1905.] OF PHYTOPHAGOUS COLEOPTERA. 445 



times slightly concave near the suture, both bands do not quite 

 extend to the lateral margins of the elytra ; under side and legs 

 black, the apex of the abdomen sometimes more or less fvxlvous ; 

 prostei'num longitudinally carinate at the middle. 



Hah. Peru. 



The characteristic feature of this species, by which it may 

 be principally distinguished fi'om the many similarly coloured 

 ones, is the shape of the elytral blue posterior band, of which the 

 posterior edge is broadly rounded instead of straight ; the flavous 

 band which separates the blue ones at the middle is generally, but 

 not always, of about the same width as that of the basal dark 

 band, sometimes broader. 0. alacris Erich, and 0. 2~>romta Erich, 

 ai'e described with black not blue bands, and the former with 

 the head rufous, the other with a broad median flavous band ; 

 other details are not given. The eight specimens before me show 

 no variation of any importance, but I may add that the posterior 

 elytral band is in all cases broader (in a longitudinal sense) than 

 the anterior one. 



Oedionychis colombiana, sp. n. 



Black, the clypeus and the thorax flavous, the latter impunctate ; 

 elytra with a few punctures near the base, flavous, a broad band at 

 the base, anothei- at the middle, and the extreme apex metallic 

 blue ; abdomen fulvous. 



Length 7 millim. 



Head bluish black, impunctate, frontal elevations small, trans- 

 verse, clypeus flavous, carina short and thick ; antennse with the 

 lower and the terminal three joints dark fulvous, the intermediate 

 ones piceous, third joint much shorter than the fourth ; thorax 

 impunctate, flavous, the sides deeply sulcate, especially so near the 

 anterior angles which are thickened but not produced, near the 

 base is a very shallow transverse sulcation ; scutellum black \ 

 elytra extremely finely punctured, with some more distinct 

 punctvires near the suture and within the shoulders, flavous, a 

 broad transverse band at the base, not extending downwards to 

 the middle nor to the lateral margins, another band immediately 

 below the middle but of more rounded shape, and the extreme 

 apex metallic bkie ; breast and legs black, the abdomen and the 

 tarsi more or less fulvous. 



Hah. Colombia. (Collection H. Clavareau and my own.) 



Closely allied to 0. hipunctata Chev. {insularis Jac), but the 

 head impunctate, the frontal elevations black, not flavous, and the 

 elytra extremely finely punctured, the posterior band broader^ 

 not in shape of a rovind spot. 



OEMOlSrYCHIS succincta, sp. n. 



Black, antennae fulvous ; thorax flavous, with an aeneous short 

 band at the middle of the anterior margin ; elytra flavous, a 

 broad transverse band at the base and another below the middle 

 black, nearly impunctate. 



