144 PHYTOPHAGA. 



Head and clypeus very closely punctured ; antennae longer than half the length of the body, black, three or 

 four basal joints stained with fulvous, the rest gradually thickened and elongate ; thorax transversely 

 convex, the anterior angles acute, the sides subangulate behind the middle, surface very closely and 

 strongly punctured, the interstices here and there, notably at the disk, raised into smooth spaces; 

 scutellum small, narrowly oblong; elytra convex, more strongly punctured than the thorax, the punc- 

 tuation arranged in subregular double rows, the interstices transversely wrinkled and obsoletely 

 longitudinally costate ; underside and legs very dark greenish aeneous. 



Hah. Guatemala, near the city (Salvin), Duenas (Champion). 



The differences between the present species and C. melancholica, to which it is closely 

 allied, consist in the following points :— The antennae in C. balyi are obviously more 

 thickened at the terminal joints, although the latter themselves are not shorter ; the 

 thorax is much more closely punctured, as well as the elytra, which, instead of showing 

 irregular raised spaces, are closely transversely wrinkled, the punctuation at the same 

 time being arranged in double rows ; lastly, the interior of the punctures is not of a 

 different colour from the rest of the surface. C. notaticornis, Lefev., seems to be a 

 closely allied species, but differs in having the last joint of the antennae black as well as 

 the seventh, and in the three-dentate lateral margins of the thorax. Another allied 

 species, C. luridula, Lefev., differs in the punctuation of the thorax and the elytra. 



20. Colaspis laticollis. (Tab. VII. fig. 6.) 



Dark violaceous blue ; antennae (the last three joints excepted) and legs fulvous ; tarsi black ; thorax obsoletely 

 angulate at the sides, strongly punctured. 



$ . Narrowly oblong, convex ; antennae as long as the body. 



2 . Larger, greatly widened posteriorly ; antennae shorter. 



Head more or less strongly punctured at the vertex ; palpi fulvous, the apical joint thickened, black ; antennae 

 as long as the body, fulvous, the last three joints black ; thorax rather broad, scarcely narrowed in front, 

 the sides rounded, very obsoletely angulate behind the middle, surface moderately closely covered with 

 oblong deep punctures; elytra distinctly and deeply transversely depressed below the base, the latter 

 raised, closely punctate-striate, like the thorax of metallic dark-blue colour; legs fulvous; tarsi black, 

 the anterior ones dilated in the male. 



$ . Thorax and elytra less closely and strongly punctured, the latter greatly dilated ; thorax more narrowed 

 towards the apex. 



Rah. Mexico, Juquila, Cordova, Panistlahuca, Jalapa (SallS, JBoueard, Edge) ; Gua- 

 temala, Zapote, El Eeposo (Champion) ; Nicaragua, Chontales (Belt). 



The differences in shape, and in some respect in sculpturing, between the sexes of 

 the present species are very great, the female being of a much larger size and much 

 more convex and gibbous than the male. M. Lefevre has described a variety of his 

 C. impressa which seems to agree to some extent with the present insect ; but the tarsi 

 in the latter and the last three joints of the antennae are deep black in all the specimens 

 before me, not " nigro-infuscatis," and the punctures of the elytra are not aciculate, but 

 simple. The above variety has also been described from Rio Janeiro. A specimen 

 from Cordova is figured. 



