438 Memoirs on the Coleoptera 



'broad, very gradually formed and narrowly blunt basal lobe, and 

 moderately close-set, triangular scutellum, the sides of which are 

 slightly arcuate. The elytral surface is very even, the striae rather 

 fine, the pygidium nearly as in Glyptobaris, but the abdomen is 

 much more elongate and less triangular. The type is the following: 



Amphibaris obliquata n. sp. — Slender, only very moderately convex, sub- 

 parallel, gradually narrowed posteriorly, moderately shining, piceous-brown in 

 color, with oblong slender yellowish scales, very irregular in distribution, there 

 being very few widely scattered on the pronotum, more numerous on the subbasal 

 part of the elytra, rather dense at the base of the third interval and near the 

 humeri and also rather close-set in a wide oblique line extending outwardly 

 behind the scutellum and largest near the central point of each elytron, wanting 

 behind this chevron; beneath, they are whiter, forming a dense spot before each 

 anterior coxa and dense throughout the met-episterna; beak thick, arcuate, as 

 long as the head and prothorax and with a few large scales before the eyes; pro- 

 thorax only a fourth wider than long, the sides parallel and straight, rapidly 

 rounding and oblique in apical third to the tubulation, which is more than half 

 as wide as the base; rugulosity rather fine and dense, replaced by some isolated 

 punctures near the smooth median line visible in basal half; elytra one-half 

 longer than wide, just visibly wider than the prothorax and four-fifths longer, 

 the oblique sides feebly arcuate, the apices rounded ; grooves narrow, not evidently 

 punctate, the intervals flat, minutely, sparsely punctulate; first two connate 

 ventral segments about half the entire abdominal length. Length 2.35 mm.; 

 width 0.85 mm. Brazil. 



A single specimen was sent to me by Desbrochers des Loges, 

 without indication of locality, other than that noted. 



Opertes n. gen. 



The body in this genus is broadly oval and strongly convex, with 

 undulated elytra and almost glabrous surface. The beak is rather 

 long and thick, evenly arcuate and densely punctate, not separated 

 by a distinct impression and feebly compressed. Antennae slightly 

 beyond the middle, moderate in length, the first two funicular 

 joints evidently elongate, the outer joints slightly increasing, the 

 club moderate, oval, entirely pubescent and, as in Glyptobaris, 

 having very distinct sutures. Prosternum with a deep and sharply 

 marked parallel canal, separating the coxae by rather more than 

 their width, the posterior lobe short, broadly sinuate. The pro- 

 thorax is gradually tubulate at apex and with small rounded basal 

 lobe, the scutellum flat, wider than long, closely fitted, truncate at 

 base, parallel at the sides and broadly angulate at apex. The 

 elytra are moderately grooved, the pygidium more than twice as 

 wide as long and rather convex, vertical, the legs and tarsi moderate 

 and normal. The type is as follows: 



Opertes submetallicus n. sp. — Broadly oval, convex, shining, the elytra alu- 

 taceous, dark, with bright bronzy lustre throughout; the only vestiture above is 

 composed of slender whitish scales, condensed in a small quadrate spot at the 



