1 68 Memoirs on the Coleoptera 



deep angular impression. The antennae are much longer, inserted 

 very slightly behind the middle, the funicle slender, its first joint 

 as long as the next four, the second nearly twice as long as wide, 

 the club abrupt, large, oval, with distinct sutures and not quite as 

 long as the preceding six joints. The legs are notably long and very 

 slender, the femora mutic. The anterior coxae are rather widely 

 separated. The type is the following: 



Crostidia tenuipes n. sp. — Elongate, subrhomboid, shining, although the entire 

 surface is feebly micro-reticulate, subglabrous, only the scutellum, legs, meta- 

 sternum and its side-pieces with more or less evident setiform squamules; entire 

 body and legs pale red-brown in color; beak rather slender and strongly, sub- 

 evenly arcuate, very feebly tapering and fully half as long as the body, cylindric 

 though narrower in distal half, the punctures at the sides not dense but distinct, 

 fine above; prothorax two-fifths wider than long, the sides subparallel, feebly 

 sinuate, faintly diverging at base, rapidly rounding and converging from slightly 

 beyond the middle to the very abrupt tubulation, which is a little more than 

 half as wide as the base; surface smooth, finely, strongly punctate on the sides 

 and down the inferior flanks; basal lobe gradual, obtusely cuspidiform; scutellum 

 moderate, squamulose, quadrate, sinuate behind; elytra fully one-half longer 

 than wide, a third wider than the prothorax and two and three-fourths times as 

 long, elongate-parabolic, the humeri distinctly prominent and obtusely sub- 

 angulate laterally, the apex conjointly somewhat narrowly rounded; striae deep, 

 smooth, moderately narrow and evenly grooved; intervals very even, flat, three 

 or four times as wide as the grooves, virtually smooth; under surface rather 

 finely punctate, the abdomen sparsely so. Length 2.85-3.0 mm.; width 1.35- 

 1.38 mm. Brazil (Santarem). Two specimens. 



Easily recognizable by the glabrous surface, tubulate prothorax, 

 slender and strongly arcuate beak and long elytra, and, from the 

 preceding, by the prominent humeri, flat strial intervals, convex 

 and not deplanate sides of the body and longer beak and antennae. 

 The two genera might possibly form a subtribal group, but are not 

 more intimately related between themselves. 



Megavallius n. gen. 



This is a genus of large and conspicuous, in great part glabrous, 

 shining and feebly sculptured species, having in every instance a 

 small spot of dense pale scales on the fourth strial interspace, near 

 three-fifths from the base. The beak is moderately long, strongly 

 punctate but shining and distinctly arcuate, the mandibles arcuate 

 and bifid but not very broadly overlapping, so that they are prom- 

 inent when closed. The antennae are slender, loosely jointed and 

 medial, the first two funicular joints elongate, the second the shorter, 

 the club rather small and narrowly oval, abrupt, with the first 

 segment generally about half the mass. The anterior coxae are 

 separated by about half their width, the prosternum not at all 

 armed in the male, the femora barely at all inflated, strongly, 

 loosely punctate and mutic, the tibiae simple and the tarsi rather 



