of the Amazon Valley. 51 



The first joint of the tarsi is also much elongated in the same 

 sex. The elytra are square at the tips, being truncated largely 

 and transversely. 



4. 0. bituberculata, n. sp. 



O. angustata, depressa, tomento tenuissimo holosericeo cinereo-brun- 

 neo vestita : elytris maculis tribus lateralibus Tiolaceo-brunneis, 

 quarum secunda striga undulata transversa emittente, tertiaque 

 parva notatis. Long. 7-8 lin. cf $ . 



Head dusky : eyes nearly touching the central furrow on the 

 vertex. Antennse piceous, thinly clothed with grey pile ; apices 

 of the joints dusky. Thorax even, with two prominent discal 

 tubercles, shining black, the third, posterior, totally wanting; 

 punctured on the disk as well as on the fore and hind margins ; 

 lateral tubercles large, obtuse. Elytra very long, tapering from 

 base to apex, the tips obliquely truncated, the external angles 

 of the truncature much produced and acute ; punctured through- 

 out; two short I'ows of tubercles along the humeral elevations, 

 two others on the disk near the base, and one of smaller tubercles 

 along the suture ; in some specimens the sutural row and one 

 of the discal ones are nearly obsolete, in all they consist of a 

 small number of tubercles : the sinuations between the purple- 

 brown lateral spots are edged with white scales ; the apical spot 

 is very small, the other two large and semi-oval. The under- 

 surface of the body and legs ashy ; the femora varied with dusky ; 

 two rings round the tibiae black. 



I took this species at Ega and on the banks of the Tapajos. 

 It is also found at Cayenne. I have received specimens from 

 Paris labelled obscurata and opaca ; but I cannot find any species 

 published under those names. 



5. 0. rufofasciata, n. sp. 



O. curta, depressa, tomento holosericeo argenteo-griseo vestita: elytris 

 subtriangularibus, fascia basali rosacea postice late nigro marginata, 

 prope apicem lineis vermicularibus argenteis et fuscis omatis. 

 Long. 6 lin. S . 



Head dusky: eyes approximating on the vertex. Antennse wholly 

 clothed with silvery-grey pile. Thorax short and broad, dusky 

 grey: lateral tubercles conical; anterior discal ones large, slightly 

 elevated, transverse, clothed with pile; posterior one slightly 

 elevated. Elytra wide at the shoulders, tapering to the tips, 

 which are obliquely truncated, the external angles of the trunca- 

 ture slightly produced and directed outwards ; closely granulate- 

 punctate at the base; silvery-grey, the base with a rose-red 

 fascia, behind which is a dusky-brown belt shading off poste- 

 riorly. Under-surface of body and legs clothed with grey pile. . 



At Ega, on felled Pama (a wild fruit) trees in the forest. 



4* 



