424 SEKBICOBNIA. 



the antennas with the basal joint sometimes ferruginous in the dark specimens. Head densely, finely 

 punctate ; antenna? slender, about half the length of the body in the male, slightly shorter in the female. 

 Prothorax convex, slightly broader than long, a little wider at the base than at the apex, rounded at the 

 sides, the latter sinuate before the base : the hind angles distinctly divergent ; the surface closely finely 

 punctate, with slightly coarser punctures intermixed ; the base with a short deep sulcus on either side. 

 Elytra moderately elongate, considerably wider than the prothorax, subparallel to about the middle and 

 narrowing thence to the apex, the humeri rounded ; deeply and coarsely punctate-striate, the interstices 

 convex and sparsely punctured. Beneath densely and finely punctate, with slightly coarser punctures 

 intermixed. 

 Length 9|-11|, breadth 3-3f millim. (<?$.) 



Hah. Mexico, Chilpancingo in Guerrero, Jalapa in Vera Cruz (Edge). 



Fifteen specimens. This insect is of about the same size and shape as A. pruinostis, 

 but differs from it in having the thorax more sinuous at the sides behind, with the hind 

 angles distinctly divergent ; the genitalia of the males are also differently formed. 



A male from Chilpancingo is figured. 



10. Aptopus uniformis. 



Moderately elongate, feebly shining, rather sparsely clothed with long, fine, yellowish-cinereous pubescence ; 

 piceous, brown, or reddish-brown, the elytra in one specimen much paler than the prothorax ; the 

 antennae and legs testaceous or ferruginous. Head closely, finely punctate ; antennas slender, half the 

 length of the body in the male, shorter in the female. Prothorax slightly broader than long, wider at 

 the base than at the apex, rounded at the sides, the latter feebly sinuate before the base ; the hind angles 

 rather short ; the surface very closely, finely, uniformly punctate ; the base with a deep sulcus on either 

 side. Elytra moderately long, considerably wider than the prothorax, subparallel to near the middle and 

 narrowing thence to the apex ; deeply punctate-striate, the interstices convex and sparsely punctured. 

 Beneath closely, finely, uniformly punctate. 



Length 6f-8|, breadth 2-2| millim. ( J $ ). 



Hal. Mexico, Chilpancingo in Guerrero (H. II. Smith), Guanajuato (Salle). 



Five specimens. This species may be chiefly distinguished amongst its allies by the 

 close, fine, uniform punctuation of the thorax. A. uniformis is allied to A. peregrinus, 

 Horn, from Texas, a specimen of which is before me, but differs from it in having the 

 thorax still more closely punctured, with the hind angles less divergent. It is less 

 elongate than A. omiltemanus. 



11. Aptopus constrictus. 



Moderately elongate, shining, somewhat sparsely clothed with yellowish-cinereous pubescence ; piceous, the 

 scutellum, the suture, and an indeterminate vitta on each elytron extending from the shoulder downwards 

 reddish-brown; the antennas ferruginous, the legs ferrugineo-testaceous. Head closely punctured; 

 antennas slender, half the length of the body in the male, a little shorter in the female. Prothorax 

 broader than long, about equal in width at the base and apex, moderately rounded at the sides in the 

 male, strongly so in the female, the sides feebly sinuate before the base ; the hind angles rather short ; 

 the surface closely, uniformly, and very minutely punctate ; the base with a short incision on either side. 

 Elytra moderately long, much wider than the prothorax, subparallel to the middle iu the male, more 

 rounded at the sides in the female ; coarsely and deeply punctate-striate, the interstices convex through- 

 out and sparsely punctured. Beneath closely, finely, uniformly punctate. 



Length 7-7|, breadth 2-2| millim. ( tf $ .) 



