DIABEOTICA. 



505 



round flavous spot is always indented or emarginate below the shoulder ; the antennae 

 have the second and third joints nearly equal in length, thus differing from B. ele- 

 gantula, the latter having the third joint distinctly longer than the second. The 

 present insect greatly resembles certain forms of B. adelpha, Harold, but may be 

 separated from that species by the nearly straight (not curved) posterior elytral band, 

 this latter in B. adelpha assuming a semilunate shape. The specimens from Cordova 

 agree with those from the State of Panama, except in the want of the thoracic fovese, 

 and in the rather narrower band of the elytra ; it is therefore possible that the Mexican 

 insect represents a closely allied but distinct species. 



* 



8. Diabrotica duvivieri. 



Diabrotica duvivieri, Baly, Trans. Ent. Soc. Loud. 1886, p. 445 \ 



Var. a. Elytra yellow, narrowly margined with black. 



Yar. b. Thorax yellow, the elytra as in var. a, the legs black. 



Hab. Mexico, Teapa 1 , Play a Vicente (Salle). 



Mr. Baly's description of this species was drawn from a single specimen from Teapa, 

 and I have not much doubt that the examples before me from Playa Vicente should 

 be referred to the same insect ; only one of the latter, however, agrees perfectly 

 with the author's description, the others having an extra small yellow spot near the 

 lateral margin of the elytra at the base. The varieties do not differ except in colour ; 

 in several specimens, as in the type, there is an indication of the flavous elytral spots, 

 caused by the shape of the black margins, which seem only inclined to unite at those 

 places where they are joined in the typical forms, thus indicating the elytral pattern of the 

 latter. This variety cannot be mistaken for B. limhella, B ily, which is similarly coloured, 

 on account of the foveolate thorax, the latter in B. limhella being without impressions. 



9. Diabrotica tessellata. (Tab. XXIX. figg. 3, 4.) 



Flavous, the head, the intermediate joints of the antenna?, the breast, tibia?, and tarsi black ; thorax without 

 fovea? ; elytra closely and finely punctured, the suture anteriorly, a spot at the shoulder, and two narrow 

 transverse bands at and below the middle, black. 



Var. The anterior portion of the elybra entirely black. 



Length 2|-4 lines. 



Hab. Panama, Bugaba, Volcan de Chiriqui, David (Champion). 



B. tessellata may possibly be a variety of B. morosa ; but as the eight specimens 

 before me all differ from that species in the same way, I must regard B. tessellata as 

 specifically distinct. The antennae are identical in coloration with those of B. morosa, 

 having the two penultimate joints flavous and the terminal one black. The elytra have 

 the extreme lateral margins and the apices broadly flavous in all the specimens ; but the 

 transverse bands vary in width and the middle one is sometimes connected at the sides 

 with the spots on the basal margin : the figures will, however, give a better idea of their 



biol. centk.-amee., Coleopt., Vol. VI. Pt. 1, June 1887. 3 t 



