390 ]\rr. D. Sharp's Contrlhutiinis to the 



sliiiiiiifj, ratlier sparing-ly but distinctly pnncturcfl, the 

 vertex smooth. Thorax strongly transverse, the sides 

 slightly curved, about as broad at the hind as at the front 

 angles; the hind angles sharply-marked right angles, 

 much more elevated than the front ones ; the lateral 

 margin very fine; close to each hind angle is a large broad 

 and deep impression ; the surface is shining, and it is 

 distinctly, not closely pnnctm'ed, the pnnctures are most 

 numerous about the middle, nearly Avanting at the sides, 

 and there is a very indistinct longitudinal space along the 

 middle smooth. Elytra much longer than the thorax, 

 very shining, i-ather coarsely and sparingly punctured, 

 each with a well-marked sutural stria. Hind body elongate, 

 conical cylindric, being much narrowed towards the ex- 

 tremity; the surface nearly opaque, being finely pubescent, 

 and covered Avith a peculiar obsolete pimctuation. Legs 

 reddish, the tibia bearing hair-like spines, AAdiich are most 

 distinct on the intermediate legs. Prosternum short, with 

 a very fine tubercle in front of the coxaj; mesosternum 

 with a sharply-elevated laminar carina; metasternum Avitli 

 a short, coarse channel, shining, sparingly punctured. 



In both sexes the ventral plate is produced at the 

 extremity, so as to form an angular projection; this pro- 

 jection is more elongate and the angle at its extremity 

 more acute in the female than in the male. 



Tapajos ; five individuals. 



Ohs. — This species departs Avidely in its facics from 

 //. durus, and in the structure of its hind body a})})roaches 

 to Lispinus ; the dorsal plate of the 8th segment has not 

 the peculiar box-like structure found in H. durus and in 

 the species of Osoj-ius ; the ventral plate appears to be 

 absent as in 7/. durus, the under face of the seirment 

 bemg formed by the folded lateral plates, Avhich arc ample, 

 and have quite lost the very hard, spinous character of the 

 same parts in //. durus. 



.3. Jlolotrochus pubcsrens, n. sp. F(!rrugincus, densius 

 l)ul)cscens, obsolete punctatus, hand nitidus ; prothoracc 

 transverse, angulis posterioribus fere acutis. Long. corp. 

 1^ lin. 



Antenna? yelloAvish, rather short; 1st joint stout and 

 rather long, 2nd joint oval, .3rd joint about as long as 2nd, 

 slender at the base; 4th joint smaller than the others, 

 5th and 6th about equal, bead-like; 7 — 11 broader than 



