CANTHON. 29 



€. quadriguttatus, C. subhyalinus, &c, but shorter in outline than in the larger species 

 of the group, and showing only a slight narrowing behind. In the feeble carinae and 

 absence of groove along the outer edge of the posterior tibiae it agrees with C. sub- 

 hyalinus, C. quadriguttatus (Oliv.), and C. femoralis. The clypeus has two sharp 

 triangular approximate teeth, and is rounded on each side immediately from the base 

 of the tooth, showing a slight but sharp projection at the suture of the genae. There is 

 a strong sutural depression at the base of the elytra, which does not extend to the thorax. 

 Immature specimens are glossy pale castaneous. 



9. Canthon lamprimus. (Tab. II. fig. 8.) 



Breviter ovatus, supra (praecipue thorace) convexus, politissimus, nigro-cyaneus vel cuprous, pedibus rufo- 



testaceis ; clypeo bidentato ; thorace medio utrinque angulato et antice valde arcuato denticulatoque ; 



elytris vix perspicue striatis ; tibiis 4 posticis subcompressis, extus arcuatis, acute bicariuatis, et inter 



carinas sulcatis ; prosterno transversim carinato ; pygidio sericeo. 

 3 . Tibiae anticae latse, dentibus 2 inferioribus approximatis, 3° superiore distanti et multo minore, calcare apicali 



lato, apice augulariter emarginato. 

 Long. 5-5|- millim. 



Hab. Panama, Tole, San Miguel in the Pearl Islands (Champion). 



Allied to C. euryscelis, but more glossy and metallic, and hind tibiae distinctly less 

 dilated. A further distinguishing character lies in the anterior tibiae, in which the 

 upper tooth is small and distant from the two lower ones, whilst in C. euryscelis all three 

 are large and equally close together. The clypeus is not so evenly rounded on each 

 side from the base of the teeth, but is flexuous, and the sharp denticle at the lateral 

 suture is more prominent. The angular dilatation on the side of the thorax is unusually 

 sharp, and the vertical arcuation of the side in front of the angle very highly developed ; 

 the hind angles of the thorax are prominent and acute. The base of the elytral suture 

 is depressed, and the humeral callus free from traces of striae. 



Four examples. The single specimen from Tole is brilliant red-coppery, the others 

 bluish-black ; the former is figured. 



10. Canthon caelius. 



O. lamprimo proxime affinis, forsan ejus varietas, sed differt elytris subopacis nigro-cyaneis distincte striatis ; 



eapite thoraceque aeneo-cyaneis politissimis, subtilissime punctulatis ; pedibus piceo-rufis, femoribus 



metallicis ; pygidio sericeo punctulato ; caetera sicut in C. lamjprimo. 

 Long. 5 1 millim. 



Hab. Panama, David (Champion). 



The outline and dentition of the clypeus are exactly as in C. euryscelis, and also as in 

 the common North-American C. viridis, from which the straight and simple inner edge 

 of the anterior tibiae amply distinguish both the similar Panama species. The form of 

 the thorax is also the same as in C. lamprimus, but the surface is finely punctulated, 

 whilst under the same power that of C. lamprimus appears perfectly smooth ; the elytra 



