390 



Mr. I). S^^j) 'j^ Confi-i/jutio/is to fhe 



shining, rather s])arin<>;ly but dl;-tinctly puncturcfl, tlic 

 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 punctured, the punctures are most 

 numerous about the middle, nearly wanting at the sides, 

 and there is a very indistinct longitudinal space along the 

 middle smooth. Elytra mnch longer than the thorax, 

 very shining, rather coarsely and sparingly punctured, 

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

 conical cylindrlc, being much naiTowed towards the ex- 

 tremity ; the surface nearly opa(pie, being finely pubescent, 

 and covered Avitli a peculiar obsolete punctuation. Legs 

 reddish, the tibiae bearing hair-like spines, which are most 

 distinct on the intermediate legs. Prosternum short, with 

 a very fine tubercle in front of the coxte; mesosternum 

 with a sharply-elevated laminar carina; metastcrnum with 

 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 ])ro- 

 jection is more elongate and the angle at its extremity 

 more acute in the female than in the male. 



Tapajos ; five individuals. 



Obs. — This species departs widely in its fades from 

 //. durus, and in the structure of its hind body ai)proaches 

 to Lispinus ; the dorsal ])late of the 8th segment has not 

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

 the species of Osorius ; the ventral plate appears to be 

 absent as in //. durus, the under face of the segment 

 being formed by the folded lateral plates, which are ample, 

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

 same parts in //. durus. 



3. Holotrochus puhescens, n. sp. Ferrnglneus, densius 

 pnbescens, obsolete punctatus, hand nitldus ; prothorace 

 transverso, angulis posterioribus fere acutis. Long. corp. 

 U lin. 



Antennae yellowish, 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 



