St(/pltf/li?itd(je of the Amazon Valley. 103 



ing little from one aiiotlier, each a little shorter than 

 broad ; last joint longer than the 10th, obtnsely pointed 

 on one side. Head large, qnite as broad as the thorax, 

 above densely and coarsely punctured, a space along the 

 middle free from the coarse punctures, but with a few 

 fine and indistinct ones ; besides this there are three or 

 four still larger punctures on each side mixed with the 

 others, and in front of the middle there is a transverse im- 

 punctate space ; on the underside it is extremely dull, 

 densely and finely rugulose-punctate. Thorax as broad 

 as the elytra, as long as broad, black, very shining, with 

 fine punctures scattered over it, with a dorsal series of 

 six punctures on each side the middle, with seven or eight 

 other punctures on each side near the front part, and just 

 inside the lateral margins, with a narrow strip of coarse 

 dense punctuation extending also some way along the 

 front and hind margins. Elytra scarcely longer than the 

 thorax, densely and finely punctured, nearly opaque, and 

 with a very fine fuscous pubescence. Hind body opaque, 

 densely and finely punctured, the apical segments more 

 coarsely than the others. Legs dusky reddish, very 

 pubescent. 



Ega: two specimens, S and ?. 



Obs. — Besides these tAvo individuals, there is another 

 S specimen from Pebas, which differs in several slight 

 particixlars and may possibly be a distinct species, but 

 more probably is only a local form of P. major. 



2. Plati/prosopiis laticeps, n. sp. Nigro-fiiscus, capite 

 prothoraceque disperse punctatis, nitidis, elyti'is abdo- 

 mineque dense subtilitcr punctulatis, fusco-pubescentibus, 

 opacis ; pedibus obscure rufis. Long. corp. 7 — 8 lin. 



Much smaller than P. major, and without the marginal 

 punctuation of the thorax. The antennas are moderately 

 stout, and reach about half-way to the back of the thorax ; 

 they are of an obscure dull-reddish coloiu' ; the 3rd joint 

 much longer than the 2nd; 4 — 10 differing but little from 

 one another, the 10th about as long as broad. The head 

 is quite as broad as the thorax ; above it is coarsely, 

 irregularly and rather sparingly punctured, the punctures 

 less numerous about the middle than at the sides; scattered 

 with the coarser punctures are numerous very fine ones; 

 on the underside it is quite dull, densely and finely 

 rugulose-pvmctate, and with a fine fuscous pubescence. 



