South American species of Diahrotica. 31 



Var. A. Antennis flavis, caeteris ut in typo. 



Var. B. Elytro utroque plagis magnis duabiis, una basali, com- 

 muui, utrinqne punctum parvum flavum plerumque includenti al- 

 teraque pone medium, postice plerumque emarginata, nigro-ciEruleis. 



Var. C. Elytrorum annulo basali, postice interrupto vittulisque 

 duabus pone medium ti'ansversim positis, nigro-cseruleis. 



Long. 3 lin. 



Hah. Colombia ityi^f^) ', two specimens in my own 

 collection. Central America {ti/pe and varieties). In 

 most collections. 



Head shining black ; longitudinal ridge on clypeus well-defined ; 

 antennae filiform, the third joint distinctly longer than the second, 

 the fourth longer than the preceding two united. Thorax nearly 

 one-fourth broader than long ; sides diverging and siniiate from the 

 base to the middle, slightly produced and rounded anteriorly, 

 thence slightly converging towards the apex ; upper surface smooth, 

 impunctate, hinder disk flattened or slightly excavated, impressed 

 with three shallow foveae, one on either side about the middle, the 

 third less distinctly defined than the others and often obsolete, 

 placed immediately in front of the basal margin. Elytra oblong, 

 slightly dilated posteriorly, minutely punctured. 



The present species is so closely similar in colour and 

 variation of pattern to D. pulchella and adelpha, Harold, 

 that without close attention to the sculpturing of the 

 thorax it is quite impossible to separate them. In 

 C. hianmdaris the hinder portion of the middle disk is 

 more or less distinctly excavated, the excavated surface 

 being impressed with three shallow foveas, placed in a 

 triangle, the hinder one sometimes obsolete ; this exca- 

 vation varies greatly in depth, and in some few cases 

 almost entirely disappears, in some specimens the 

 hinder disk being simply flattened, but never, in any 

 of the specimens that I have examined, convex ; in the 

 two allied species the disk is regularly convex, its 

 surface being bifoveolate in C. pidchella, W'hilst in 

 C. adelpJia the fovese are obsolete. 



Spec. 50. Diahrotica pulchella, Jacq. Duval. 



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

 capiteque, antennis ad basin et ad apicem exceptis, nigris ; thorace 

 bifoveolato ; elytris tenuissime punctatis, utroque annulo basali 

 alteroque pone medium, hoc plerumque lacerato, cyaneis. 



