CEEOTOMA. 617 



of Panama, where it appears to be replaced by the very closely allied G. salvini. The 

 numerous authors quoted above were evidently not acquainted with the many colour- 

 varieties of this species ; the black transverse bands of the elytra are sometimes partially 

 or wholly absent, the elytra being in such cases entirely fulvous or yellow, with the 

 exception of the narrow black basal margin ; an opposite extreme of coloration, however, 

 occurs in which the elytra are entirely black, with the exception of the narrow fulvous 

 lateral margin ; between these two forms all kinds of intermediate degrees are to be 

 found, but in nearly every instance the small black sutural spot placed near the apex 

 of each elytron is present. The colour of the legs is equally variable. The male of 

 G. ruficornis is distinguished by the dilated and deformed third joint of the antenna?. 

 The variety from Porto Rico, figured by Weise 2 , is also found in Mexico. C. atro- 

 fasciata, Jac. 7 , is only one of the numerous varieties with nearly unicolorous elytra. 



2. Cerotoma salvini. (Tab. XXXIV. fig. 18.) 



Cerotoma salvinii, Baly, Trans, Ent. Soc. Lond. 1866, p. 478 \ 



Hab, Panama (Salvin 1 , Boucard), Bugaba, Volcan de Chiriqui, Caldera, Tole 

 (Champion). 



C. salvini, an insect only known as yet from the State of Panama, might easily be 

 mistaken for G. ruficornis, to some of the varieties of which it closely approaches in the 

 pattern of the elytra. The structure of the head of the male of G. salvini is, however, 

 different from that of G ruficornis : in the latter the clypeus is shaped like a transverse 

 ridge, and has three projecting points (one on each side and one in the middle) ; in the 

 former this ridge is absent, and at each side of the clypeus a strong spine, curved 

 upwards, is placed— by this character the male may be at once separated from that of 

 the allied species. I know, however, no character by which to distinguish the female 

 of C. salvini, unless the pattern of the elytra (that is of the typical form) is taken as 

 such : typical examples may be described as having black elytra, with a rounded spot 

 at the base, a narrow transverse band at the middle, and a short oblique band near the 

 apex, as well as the extreme lateral margins of each, flavous. The legs seem always to 

 be entirely flavous ; in G. ruficornis the posterior femora are usually black at the apex. 

 The antennas in G. salvini do not differ in structure from those of G ruficornis. 



3. Cerotoma dilatipes. (Tab. XXXIV. fig. 19.) 



Flavous, the breast black, the tibiae obscure fuscous ; thorax impunetate ; elytra very closely punctured, each 

 with a narrow transverse band before the middle, connected by a stripe with the shoulder, a A-shaped 

 band below the middle, and a small spot at the apex, black. 



<$ . The anterior tibiae and the first joint of the anterior tarsi strongly dilated. 



Var. Head black, the thorax reddish-fulvous. . 



Length 2^-3 lines. 



Head black at the extreme vertex, impunetate, the lower part of the face and the clypeus forming a nearly 

 flat surface ; antennae slender, flavous, the third joint as long as the first and second joints together ; thorax 



biol. cente.-amee., Coleopt., Vol. VI. Pt. 1, February 1888. 4 k 



