526 - PHYTQPHAGA. 



k. Elytra entirely pale flavous or greenish. 



55. Diabrotica obscura. 



Ovate, widened behind ; obscure greenish-flavous, the head, antennae (the basal joints excepted), breast, tibiae, 

 and tarsi black ; thorax bifoveolate ; elytra scarcely visibly punctured ; abdomen flavous. 



Yar. a. The underside and legs black, the base of the femora flavous. 



Var. h. Beneath pale flavous, above greenish. 



Length 2|— 3 lines. 



Head impunctate, black ; antennae extending to about half the length of the elytra, fuscous or black, the 

 three basal joints flavous, the third one half longer than the second (but much shorter than the fourth) 

 joint ; thorax about one half broader than long, the disc impunctate, with a small fovea on each side; 

 elytra rather flattened and widened posteriorly, very closely and finely punctured. 



Hob. Mexico, Etla, La Parada, Yolos, Totosinapan (Salle), Oaxaca (JBoucard). 



D. obscura may be recognized by the rather ovate and flattened shape and the 

 uniform pale flavous or greenish upper surface. If I refer rightly all the specimens to 

 one species', the underside and legs vary in coloration : in the specimens with the 

 underside dark the bases of the femora are always more or less flavous ; in those with 

 pale breast and abdomen the legs are greenish. D. melanopa, Erichs., differs in the 

 non-foveolate thorax and the more strongly punctured elytra. 



56. Diabrotica olivieri. 



Flavous, the head, the intermediate joints of the antennae, the tibiae, and tarsi black ; thorax depressed on the 

 disc ; elytra finely and very closely punctured. 



Length 3 lines. 



Head impunctate, with the usual fovea, black ; antennae with the three lower and the three apical joints pale 

 testaceous, the intermediate joints and the apex of the terminal one dark, the third but slightly longer 

 than the short second joint; thorax slightly broader than long, not visibly punctured, the surface flat- 

 tened, with a more or less deep fovea on each side ; elytra closely punctured. 



Bab. Mexico, Cordova (Salle); Beitish Honduras, E. Hondo (Blancaneaux) ; 

 Nicaragua, Chontales (Janson). 



I cannot refer this insect to any described species, on account of the unicolorous 

 upper- and under-sides and the black head, tibise, and intermediate joints of the 

 antennae. In the single Mexican specimen the thorax is of a more fulvous colour and 

 its disc is more deeply foveolate ; in the one from British Honduras the apices of the 

 elytra have an obscure piceous spot. Other differences I am unable to find. 



1. Elytra green, with flavous or fulvous markings. 



57. Diabrotica porracea. (Tab. xxix. figg. 17, 18.) 



Diabrotica porrace*, Harold, Coleopt. Hefte, xiii. p. 93 (1875) l ; Dej. Cat. 3rd ed. p. 404 2 . 

 Diabrotica costatiptnnis, Jac. P. Z. S. 1878, p. 996 3 . 



Hob. Mexico 12 , Monclova in Coahuila, Ciudad in Durango, Ventanas (Forrer), 



