512 PHYTOPHAGA. 



are not closed ; it is, therefore, probable that he had several species before him which 

 he regarded as varieties only. The colour of the legs in all the specimens before me is 

 flavous. In regard to the anterior marks of the elytra, the species seems to be subject 

 to great variation. I am not able to satisfactorily separate the numerous specimens 

 from Chiriqui, some of which agree with the type, while others have the anterior 

 ring or the subquadrate mark broken up into spots; these forms seem at first sight 

 to represent distinct species, but the many intermediate degrees where the black 

 marks are partly connected leave no choice but to treat all as belonging to one 

 variable insect. A specimen from Yzabal is figured. 



23. Diabrotica tibialis. (Tab. XXIX. fig. 9.) 



Flavous, the head, breast, and tibiae black ; thorax without fovea?, dark rufous ; elytra very closely and distinctly 

 punctured, a ring-shaped mark at the base connected with a short transverse band, and another slightly 

 curved posterior band, piceous or black. 



Length 3 lines. 



Hab. Mexico, Colima city, Jalapa [Edge), Presidio (Forrer). 



The fourteen specimens before me all showing the same marks of distinction, I am 

 obliged to separate them from D. adelpha. to which the present species is closely 

 allied ; the differences are as follows : — In If. tibialis the thorax is constantly dark 

 reddish-fulvous (not flavous) ; the anterior ring-shaped mark on the elytra is similar 

 to that of I), adelpha, but the posterior band represents a straight line near the 

 suture, which it touches, and the outer end of this band is only slightly curved 

 (never assuming a semilunate shape as in D. adelpha) ; and, lastly, the tibia3 are black. 

 The antennae are of the same structure and colour as in I), adelpha. A single specimen 

 from Presidio is only half the size, but differs in no other way from the Jalapa 

 specimens. 



24. Diabrotica brunneo-signata. 



Testaceous, the head fulvous, the breast and tibiae obscure piceous ; thorax with two small depressions ; elytra, 

 with a transverse band at the base and another at the middle, and an angular spot (widened at the sides) 

 near the apex, fulvous. 



Length 2 lines. 



Head reddish-fulvous at the vertex, nearly black at the lower portion ; antenna? two thirds the length of the 

 body, the third joint very short and not longer than the second and of triangular shape, the fourth slightly 

 curved, the following joints rather elongate and robust, obscure piceous, the three basal joints testaceous • 

 thorax one half broader than long, the surface rather convei, impuuctate, with a very small fovea on each 

 side, pale fulvous; scuteUum fulvous; elytra finely punctured, testaceous, with three transverse fulvous 

 bands (the basal one narrow, the other two triangularly widened at the sides but not quite extending to 

 the lateral margin), the anterior portion of the suture also narrowly fulvous. 



Edb. Panama, Vol can de Chiriqui (Champion). 



A single specimen. This species strongly resembles D. tibialis in the pattern of the 

 elytra ; it differs from that insect, however, in being only about half the size ; in the 



