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2. Trichonius fasciatuSy n. sp. 
T. oblongus, subdepressus ; tborace cinereo, fusco bivittato : elytris 
apice truncatis, angulis exterioribus prominentibus, cinereis, pone 
medium fusco fasciatis. Long. 3^ lin. 5 . 
Head brownish ashy. Antennae more than twice the length 
of the body, blackish, with the basal joint 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 picticolliSf n. sp. 
T. oblongus, convexus : thorace spinis lateralibus crassis, leviter 
curvatis, dorso brunneo vittis posticis duabus nigris intus albo 
notatis : elytris breviter setosis, brunneis, postice nigro alboque 
guttatis, apice rotundatis. Long. 3^ lin. . 
Head dingy brown. Antennae scarcely twice the length of the 
body, setose, the bristles much longer and more numerous be- 
neath than above ; reddish, tips of all the joints blackish ; bases 
of the joints, from the fourth, pallid. Thorax broad, lateral 
spines very thick, large, and pointed, slightly curving and placed 
at a short distance from the posterior angles ; surface anteriorly 
clear brown, posteriorly dusky, with two indistinct black vittae 
not reaching the front margin, and dotted on their inner sides 
with whitish ; there are also other white specks on the base and 
sides. Elytra rather more convex than in the allied species, 
scarce perceptibly truncated at the tips ; surface clothed with 
shortish bristles, which are decumbent, instead of suberect as in 
the preceding species, and which arise from punctures placed in 
rows independent of the smaller irregular basal punctures ; the 
colour is purplish brown, with a few indistinct black streaks and 
dots, and, behind the middle, a number of white specks. Body 
beneath and legs reddish, clothed with ashy pile ; legs hirsute, 
but not bristly. 
S. Paulo, Upper Amazons. 
