460 Memoirs on the Coleoptera 



evenly arcuate throughout; apex much more than half as wide as the base; 

 punctures relatively small, dense laterally, moderately separated medially, 

 with a narrow but distinct smooth line; scutellum small, slightly transverse; 

 elytra a third longer than wide, parabolic, but much less obtusely rounded 

 than in the preceding, distinctly wider than the prothorax and two-thirds 

 longer; grooves narrow, distantly punctate; punctures of the single inter- 

 stitial series fine and shallow, somewhat well separated; pygidium small and 

 but feebly convex. Length 1. 6-1. 65 mm.; width 0.6 mm. Brazil (Chapada 



— campo). October. Three specimens parvus n. sp. 



23 — Upper surface rather shining, subequally micro-reticulate, convex, rather 

 narrow, the sides rectilinearly parallel, black in color; beak (o 71 ) as long as 

 the head and prothorax, evenly and moderately arcuate, moderately slender, 

 strongly and closely punctate; antennae medial, the scape not quite as long 

 as the stem, the club very evenly oval; prothorax about as long as wide, 

 the parallel sides gradually broadly rounding beyond about the middle, to 

 the wide subtubulate apex, which is about three-fifths as wide as the base; 

 punctures densely subrugulose laterally and with fine squamules, smaller 

 and separated by barely their widths medially, with a narrow feeble im- 

 punctate line forming the summit of a slight prominence of the surface; 

 scutellum small, free, transverse; elytra oblong, two-fifths longer than wide, 

 exactly equal in width to the prothorax and three-fifths longer, the sides 

 parallel and straight, circularly rounded in about apical third; grooves 

 rather narrow, scarcely punctate; punctures of the single interstitial series 

 small, moderately separated, each with a distinct slender whitish squamule; 

 pygidium small, moderately convex. Length 2.2 mm.; width 0.8 mm. 

 Brazil (Chapada — campo). October. One specimen cylindrellus n. sp. 



It is highly probable that the two primary sections denned above 

 constitute subgenera, but in some respects the very distinct tenui- 

 rostris, with its deep black elytra and blue-black prothorax, forms 

 an intermediate; it has very coarsely punctured elytral grooves 

 toward base. The species named imitator might almost as well be 

 placed in the valens section, as some general characters, such as 

 elytral punctuation, correspond, and differ much from those of 

 umbratilis and tritus, but the bifurcating prominence of the pro- 

 sternum seems to be obsolete. The small and rather obscure species 

 of this genus must be extremely numerous, but most of them have 

 excellent definitive specific characters. 



Neogivenius n. gen. 



In spite of the notably different habitus, due to the more elongate 

 cylindric body and tubulate prothorax, this genus is closely allied 

 to Heterosternns. The beak is long, slender, evenly and moderately 

 arcuate, separated from the head by a small depression and is 

 feebly sculptured. Antennae nearly as in the preceding genus, but 

 more basal. Prosternum with a deep canal, which is apparently 

 not bifurcate behind, the coxae rather small and separated by 

 almost twice their width, the posterior lobe rather long, gently 

 sinuate at apex, the legs short, with rather long, slender tarsi, the 

 fourth joint very long, slender and the claws apparently free, 



