 throughout, setose, setfe quite long and dense at tip. Membrane not 

 setose across the bottom of the sinus, the latter rather broad. 



