of the Amazon Valley. 53 
somewhat close relationship between Trichonius and Baryssinus, 
but this latter genus is amply distinguished by its crested centro- 
basal tubercles. 
1. Trichenius quadrivittatus, n. sp. 
T’. oblongus, subdepressus : thorace lato, cinereo, fusco quadrivittato : 
elytris apice obtuse breviter truncatis, cinereis, fusco multiguttatis. 
Long. 3¢ lin. 9. 
Head brownish ashy, vertex with two fuscous dots. Antennz 
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. 34 lin. 2. 
Head brownish ashy. Antenne 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 vitte, 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 
