GTTATEMALICA. — AMITHAO. 359 



white or yellow spots on the lateral segments of the metasternum and the sides of the 

 ventral segments. 



2. Gruatemalica marginicollis. 



Gyrnnetis marginicollis, Burm. Handb. der Ent. iii. p. 266 \ 

 Hob. Mexico 1 (Salle), Almolonga in Vera Cruz (Edge). 



Named G. marginicollis, Burm., in the Salle collection, and agreeing with Bur- 

 meister's description, with the very important exception of the emarginated clypeus, 

 Burmeister saying expressly " kopfschild vorn aufgebogen, nicht ausgebuchtet." It 

 is only on the venturesome supposition that Burmeister's specimen had the head of 

 another species fixed to it that I adopt M. Salle's determination ; one of Herr Hoge's 

 two examples has also a false head glued to it, apparently the head of a Euphoria. 



The chalky-white or yellow markings of the elytra are sometimes separated mostly 

 into spots, viz. (in a female example) one in the middle of the base on each elytron, 

 two on the disc nearly side by side behind the middle, a short marginal streak near 

 the shoulder, another on each side of the scutellum, and a flexuous fascia near the apex 

 extending from the suture to the outer angle. In two male examples the spots (all m 

 the same position) are united in streaks, the scutellar stripe with the basal spot, and 

 the two spots on the disc in an angular band reaching the lateral margin, the subapical 

 fascia remaining the same. In the male the mesothoracic epimera are entirely opaque 

 white, and the naked part of the underside is faintly punctured. Burmeister describes 

 his insect as a male, shining (i. e. glabrous) and rugose beneath, with the hind margins 

 of the ventral segments at the sides grey: this agrees precisely with our female 

 specimen. 



AMITHAO. 



Amithao, Thomson, Typi Cetonid. p. 11 (1878). 

 Cotinis (pars), Burmeister, Handb. der Ent. iii. p. 263. 

 Melasictes, Thomson, Le Naturaliste, i. p. 268 (1880) . 



This genus seems to be sufficiently well-defined by its deep and angularly emargi- 

 nated clypeus, the three more or less spiniform apical teeth of the four hinder tibise, 

 and the horizontal sternal process, generally conical but sometimes more elongate and 

 flattened. The type-species of Thomson (A. lafertei) has, at least in the male, what he 

 terms a tubercle on the head, " 6 caput tuberculatum ;" this no doubt refers to a 

 prominence which marks the abrupt end of what in Cotinis would be a frontal carina 

 or horn, but which in Amithao is scarcely elevated. This structure is more pronounced 

 in another species, A. cavifrons ; but in others it disappears, leaving as a trace of its 

 termination a small pit near the base of the raised edge of the clypeus. There are 

 gradations in this structure from species to species, which are not accompanied by any 



