366 Memoirs on the Coleoptera 



sculpture, vestiture and in some special structures, but it differs in 

 several rather important features. In A nisorrhamphus , for example, 

 the antennal club is more obtusely oval, the beak deeply constricted 

 at basal fourth or fifth and separated from the head by a much 

 coarser and deeper transverse sulcus, and the basal thoracic lobe 

 is longer though truncate; the pygidium is much more convex and, 

 finally, the fourth abdominal suture is feebly reflexed at the sides; 

 in the preceding genus there is no trace of posterior reflexion in any 

 of the sutures. However, that two really distinct genera can bear 

 such striking resemblance to each other, one would scarcely believe 

 possible. The single species from our region is the following: 



Anisorrhamphus mimus n. sp. — Oval, convex, shining, deep black, the legs 

 black, rufescent distally; squamules white, evident at the extreme sides of the 

 pronotum and dense on the scutellum, the large white scales dense throughout 

 beneath and on the legs; beak (c?) deep shining black, thick, feebly punctulate, 

 compressed, distinctly arcuate and about as long as the head and prothorax, the 

 subbasal constriction deep; between this constriction and the base there is a 

 feeble and more punctured, squamulose impression of the compressed sides; 

 antennae a little beyond apical third; prothorax fully a fourth wider than long, 

 the feebly converging sides gradually a little more rounding anteriorly to the apex, 

 which is almost three-fifths as wide as the base; punctures coarser and deeper 

 than in the preceding genus, without median smooth line, the punctures separated 

 by nearly their own diameters; elytra oval, more rapidly rounding behind to the 

 somewhat obtuse apex, a fifth wider than the prothorax and four-fifths longer, 

 the humeri slightly prominent; grooves abrupt and deep, much narrower than 

 the intervals, except at base, the interstitial punctures fine but distinct, partially 

 confused; pygidium subhemispherical, the upper part oblique and a little flatter; 

 abdomen without sexual modification. Length 2.8 mm.; width 1.3 mm. Brazil 

 (Chapada — forest). November. One specimen. 



A comparison of this species with a specimen of squamiventris 

 Chmp., from Cahabon, Guatemala, sent me by the author, shows 

 that mimus is slightly more rhombic, the humeri being more prom- 

 inent and has the pygidium somewhat smaller, but — more impor- 

 tant than these — the antennal scrobes are shorter and more oblique 

 in mimus and, on the whole, less inferior. 



Tropidobaris n. gen. 



This is one of the most remarkable genera of the Barinae in the 

 structure of the beak, there being a high and abrupt dorsal keel at 

 base. The body is rhombiform, convex, shining, with narrow and 

 very sparse squamules above, and larger separated scales beneath. 

 The beak beyond the keel is slender; it is evenly arcuate beneath 

 from base to apex and only very feebly separated from the head, 

 the mandibles bifid and decussate. The prosternum narrowly 

 separates the coxee and is feebly impressed along the middle, the 

 impression even more densely squamose than the sides, the posterior 



