of the Amazon Valley. 6S 



somew"hat close relationship between Trichonim and Baryssims, 

 but this latter genus is amply distinguished by its crested centro- 

 basal tubercles. 



1. Trichonius quadrivittaius, n. sp. 



T. oblongus, subdepressus : thorace late, cinereo, fusco quadrivittato : 

 elytris apice obtuse breviter truncatis, cinereis, fusco multiguttatis^ 

 Long. 3\ lin. 2 • 



Head brownish ashy, vertex with two fuscous dots. Antennae 

 more than twice the length of the body, bristly both above and 

 beneath, reddish, bases of the joints from the fourth pallid. 

 Thorax short and broad; lateral spines conical, scarcely pointed, 

 and placed very near to the hind angles; surface smooth, 

 brownish ashy, darker in the middle, and with four distinct 

 dark-brown stripes, besides one less distinct on each side below 

 the lateral spines. Elytra rather depressed, slightly narrowed 

 behind, obliquely and very obtusely truncated at the tips, clothed 

 with long bristles, which arise from punctures placed in rows 

 independent of smaller punctures lying rather thickly towards 

 the base; brownish ashy in colour, with a large number of 

 small dark-brown spots which cover the setiferous punctures. 

 Body beneath and legs dingy ashy, the latter bristly. 



Villa Nova ; on dead branches. 



2. Trichonius fasciatus, n. sp. 



T. oblongus, subdepressus : thorace cinereo, fusco bivittato : elytris 

 apice truncatis, angulis exterioribus prominentibus, cinereis, pone 

 medium fusco fasciatis. Long. 3;^ lin. $ . 



Head brownish ashy. Antennae more than twice the length 

 of the body, blackish, with the basal jomt dull reddish, bristly 

 both above and beneath ; bases of the joints, from the fourth, 

 pallid. Thorax broad ; lateral spines thick, pointed, and slightly 

 curving behind ; surface smooth, brownish ashy, darker in the 

 middle, and with two distinct dark-brown vittae, besides two 

 dusky spots on each side above the lateral spines. Elytra rather 

 depressed, very slightly narrowed behind, transversely truncated 

 at the apex, with the exterior angles slightly produced; surface 

 clothed with long bristles, which arise from punctures placed in 

 rows independent of smaller punctures lying rather thickly to- 

 wards the base ; brownish ashy in colour, with a rather well- 

 defined dark-brown fascia lying behind the middle, besides two 

 small lateral marks of dark-brown colour, one near the base, the 

 other near the apex. Body beneath and legs reddish testaceous, 

 clothed with ashy down ; the legs bristly and ringed with dusky. 



Santarem. 



3. Trichonius picticollis, n. sp. 



T. oblongus, convexus : thorace spinis lateralibus crassis, leviter 



