1902.J OF AMERICAN COLEOPTBRA. . 201 



OXYGONA NIGRICOLLIS, Sp. n. 



Black, head and thorax impunctate ; elytra pale flavous, nearly 

 impunctate. 



Length 5-6 millim. 



Head entirely impunctate, with an oblique depression above 

 the eyes, the frontal tubercles strongly raised, the carina short 

 and broad ; antennse black, extending beyond the middle of the 

 elytra, the third and the following two joints very elongate, 

 the others shoi"ter ; thorax more than twice as broad as long, the 

 sides subangulately rounded before the middle, strongly narrowed 

 at the base, with a broad reflexed margin, the anterior margin 

 accompanied by a narrow sulcus, the disc entirely impunctate, 

 shining, black ; scutellum black ; elytra pale flavous, extremely 

 minutely punctured ; below and the legs black. 



Hah. Espirito Santo, Brazil. 



This typical Oxygona, of which three specimens are before me, 

 is well distinguished by its system of coloration. 



Orepidodera plavomaculata, sp. n. 



Piceous, above black, the basal joints of the antennae and the 

 legs (the posterior femora excepted) testaceous ; thorax opaque, 

 minutely punctured and granulate, feebly transversely sulcate ; 

 elytra very closely punctate-striate, piceous, the humeral callus 

 and the apex flavous. 



Length 2| millim. 



Head entirely impunctate, black, the frontal elevations obsolete, 

 clypeus convex between the antennae, labrum flavous ; antennae 

 extending beyond the middle of the elytra, testaceous, the 

 terminal joints more or less darkened, second and third joints of 

 equal length, shorter than the fourth, terminal joints thickened ; 

 thorax subquadrate, one- half broader than long, the sides nearly 

 straight, the angles distinct, the surface opaque, finely punctured 

 and minutely granulate, the basal sulcus feeble, not extending 

 to the sides, the space below it also distinctly punctured ; 

 scutellum black, impunctate ; elytra wider at the base than the 

 thorax, extremely closely punctured in irregular rows, the apex 

 much more finely punctate, the di,sc blackish, the shoulders with 

 a small flavous spot, the apex more or less broadly of the latter 

 colour, the space along the suture somewhat depressed ; below 

 piceous, the legs testaceous or flavous, the posterior femora piceous, 

 their metatarsus as long as the two following joints together, all 

 the tibiae with a small spine, presternum very narrow ; the anterior 

 coxal cavities closed. 



Hah. Ooncepcion, Talcahuano, Chili. 



The thorax in this species is of an opaque, silky appearance 

 and the sulcus but feebly impressed, although distinct. I cannot 

 refer this insect to any of the species described by Philippi from 

 the same country. 



Proc. Zool. Soc— 1902, Vol. I. No. XIV. 14 



