358 PHYTOPHAGA. 



America— the only one known to inhabit North America, being either identical 

 with, or so closely allied to, one from Mexico, that I have at present been unable to 

 separate the latter from its more northern representative. In general shape Bibolia 

 much resembles the genus Psylliodes. 



1. Dibolia borealis. (Tab. XXI. fig. 10.) 



Bibolia borealis, Chevr. Guer. Icon. Regne Anim. 1845, p. 307 \ 



Dibolia area, Melsb. Proc. Acad. Phil. iii. 1846, p. 167 2 ; Crotch, Proc. Acad. Phil. 1873, p. 67 3 . 



Dibolia ovata, Lee. Proc. Acad. Phil. 1859, p. 286 \ 



Hob. Noeth Ameeica 1234 .— Mexico, Las Vigas (Ebge), Orizaba (Salle), Ciudad in 

 Durango, Ventanas (Forrer). 



Between the specimens obtained by Mr. Forrer and those by Herr Hoge, there is a 

 slight but constant difference to be seen, which I attribute at present to local influence, 

 although it is quite possible that the two forms are specifically distinct. All the speci- 

 mens from Las Vigas differ in having the elytral punctured striae much less distinct 

 than is the case in the specimens from other localities. The legs and tibiae are also 

 nearly black, the latter being fulvous in the examples from Ventanas (which agrees 

 with the description of Leconte and the other American authors) ; the elytral striae in 

 these specimens are very distinct, and the interstices are closely and finely punctured 

 (these striae are scarcely visible in some of the specimens from Las Vigas). I cannot 

 find, however, any other difference of importance ; the general colour of all the insects 

 before me varies from metallic green to blue and dark coppery or obscure aeneous; 

 sometimes the first three or four joints of the antennae are fulvous. Although I have 

 never seen typical specimens from North America, I have not much doubt that I refer 

 the species rightly to D. borealis, with the description of which the Mexican specimens 

 agree entirely. 



2. Dibolia championi. 



Below pieeous ; head and thorax dark fulvous ; elytra violaceous-blue, punctate-striate, the interstices 

 impunctate. 



Head with a few scarcely visible punctures ; antennas black, the second and third joints short and equal; 

 thorax transverse, very finely and closely punctured, obscure fulvous like the head; elytra rather regularly 

 but finely punctate-striate. 

 Hah. Guatemala, San Juan in Vera Paz (Champion). 



This species is certainly very closely allied to the preceding, but differs in the colour 

 of the antennae, head, and thorax, and also in having the interstices of the elytra im- 

 punctate. It is quite possible that the fulvous colour of the thorax is but the result 

 of immaturity ; but as only a single specimen is before me, I cannot be sure about 

 this* 



