250 ME. J. S. BALY ON THE COLOMBIAX 



tenuiter punctatis, utrisque plaga infra basin alteraque pone medium, 

 nigris. Long. 2| lin. 



Mas. Antennarum articulis tertio ad sextum difformibus. 



Hab. Magdalena River : my collection. Eastern Colombia 

 {Winkler): coll. Steiubeil. 



Head not longer than broad, triangulai", front with a longitu- 

 dinal groove ; clypeus with a faint longitudinal ridge. Antennae 

 with the second joint short, submoniliform, the third to the sixth 

 thickened, the third equal in length to the first, clavate, its apex 

 obliquely truncate, the fourth and fifth shorter, trigonate, equal, 

 the sixth nearly equal in length to the third, clavate. Thorax 

 twice as broad as loiigj sides slightly rounded, obliquely diver- 

 ging from the base to the middle ; transversely convex, slightly 

 flattened on the disk ; hinder disk with a shallow ill-defined trans- 

 verse excavation. Elytra much broader than the thorax, convex, 

 the outer limb narrowly dilated ; surface finely but not closely 

 punctured. 



This species in general form closely resembles D, rohusta. 



89. DiABROTiCA iNSiGNiTA. Late ovata, postice pauUo ampliata, 

 convexa, nigra, nitida ; thorace transverse, Isevi, utrinque leviter 

 foveolato, rufo-testaceo ; antennis apice elytrisque flavo-albidis ; his 

 tenuiter punctatis, fasciis duabus, prima a basi ad quartam partem 

 elytri longitudinis extensa, altera vix pone medium, extrorsum 

 abbreviata, nigris, ornatis. Long. 2 lin. 



Hah. Muzo; Medellin, Eastern Colombia {Winkler). 



Head longer than broad, wedge-shaped ; vertex shining, im- 

 punctate ; encarpae thickened, contiguous ; carina raised, linear, 

 well defined; antennae filiform, the third joint nearly twice the 

 length of the second, four fifths the length of the fourth, the 

 ninth and tenth, together with the lower half of the eleventh, 

 obscure white, the rest black. Thorax more than half as broad 

 again as long ; sides straight and parallel from the base to beyond 

 the middle, thence converging to the apex ; disk smooth, im- 

 pressed on either side with a large and shallow fovea ; at the base, 

 just in front of the scutellum, is a third, much smaller than the 

 others. Elytra broader than the thorax, oblong-ovate, slightly 

 dilated towards the apex ; convex, finely but not very closely 

 punctured. 



Subsection 2. Thorax pale with dark markings. 



90. DiABKOTiCA Chevkobati, V. Harold, Coleo'pt. Hefte, xiii. 

 1875, p. 93. 



