DIABEOTICA. 517 



it is piceous or dark fulvous, while Olivier gives it as black. Some specimens agree 

 perfectly with the figure in Olivier's work ; but there are examples before me in which 

 the elytra have the anterior portion piceous, this colour surrounding a yellow spot at 

 the base, and a narrow transverse band below the middle dark navous. This variety 

 greatly resembles I), adelpha and several other allied species; between this form, 

 however, and normally coloured specimens several intermediate stages are before me, 

 thus proving the species to be, like so many of its congeners, a very variable one. Our 

 figure differs from that given by Olivier 2 in having larger navous spots on the elytra ; 

 but the name tripunctata is misleading, as there are only two spots on each elytron, 

 and these spots can scarcely be said to resemble small punctures. 



Diabrotica flaviventris. (Tab. xxix. fig. 20.) 



Head and breast black, the basal and apical joints of the antennae flavous ; thorax piceous, without foveas ; 

 elytra closely punctured, fulvous, the anterior half and a transverse band below the middle piceous ; tibiae 

 and abdomen navous. 



Var. Elytra almost entirely piceous, the apices more or less fulvous. 



Length 3 lines. 



Head impunctate ; the second and third joints of the antennae very short, equal in length, the three lower joints 

 flavous, the five following ones more or less fuscous, the ninth and tenth joints flavous, the apical one 

 fuscous ; thorax dark fulvous or piceous, rather convex, the disc without depressions and with a few fine 

 punctures ; elytra with a distinct margin, slightly widened behind, closely and distinctly punctured. 



Eab. Mexico, Cosamaloapam, Tlacotalpam (Salle), Vera Cruz, San Juan Bautista 

 Acapulco, Tapachula (Edge) ; Guatemala, Panzos, Teleman, Chacoj (Champion). 



The description is drawn from a single well-marked specimen, in which the elytra 

 have the anterior half nearly black, the rest dark fulvous, with a transverse curved 

 black band below the middle extending to the suture but not to the lateral margin ; 

 in all the other specimens the fulvous portion is almost entirely invisible, or only 

 slightly indicated, owing probably to discoloration after death. The femora and the 

 abdomen are flavous, the tibiae and tarsi black. The specimen figured is' of a more 

 fulvous hue than the others, and was at first supposed by me to represent a distinct 

 species. The specimen from Tlacotalpam is figured. 



35. Diabrotica fulvo-signata. (Tab. xxix. fig. 12.) 



Diabrotica fulvo-signata, Baly, Ann. & Mag. Nat. Hist. 5th ser. iii. p. 77 (1879) \ 



Eab. Guatemala 1 ; Nicakagua, Chontales (Janson) ; Panama, Bugaba (Champion). 



An example from Bugaba is figured. 



36. Diabrotica tricolor. (Tab. XXXI. fig. 16.) 



Ovate, slightly widened posteriorly; black, the antennae obscure fulvous; thorax without foveae; elytra 



minutely punctured, the base black, the middle fulvous, the apices navous ; abdomen navous. 

 Length 2 lines. 



