South American species of Diahrotica. 55 



sunt) ; thorace Isevi, obsolete trifoveolato, rufo-testaceo ; elytris 

 tenuiter subcrebre punctatis, ad latera plicatis, suturse basi et utro- 

 que vitta humerali vix pone medium extensa, nigris. 

 Long. 3 lin. 



Hah. Cayenne. My collection. 



Head triangular ; clypeal ridge ill-defined ; labrum, eyes, and 

 antennte black; these last with the second joint short, the third 

 nearly twice its length, the fourth longer than the preceding two 

 united, the basal joint piceous (the four upper joints in the single 

 specimen before me broken off). Thorax rather broader than long ; 

 sides parallel and sinuate from the base to the middle, slightly 

 rounded anteriorly ; disk convex, impunctate, faintly impressed on 

 the hinder disk with three shallow fovese. Elytra narrowly oblong, 

 dilated posteriorly, convex, faintly impressed transversely below 

 the basilar space, finely and rather closely punctured, strongly 

 plicate on the side below the humeral callus, the subhumeral ridge 

 strongly raised. 



Spec. 97. Diahrotica hrevivittata. 



Subelongato-ovata, postice pauUo ampliata, convexa, flava, 

 nitida, pectore, ore antennisque nigris, his ad basin et ad apicem 

 eordide flavis ; thorace excavato,utrinque obsolete foveolato ; elytris 

 sat crebre punctatis, ad latera plicatis, utroque lineis basalibus 

 brevibus duabus, una communi, altera submarginali, nigris. 



Long. 3 lin. 



Hah. Cayenne. My collection. 



Head not longer than broad, triangular ; labrum and eyes 

 black, the latter large, prominent ; antennce filiform, equal to the 

 body in length, the second joint short, the third one-half longer, 

 the fourth longer than the preceding two united ; the three lower 

 joints, together with the two upper ones, piceo-flavous. Thorax 

 nearly one-third broader than long ; sides rounded anteriorly, 

 sinuate and nearly parallel behind the middle ; upper surface con- 

 vex, hinder disk rather deeply excavated, obsoletely bifoveolate. 

 Elytra narrowly oblong, slightly dilated posteriorly, moderately 

 convex, plicate below the humeral callus, rather closely punctured. 



Closely allied to D. soroensis ; separated by the deeply 

 excavated thorax and by the shorter elytral vitt?e. 



Spec. 98. Diahrotica cavicollis. 

 Subelongato-ovata, postice paullo ampliata, convexa, flava, ni- 

 tida, pectore capitoque nigris, antennis ad basin et ad apicem pallide 



