CHTHONEIS— MIEACES. 611 



the elytra vary in colour from dark blue to violet and green, and are finely rugosely 

 punctured. 



C. jansoni has been found in abundance by Mr. Champion in the vicinity of the coffee- 

 plantations on the slope of the Volcan de Chiriqui, at an elevation of 3000 feet. 



2. Chthoneis dilaticornis. (Tab. xxxin. fig. 24, <r.) 



Black ; thorax flavous, impunctate ; elytra dark violaceous, closely semirugose-punetate. 



J . Antennae as long as the body, the intermediate joints dilated, the fifth and sixth joints deformed. 



Length 3 lines. 



J . Narrowly elongate ; the head black, shining, impunctate ; the frontal tubercles distinct, trigonate ; antennas 

 black, the second and third joints very short and equal, the fifth and sixth joints elongate, hollowed at the 

 middle, the former thickened at the base and the latter at the apex, the following joints irregularly 

 flattened, the apical one terminating in an acute hook-like point ; thorax narrowly transverse, the sides 

 but little rounded, the surface impunctate, flavous, shining ; elytra dark violaceous, closely punctured and 

 semi-rugose ; legs black. 



Eab. Guatemala, Cerro Zunil (Champion). 

 The female has shorter and simple antennae. 



MIEACES. 



Oblong ovate ; antennae subfiliform, the apical joints gradually thickened; thorax transverse, the disc trans- 

 versely grooved, the sides and the posterior margin rounded ; elytral epipleurae broad at the base, obsolete 

 below the middle ; legs rather robust ; the tibiae unarmed ; the first joint of the posterior tarsi as long as 

 the following two joints together ; claws appendiculate ; the anterior coxal cavities open. 



I propose the present genus for the reception of a small insect, which is principally 

 distinguished from the allied forms by the distinct transverse groove (extending across 

 the middle of the disc) of the thorax in connection with the unarmed tibiae and rather 

 stout antennae. The single species I refer to it inhabits Guatemala and British 

 Honduras. 



l. Miraces seneipennis. (Tab. xxxiv. fig. 16.) 



Piceous below ; the head, antennae, thorax, and legs fulvous ; thorax impunctate ; elytra dark metallic greenish 

 or purplish, very finely punctured and granulate. 



Length 1-1 1 line. 



Head obscure seneous or piceous at the vertex, fulvous at the lower portion, the latter rather swollen and 

 impunctate ; eyes large ; the frontal tubercles trigonate ; the clypeus in the shape of a narrow transverse 

 ridge ; antennae scarcely half the length of the body, fulvous, all the joints of nearly the same length, the 

 third joint scarcely longer than the second, the terminal joints gradually and slightly thickened ; thorax 

 nearly three times broader than long, the sides rounded and slightly widened at the middle, the anterior 

 margin concave, and parallel with the posterior margin, the surface with a very distinct transverse groove 

 at the middle of the disc, the groove extending nearly to the sides, impunctate, fulvous ; scutellum 

 piceous or black ; elytra metallic green or aeneous, slightly widened posteriorly, with an almost obsolete 

 transverse depression below the base, very minutely granulate and finely punctured; legs fulvous; under- 

 side piceous or obscure fulvous. 



Hab. British Honduras, E. Hondo (Blancaneaux) ; Guatemala, Capetillo, San 



Geronimo (Champion). 



4i2 



