286 LAMELLIC0EN1A. 



2. Chrysina amoena. 



S . Pelidnota amcena, Sturm, Cat. 1843, p. 337, t. 3. fig. 2 l . 

 ? . Pelidnota aruginosa, Sturm, loc. cit. t. 3. fig. 1 2 . 

 Chrysina amarna, Burm. Handb. der Ent. I, i. p. 417 3 . 



Hab. Mexico 1 2 3 (Salle, ex coll. Sturm ; exempl. typica), Ciudad in Durango 

 (Edge), Jalapa (Salle), Mineral el Chico (Flohr, in coll. Bates). 



The upper surface in this distinct species is thickly punctured and less shining, the 

 elytra very closely punctured, with finer punctures intermixed, and scarcely any trace 

 of strise. The underside varies in colour, but is much more brilliant than in C. macropus, 

 wholly rich red-coppery, or the abdomen silvery and sometimes dark near the base. In 

 the single female from Ciudad the head, femora, tibise, and pygidium are tawny-vermilion 

 with a metallic tinge. The underside and pygidium are clothed with long hairs, which 

 are denser in the female. The epipleurse in the female taper gradually nearly as in 

 G. macropus, var. adolphi, but without expanded upper margin, and they reach only a 

 little beyond the middle of the elytra instead of nearly to the outer apex. 



Subfam. HETEROSTERNINjE. 



MACROPOIDES. 



Macropoides, Guerin, Rev. Zool. 1844, p. 262 ; Lacordaire, Gen. Col. iii. p. 360. 

 Macropnus, Horn, Proc. Acad. Phil. 1866, p. 397. 



This genus, with Heterostemus and its allies, forms a distinct subfamily (indicated 

 by Horn in defining the genus Macropnus), distinguished from the Rutelinse by the 

 flexuous and fine frontal suture, and from the Areodinse by the form of the clypeus 

 (strongly narrowed from the base and obtusely trapezoidal) and of the mandibles (the 

 outer apical angle bent upwards and prolonged into a tapering and ascendent tooth 

 projecting beyond the margin of the clypeus) ; in repose the ascendent apices of the two 

 mandibles lie parallel and close to each other. The form resembles that of the 

 mandibles in Rutelisca, and is an exaggeration of that usual in Parastasia. The base 

 of the thorax is generally immarginate ; but in this respect Heterostemus is peculiar, 

 the marginal sulcus being deeply impressed except in the middle, where it is faint 

 or interrupted. The males in some of the species have the same enormous develop- 

 ment of the hind legs, with a corresponding protuberant postpectus and inner end of 

 the coxse, as in Chrysina. The major tarsal claw in all the tarsi of both sexes is forked, 

 and the postcoxal process of the prosternum short and triangular, not bent and continued 

 horizontally between the coxae as in Pelidnota and its allies. 



Three species of Macropoides are known, all peculiar to the Mexican and Central- 

 American fauna. 



