BY THOMAS G. SLOANE. 55 



Mentum short, deeply emarginate ; lobes broadly rounded in 

 front ; median tooth strong, bifid at apex. 



Palpi : labial thick, penultimate joint bisetose, last joint 

 elongate, longer than penultimate, cylindrical, truncate ; maxillary 

 with penultimate joint short, conical, last elongate, thick, truncate. 



Antennce short, moniliform, 1st and 3rd joints about equal in 

 length, 1st thick, cylindrical, 3rd with apical half globose, then 

 suddenly constricted, the basal half narrow, cylindrical, 2nd joint 

 short, conical. 



Prothorax short, the angles rounded ; one marginal puncture on 

 each side, about middle. 



Elytra short, broad. 



Legs : $. Anterior femora short, thick, without a dentiform 

 projection below ; anterior tibiae short, strongly excavate below, 

 outer edge finely serrate near apex ; anterior tarsi short, the 

 joints short, broad, a little obliquely produced externally, without 

 any spongiose tissue below. 



Percolestus blackburni, n.sp. 



Form short, robust. Black, shining ; undersurface more 

 polished ; palpi piceous. Head short, broad, convex, smooth, not 

 constricted behind eyes, lightly and broadly impressed on each 

 side behind the eyes, the impressions becoming obsolete on vertex; 

 a light impression on each side of the clypeus, hardly reaching 

 behind clypeal suture ; clypeus subtruncate ; eyes globular, 

 prominent, not inclosed in prominences behind ; prothorax sub- 

 convex, subquadrate (4^x5 mm.), a little narrower behind 

 than in front, truncate in front and behind ; sides shortly 

 rounded to anterior angles, — these not advanced, — more gently 

 rounded to basal angles, — these not marked, — lateral border 

 narrow, reaching the base ; median line very fine, not reaching 

 either margin ; a single marginal puncture on each side, placed a 

 little behind the middle. Elytra convex, shortly oval (9x6 mm.), 

 lightly striate; striae very fine, those near the suture more distinct; 



