82 Memoirs on the Coleoptera 



basally; abdomen tumid and strongly sculptured at base as in Hiotus; femora 

 slender, simple, strongly punctate; hind tibiae somewhat fluted, having, on the 

 outer edge near basal third, a very abrupt acute denticle, the basal slope of which 

 has about two minute serrules. Length 2.7 mm.; width 2.1 mm. Brazil (Cha- 

 pada). March. One specimen. 



The humeral prominences of the elytra, distinctly posterior to 

 the base, are more acute and angulate than in any of the forms of 

 Diorymerus or Hiotus known to me. 



A small half dozen lot of Mexican and Central American Diory- 

 merides in my collection, forms an interesting addendum to the 

 preceding taxonomic studies of the Brazilian species. They are all 

 small and only one of them is a Diorymeriis; it may be described 

 as follows: 



Diorymerus vestigialis n. sp. — Almost evenly oval, the humeri very broadly 

 rounded and scarcely at all prominent, deep polished black throughout; beak 

 thick, compressed, distally arcuate, scarcely three-fourths as long as the prothorax, 

 rather closely punctate, finely so above; head finely, sparsely punctate; antennal 

 club of the usual form, cylindric-oval, compact and as long as the funicle; pro- 

 thorax but slightly wider than long, the strongly converging sides evenly and 

 distinctly arcuate, the subtubulate apex less than half as wide as the base; surface 

 evenly convex, very smooth, the lower part of the inferior flanks with coarse and 

 sparse punctures; basal lobe strongly rounded and with a few small punctures, 

 the apex having a minute feeble angulate sinus, the lateral basal impressions 

 distinct but not deep; scutellum moderate, flat, quadrate, with a few very minute 

 punctures; elytra slightly longer than wide, a fifth wider than the prothorax, 

 oval, rather obtuse behind; striae excessively fine and subobsolete, remotely 

 punctulate, the sutural only a little coarser but with coarser punctures, the latter 

 visible basally also in other striae; femora parallel; hind tibiae obliquely rounded 

 externally toward base, the distal limit of the arcuation bearing an abrupt and 

 very acute, somewhat oblique spine; first ventral with coarse and sparse punc- 

 tures, not much impressed medially. Length 4.0 mm.; width 2.7 mm. Guate- 

 mala (Panzos — 500 feet elev.). One specimen. 



Probably belongs near Iceviusculus Chmp., but differs very much 

 in the scutellum and doubtless in other characters also. In the 

 above table of Diorymerus it should be attached to the section 

 numbered 26, composed of very small and polished completely 

 black species. 



Diorymerus denticulatus Chmp., of which I have a specimen 

 from the author, belongs to the subgenus Melanolia of Hiotus, and 

 is closely allied to the species described above as definitus; this 

 particular section, having internally serrulate hind tibiae, is dis- 

 tinguished also by having the scutellum medially prominent at the 

 apical margin; denticulatus has a much smaller and relatively less 

 laterally rounded prothorax than definitus, and also very differently 

 sculptured; the tarsal claws are strongly arcuate and widely free. 



The following species is also a Melanolia, coming near vidsus, and 

 having the prothorax much larger and fuller than usual: 



