224 ME. J. S. BALT ON THE COLOMBIAN 



united. Thorax subquadrate ; sides rather broadly margined, 

 parallel and obsoletely sinuate from the base to beyond the 

 middle, thence slightly and obliquely couA^erging to the apex ; 

 surface impunctate, middle disk flattened, impressed on either 

 side with a deep fovea. Elytra broader than the thorax, oblong- 

 ovate, slightly dilated posteriorly, convex, closely rugose-punctate ; 

 each elytron with four or five indistinctly raised longitudinal 

 costse. 



26. DiABROTicA INCONSTANS. Anguste oblongo-ovata, postlce pauUo 

 ampliata, prasina, nitlda ; scutello, tibiis tai'sisque piceis ; ore nigro ; 

 antennis piceo-fulvis extrorsum infuscatis; thorace Isevi, bifoveolato ; 

 elytris sat crebre et fortiter punctatis, obsolete longitudinaliter sul- 

 catis ; plagis suffusis duabus, una infra basin, altera pone medium, 

 flavis, plus miuusve piceo maculatis. Long. 2^ lin. 



Hah. Manizales, Ubaque ; Oceana {Landolf) ; Magdalena 

 E,iver ; also Nicaragua and Mexico- 

 Head not longer than broad, triangular ; antennae filiform, the 

 second and third joints short, nearly equal, the latter being only 

 slightly longer than the former ; fourth much longer than the two 

 united. Thorax one half broader than long ; sides nearly straight 

 and parallel from the base to just beyond the middle, thence 

 obliquely converging to the apex ; upper surface minutely and 

 remotely punctured ; disk bifoveolate. Elytra oblong, slightly 

 dilated posteriorly, convex, strongly punctured ; disk of each 

 elytron with four or five broad shallow longitudinal sulca- 

 tions, the outer one more deeply excavated than the rest ; the 

 flavous patches are ill-defined and vary greatly in extent, some- 

 times covering nearly the whole surface of the diskj in some 

 specimens also the outer limb is edged with flavous ; the piceous 

 markings vary equally with the patches themselves, sometimes 

 being entirely obsolete. 



Very closely allied to D. porracea, Harold ; possibly a local 

 form of that species. 



27. DiABROTiCA ORNATULA. Elongata, pallide prasina, pectore anten- 

 nisque (harum articulo basali exeepto) pallide piceis, femoribus posticis 

 basi, metasterno abdomineque flavis ; thorace Isevi, tenuiter punctate, 

 bifoveolato ; elytris crebre punctatis, elevato-vittatis, basi pustulaque 

 subapicali flavis; fascia basali extrorsum abbreviata, et utrinque 

 maculis duabus transversis, una prope medium, alteraque super 

 pustulam flavam positis, piceis aut rufo-piceis. Long. 2^ lin. 



Var. A. Elytrorum maculis plus minusve obsoletis. 



