306 PHYTOPHAGA. 



the elytra are metallic violaceous without any trace of punctuation. Two specimens 

 from David have the antenna fulvous, but differ in no other way. Lastly, the legs in 

 twenty specimens are black or piceous ; this latter character in connexion with the 

 differently sculptured head will also separate the present insect from D. eximia and 

 D. steinheili, Harold. 



3. Disonycha melanocephala. (Tab. XVIII. fig. 10.) 



Flavous below ; head black ; thorax and legs flavous ; tarsi black ; elytra violaceous or black, impunctate. 



Length 2^ lines. . . 



Head rather flat, impunctate at the vertex, with a row of deep punctures round the inner margin of the eyes ; 

 carina very strongly raised and thickened ; antennae half the length of the body, black, the three basal 

 joints testaceous below, fourth joint a little longer than the third; thorax transverse, of equal width, the 

 sides nearly straight, anterior angles thickened; surface entirely impunctate, flavous ; scutellum black, 

 distinctly broader than long; elytra impunctate, shining, black or dark violaceous. Underside and legs 

 uniformly flavous ; extreme apex of the tibiae and the tarsi black. 



Ilab. Mexico, Tuxtla, Vera Cruz (coll. Salle). 



The head in this species is of a shining jet-black colour ; this in connexion with the 

 flavous underside and legs will help to separate the insect from D. collaris, Fabr., and 

 several other allied species. The impunctate elytra will distinguish it from D. melli- 

 collis, Say. 



4. Disonycha nigripennis. (Tab. XVIII. fig. 9.) 



Elongate, subparallel, flavous; legs f errugineous ; antennae (the three basal joints excepted), parts of the 

 breast, apex of tibiae and the tarsi black ; elytra finely transversely wrinkled, black, shining. 



Length 2|-3 lines. . . 



Vertex of the head more or less piceous, the middle with a fine longitudinal groove ; near the inner margin Ot 

 the eyes a few'deep punctures are placed ; frontal tubercles very obsolete and transverse ; carina thickened 

 and distinct; labrum fulvous; antennae rather robust, the first three basal joints testaceous, more or less 

 stained with piceous above, the rest black ; fourth joint distinctly longer than the third ; thorax flavous, 

 impunctate, the basilar sulcation only indicated at the sides by an obsolete fovea ; scutellum black; elytra 

 finely transversely wrinkled, shining, black. 



Hah. Mexico, Ventanas 2000 feet (Forrer). 



The elongate shape, black and finely rugose elytra separate this species, which is 

 allied to D. collaris, but differs in the colour of the head and the sculpture of the 

 elytra. 



5. Disonycha mexicana. (Tab. XVIII. fig. 8.) 



Ovate, slightly widened behind, flavous or ferruginous ; antennae fuscous or piceous, the first three joints 

 flavous below ; elytra violaceous or blue, entirely impunctate ; apex of the tibiae and the tarsi piceous 

 or black. 



Length 2-2| lines. 



Hah. Mexico, Cordova, Cosamaloapam (Salle), Jalapa (Hbge); Guatemala, Panima, 

 El Reposo (Champion) ; Nicaeagua, Chontales (Janson). 



