1905.] OF PHYTOPHAGOUS COLEOPTERA. 439 



0. cardinalts in the coloration of the head and the antennje, in 

 the scarcely rounded sides of the thorax, and in the shape of the 

 posterior elytral band. The same differences separate the species 

 fi'om 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, 



Oedionyohis arcuata, sp. n. 



Black, the head bhiish ; clypeus fiavous ; thorax impunctate, 

 fiavous ; elytra closely and distinctly punctured, fiavous, a broad 

 transvei'se 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 ; 

 antennfe 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, fiavous, the 

 base with a very obsolete transverse sulcus ; scutellum black ; 

 elytra with very nari'ow reflexed lateral margins, not depressed 

 below the base, very closely and more or less strongly punctvired, 

 the anteiior half of their length occupied by a transverse blue 

 band not extending to the lateral margins, its postei-ior 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. 



Evidently closely allied to 0. lahiata Schauf., but the fourth 

 joint of the antennae in that species is described as the longest ; 

 the elytra are described as nearly smooth, and the first transverse 

 Imnd as being interrupted at the suture ; the same is the case 

 with the second band, which is said to be composed of two spots. 



Oedionyohis 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, fiavous, 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. Zool. Soc— 1905, Yol. II. No. XXX. 30 



