244 MB. J. S. BALT ON THE COLOMBIAN 



oblique fovea. Scutellum piceo-flavous. Elytra oblong, slightly- 

 dilated posteriorly, convex, slightly depressed below the basilar 

 space, distinctly punctured; on each is a sublateral piceous 

 costa, which commences on the humeral callus and terminates 

 abruptly at a short distance before reaching the apex of the 

 elytron ; the costa itself is entire, but the piceous coloration is 

 interrupted for a short space below^ the humeral callus ; on the 

 middle third of the inner disk is a narrow piceous line ; imme- 

 diately below the scutellum is also a small pale piceous spot. 



L. Body ovate, dilated posteriorly, convex ; elytra closely and 



irregularly punctured ; piceous, with flavous vittse. 

 67 . DiABROTiCA ALTERNATA. Ovata^ postice paullo dilatata, convexa, 

 nigra, nitida ; pedibus flavis ; genubus, scutello, ore antennisque piceis, 

 harum articulis sexto, septitno undecimoque fuscis, octavo, none deci- 

 moque albidis ; thoi'ace transverse, subr emote punctate, disco bifo- 

 veolato, medio longitudinaliter sulcato; elytris fortiter subcrebre 

 punctatis, punctis prope suturam subseriatim dispositis; utrisque 

 limbo vittaqiie discoidali a basi fere ad apicem extensa, flavis. Long. 

 2f Un. 

 Hah. Magdalena Eiver. 



Head longer than broad, triangular; vertex smooth, nigro- 

 pieeous; clypeus rugose, clothed with adpressed silky hairs; 

 antennae filiform, the second joint short, the third nearly twice 

 as long as the second, equal in length to tiie fourth. Thorax nearly 

 twice as broad as long ; sides straight and parallel from the base 

 to beyond the middle, then converging towards the apex ; apical 

 border, together with the upper portion of the lateral margin, 

 narrowly edged with piceous ; upper surface transversely convex ; 

 disk impressed on either side with a large oblique shallow and 

 ill-defined fovea ; medial line behind the middle with a shallow 

 longitudinal depression ; surface distinctly, but rather distantly, 

 punctured. Elytra convex, strongly punctured. 



M. Elytra ovate, dilated posteriorly, strongly convex, their 



apices obtuse or obtusely rounded ; subseriate or irregularly 



punctured, the hinder disk often faintly elevate-vittate ; 



lower face in the male (in the majority of the species) deeply 



excavated. 



68. DiABROTiCA BE ATA. Ovata, postice ampliata, valde convexa, 



nigra, nitida; pedibus antennisque flavis, his apice nigro-piceis ; 



thorace laevi, remote tenuiter punctate, disco utrinque fovea obliqua 



profunde impresso ; . elytris late oblengis, apicem versus paullo am- 



