38 Natural History Bulletin. 



frontal tubercle; the vertex has in the middle, one-third of the 

 length from the apex, a conspicuous circular tubercle; clypeus 

 conical, this shape being brought about by the dilated anten- 

 nal fovege, leaving a narrow septum in connection with the 

 overhanging frontal margin, (?.) This septum in the $ is not 

 contiguous with the apex of the frontal margin. Antenna' as 

 in parvuhim ; the last palpal joint is more securiform and long- 

 er than in parvulum. Prothorax not wider than the head, 

 length and width equal, the base less than one half wider than 

 the neck; disk widest just before the middle, sinuate behind 

 the small lateral fovese; transverse sulcus nearl}^ straight, the 

 median angulation small. Elytra more convex from side to 

 side than in -parvtdnm; the sculpture is the same. Abdomen 

 without visible basal carinee, rather long, and produced behind 

 in the $; the basal segment is not more than visibly longer 

 than the second, the second ventral considerably shorter than 

 the first. Legs long, rather slender. 

 Habitat. Southern States. 



T. AMERiCANUM, Lec. Deep yellow, very convex, impunc- 

 tate; pubescence not perceptible. Length 0.6 mm. 



Head narrower than the prothorax, tempora prominent, 

 rounded, frontal margin arcuate, giving a triangular appear- 

 ance to the head; corners rounded; occiput impressed; foveee 

 and circumambient sulcus deep. AntenncB, excluding the last 

 joint, as long as the head; last joint of the palpi acuminate. 

 Prothorax wider just before the middle, wider than long, 

 evenly rounded from the neck to the transverse sulcus, lateral 

 foveae very small. Elytra convex, sides strongly arcuate, 

 widest behind the middle, rather long, and rounded at the pos- 

 terior lateral angle. Abdomen not visibly carinate at the base, 

 the first dorsal segment longer than the second. Legs rather 

 short. 



Habitat. Southern States. 



T. SIMPLEX, Lec. Darker, yellowish brown, prothorax red- 

 brown, pubescence extremely fine and short. Form like that 



