South American siiecies of Diahrotica. 51 



fourths the length of the body, the second joint short, the third 

 very slightly longer than the second, the fourth longer than the 

 preceding two united. Thorax slightly broader than long ; sides 

 nearly parallel and sinuate from the base to the middle, thence 

 rounded and converging towards the apex, the hinder angle 

 slightly produced, acute ; disk convex, impunctate. Elytra ovate, 

 dilated posteriorly ; upper surface rather strongly convex, closely 

 punctured, distinctly plicate below the humeral callus, the sub- 

 humeral costa well-defined and extending to the middle of the 

 elytron. 



Spec. 90. Diahrotica in'oximans. 



Anguste ovata, postice pauUo ampliata, convexa, flava, nitida, 

 pectore, scutello capiteque, antennis ad basin et ante apicem ex- 

 ceptis, nigris ; thorace convexo, Isevi; elytris sat crebre punctatis, 

 utroque vittis duabus basalibus brevibus, una humerali, altera 

 suturali communi maculaque sublaterali pone medium, nigris. 



Long. 3 lin. 



Hah. Upper Amazons. My collection. 



Head triangular, not longer than broad ; clypeal ridge well- 

 defined ; antennae filiform, nearly equal to the body in length, the 

 second joint short, moniliform, the third slightly longer, the fourth 

 much longer than the preceding two united, the fifth to the eighth, 

 together with the eleventh, black or piceous, the rest flavous. 

 Thorax about one-third broader than long ; sides parallel and very 

 slightly sinuate from the base to beyond the middle, thence rounded 

 and converging towards the apex, the anterior angles slightly pro- 

 duced, obtuse ; disk convex, impunctate. Elytra ovate, slightly 

 dilated posteriorly, convex, faintly grooved longitudinally below 

 the humeral callus, rather closely punctm-ed ; the basal vitta 

 wedge-shaped, scarcely extending for more than one-fourth the 

 length of the elytra. 



The black head, the less strong subhumeral plication 

 of the elytra, together with the short basal vittte and 

 the absence of the inner post-medial spot, will separate 

 this species from the preceding. 



Spec. 91. Diahrotica hrevicornis. 

 Subelongata, postice paullo ampliata, convexa, pallide flava, 

 nitida, pectore capiteque nigris, antennis nigro-piceis ad basin et ad 

 apicem pallidis ; thorace Isevi, disco postico leviter deplanato ; scu- 

 tello piceo ; elytris crebre punctatis, ad latera distincte plicatis ; utro- 

 que vittis brevibus basalibus duabus, una communi, altera humerali, 

 maculaque sublaterali oblonga, pone medium posita, nigris. 

 Long. 3 lin. 



E 2 



