Brazilian Barin/e 83 



Hiotus (Melanolia) thoracicus n. sp. — Obtusely oval, very deep black and 

 polished; beak thick, feebly, subevenly arcuate, four-fifths as long as the pro- 

 thorax, slightly compressed and closely, strongly sculptured at the sides, more 

 finely and rather closely so above and having a transverse shallow medial impres- 

 sion at base; prothorax large, a fourth wider than long, the sides strongly arcuate, 

 becoming more parallel basally, the tubulate apex three-sevenths as wide as the 

 base; surface very smooth, with a few punctures along the lateral edges, con- 

 tinued sparsely down the inferior flanks; basal lobe small, sinuate at apex, 

 having a few small punctures, the lateral impressions distinct; scutellum longer 

 than wide, feebly enlarged and posteriorly subangulate at apex, smooth and 

 concave; elytra slightly elongate, only very little wider than the prothorax, 

 ogival, with narrowly rounded apex, the humeri broadly rounded and but slightly 

 prominent; striae fine though very distinct and rather conspicuously, somewhat 

 distantly punctate, the sutural smoother, finely groove-like, 9 and 10 coarse and 

 deep; legs strongly punctate; outer tibial angle at base sharp but not prominent; 

 first ventral swollen and coarsely, very densely punctate. Length 3.4 mm.; 

 width 2.3 mm. Mexico (Vera Cruz). One specimen. 



This species is rather closely allied to vulsus, described above, 

 differing in its basally more parallel prothorax, less pyriform 

 scutellum and finer striation. 



The two following species are entirely typical in the subgenus 

 Hiotopsis: 



Hiotus (Hiotopsis) stolidus n. sp. — -Oval, black throughout and rather shining; 

 beak thick, strongly punctate, shorter than the prothorax, which is not quite as 

 long as wide, with strongly and very evenly arcuate sides from base to the sub- 

 tubulate apex, the latter rather more than two-fifths as wide as the base; surface 

 smooth, punctured along the base and also sparsely but strongly near the sides, 

 these punctures continuing down the inferior flanks; lobe small, its apex very 

 narrowly rounded; scutellum very small, quadrate, not obviously impressed; 

 elytra only slightly wider than the prothorax and barely longer than wide, oval, 

 with moderately prominent rounded humeri; striae fine but distinct, gradually 

 feeble laterally, feebly punctulate, 9 and 10 broader but shallow, entire and 

 catenulate; outer tibial angle sharp but rather obtuse and not prominent. Length 

 1.9 mm.; width 1.3 mm. Panama and Guatemala. Two specimens. 



The specimen from Guatemala seems to be virtually identical, 

 specifically, with the Panama type, although still stouter in form. 

 The following is closely allied: 



Hiotus (Hiotopsis) aequalis n. sp. — Body oval and very nearly as in the pre- 

 ceding, polished black, but with the elytra feebly picescent; beak almost similar, 

 but not quite so thick; prothorax narrower, more nearly as long as wide, the 

 sides less evenly arcuate, being straighter to about apical third, there gradually 

 rounding to the subtubulate apex, which is three-sevenths as wide as the base; 

 sculpture throughout similar, except that the strong lateral punctures are more 

 nearly confined to the edge, appearing less broadly upon the disk, and that the 

 basal lobe is more obtuse at apex; scutellum minute, quadrate, smooth medially, 

 somewhat impressed at apex; elytra nearly similar but narrower and with more 

 distinct strial punctures; hind tibiae with the external subbasal angle sharp and 

 slightly more prominent, the tibiae a little narrower. Length 1.8 mm.; width 

 1.2 mm. Guatemala. 



