1905. | OF PHYTOPHAGOUS COLEOPTERA. 439 
O. cardinalis in the coloration of the head and the antenne, in 
the scarcely rounded sides of the thorax, and in the shape of the 
posterior elytral band. The same differences separate the species 
from others nearly similarly marked. 
This is one of the most difficult sections of the genus, as the 
amount of variation in regard to the elytral bands, their shape 
and size, can only be ascertained where sufficient material is at 
hand ; neither coloration nor sculpture can always be relied upon 
in these insects. 
OEDIONYCHIS ARCUATA, Sp. D. 
Black, the head bluish; clypeus flavous; thorax impunctate, 
flavous ; elytra closely and distinctly punctured, flavous, a broad 
transverse band at the base, a transverse large spot below the 
middle, and the apex metallic blue. 
Length 6 millim. 
Head bluish black, strongly punctured at the sides above the 
eyes, frontal elevations broadly transverse ; clypeus flavous ; 
antenne black, third joint scarcely shorter than the fourth, 
terminal joints rather robust and short; thorax more than twice 
as broad as long, the sides with a deep but not very broad sulcus, 
anterior angles strongly thickened but scarcely produced, the 
lateral margins rounded anteriorly, straight at the base, the disc 
very finely punctured when seen under a strong lens, flavous, the 
base with a very obsolete transverse sulcus; scutellum black; 
elytra with very narrow reflexed lateral margins, not depressed 
below the base, very closely and more or less strongly punctured, 
the anterior half of their length occupied by a transverse blue 
band not extending to the lateral margins, its posterior edge 
concave, immediately below the middle is another large transverse 
band which has its anterior margin convex and the posterior one 
rounded, the extreme apex of each elytron is likewise metallic 
blue; under side and legs black. 
Hab. Colombia. 
Hvidently closely allied to O. labiata Schauf., but the fourth 
joint of the antennz in that species is described as the longest ; 
the elytra are described as nearly smooth, and the first transverse 
band as being interrupted at the suture; the same is the case 
with the second band, which is said to be composed of two spots. 
OEDIONYCHIS BIPARTITA, Sp. n. 
Broadly ovate, convex, black, the clypeus and the thorax 
fulvous, the latter very minutely punctured, the angles mucro 
nate; elytra extremely closely and finely punctured, flavous, a 
transverse band at the base, another one at the middle, and a 
third near the apex, bright metallic green. 
Length 7-8 millim. 
Head black, impunctate, diameter of each eye about as wide as 
the dividing space, clypeus fulvous, frontal elevations narrowly 
Proc. Zoou. Soc.—1905, Vou. II. No. XXX. 30 
