508 PHYTOPHAGA. 



eighth and the apical one black ; thorax flavous, impnnctate, the disc obsoletely flattened ; elytra very 

 finely punctured, the first band consisting of two subtriangular spots which are united at the middle, the 

 second and third bands not quite extending to either margin, the posterior edge of the terminal fascia 

 rather strongly concave. 



Hab. British Honduras, R. Hondo, R. Sarstoon (Blancaneaux) ; Guatemala, San 

 Geronimo, Tocoy, El Jicaro (Champion); Nicaragua, Granada (Salle), Chontales 

 (Janson); Panama, Bugaba, Volcan de Chiriqui, David, Caldera, Tole (Champion). 



D. signifera, although closely allied to D. albo-signata and D. paradoxa, differs in 

 the extremely short second and third joints of the antennae, these joints being monili- 

 foxm in shape in the male ; and in the differently shaped elytral bands, the basal one 

 being often interrupted by a flavous triangular spot of variable size at the middle, 

 this spot dividing the band itself into two black triangular markings which only 

 touch in the centre ; in one or two examples the anterior band is replaced by 

 isolated spots, and in some others from British Honduras the black bands are greatly 

 widened, thus reducing the pale intervals of the ground-colour to very narrow spaces. 

 The pygidium in all the specimens is black. D. albo-signata differs further by the 

 black apices of the elytra and larger general size. Many specimens. 



15. Diabrotica dorso-vittata. 



Testaceous, the antennae (the basal joint excepted), tibiae, and tarsi black ; thorax with a discoidal depression ; 



elytra minutely punctured, with a transverse band before and another below the middle, and the extreme 



apices, black. 

 Length 2 lines. 

 Head testaceous or fulvous, the frontal tubercles very obsolete ; antennae two thirds the length of the body, 



black, the basal joint sometimes fulvous, the second and third joints equal and together shorter than 



the fourth joint; thorax one half broader than long, entirely impunctate, the disc shallowly depressed; 



elytra parallel, very minutely punctured, each with two transverse black bands (the first a little below the 



base, nearly straight, the second some distance below the middle, rather broader, and slightly curved 



at its posterior margin), the extreme apices also black. 



Hab. Guatemala, Panzos, Teleman, Chacoj, and San Juan in Vera Paz (Champion). 



JD. dorso-vittata may be at once known amongst its allies by the elytra having only 

 two (instead of three) bands, and also by the position of these latter; as well as by the 

 uniform colour of the head, thorax, and underside, the breast not being black in this 

 insect. In some specimens the anterior elytral band is much broader, extending 

 upwards towards the base and connected at the sides with the second band; other 

 differences I am not able to find. 



16. Diabrotica tripartita. 



Fulvous, the head black; thorax bifoveolate; elytra with the anterior half and a broad band below the 

 middle black. 



Length 2 lines. 



Head black, impunctate ; antennas nearly as long as the body, the second and third joints very small, the fourth 

 longer than the preceding three together, the three or four intermediate joints and the apical one black, 

 the others pale flavous; thorax one half broader than long, the disc with two foveas, impunctate; elytra 



