SMICRONYX. 131 
4. Smicronyx thoracatus, sp. n. 
Oblong-ovate, black, the outer half or more of the elytra, and the femora and tibie, usually rufescent ; 
the surface thickly clothed with uniformly coloured, pale greyish, oval, moderately coarse, imbricate 
scales, the elytral interstices each with a row of curled, decumbent sete. Rostrum moderately stout, 
feebly constricted at the base, about as long as the prothorax, rugulose to near the tip, the antenne 
inserted a little before the middle; eyes contiguous beneath. Prothorax convex, about as long as broad, 
rounded at the sides, narrowed and constricted in front, and slightly narrowed behind ; the surface 
closely, somewhat coarsely punctate, the disc with a smooth median line. Elytra one-half wider than 
the prothorax, subparallel towards the base, with fine, sharply-cut striw, the outer strie distinctly punc- 
tured, the interstices flat and punctulate. 
Length 23-24 millim. (¢.) 
Hab. Mexico, Guanajuato (Sallé). 
Five specimens. Distinguishable from our other species, S. constrictus excepted, by 
the uniformly coloured, pale greyish, oval scales, the elytra with conspicuous decumbent 
sete. The tarsal claws are shorter than in S. constrictus, and the squamosity is 
imbricate. WS. thoracatus belongs to the section Synertha, Dietz, and seems to be nearly 
allied to S. imbricatus, Casey. | 
5. Smicronyx tenuirostris, sp. n. 
Oblong-ovate, shining, black, the femora and tibie partly rufescent ; the surface thickly clothed with coarse, 
pale brownish, oval, imbricate scales, with a few white ones intermixed, the elytral interstices each with 
a row of curled, decumbent setz. Rostrum slender, feebly constricted at the base, curved, nearly one- 
half longer than the prothorax, smooth and shining, punctulate at the sides towards the base; antennz 
long and slender, inserted at the middle of the rostrum; eyes contiguous beneath. Prothorax convex, 
nearly as long as broad, moderately rounded at the sides, rather sparsely punctate, the disc with a smooth 
median line. Elytra more than one-half broader than the prothorax, subparallel towards the base, 
with fine, sharply-cut strie, the outer strie distinctly punctured, the interstices almost flat and faintly 
punctulate. Legs comparatively slender. 
Length 1%, millim. (2.) 
Hab. Mextco, Guanajuato (Sallé). 
One specimen. Smaller and less elongate than S. thoracatus, with a long, smooth, 
slender rostrum, slender antenne, a smaller and less closely punctured prothorax, and 
more slender legs, the vestiture of the elytra mottled. From the same sex of S. spurcus 
the present species may be distinguished by the somewhat sparsely punctured prothorax 
and the more shining surface. 
6. Smicronyx tenuisquamis, sp. n. 
Oblong-ovate, rather dull, black, the sides of the elytra very broadly, and the femora and tibie, rufescent ; 
the surface sparsely clothed with coarse, decumbent, white, piliform scales. Rostrum stout, cylindrical, 
a little longer than the prothorax, feebly constricted at the base, rugulose, smoother at the tip, the 
antenne inserted at or slightly before the middle. Prothorax broader than long, convex, rounded at the 
sides, about equally narrowed in front and behind, densely, coarsely punctate, and with indications of a 
smooth, raised, median line. Elytra one-half wider than the prothorax, subparallel towards the base, 
with sharply-cut strie, the strie with not very closely-placed punctures, which become more. distinct 
towards the sides, the interstices rugulose and almost flat. 
Length 13-2 millim. 
SS 2 
