CANTHON. 31 



black variety in various Mexican localities. In all the varieties the elytra are less 

 bright than the head and thorax, as Harold expresses it " nitidulus, elytris minus 

 nitidis." The following form, in which the elytra are highly polished throughout, is # 

 doubtless, therefore, different, although exhibiting the same peculiar shape of the anterior 

 tibiae. 



13. Canthon championi. 



€. viridi proxime afflnis, major, undique politissimus, viridi-cyaneus ; capite laevi, clypeo bidentato et utrinque 

 flexuoso, genarum angulo acuto ; thorace subtilissime punctulato vel laevi, lateribus ante medium valde 

 angulatis et antice arcuatis haud denticulatis ; elytris vix striatis ; prosterno transversim carinato ; tibiis 

 anticis intus ante medium subito et valde dilatatis, apice recte truncatis, extus dente superiore minore et 

 remoto ; tibiis posticis parum dilatatis, intus rectis, extus arcuatis, bicarinatis et parum profunde sulcatis. 



S • Tibiae anticae calcare acuto basi lato et dentato. 



Long. 6|-7| millim. 



Eab. Guatemala, Senahu (Champion). 



14. Canthon politus. 



Canthon politus, Harold, Berl. ent. Zeitschr. 1868, p. 60 \ 

 Eab. South Mexico *. — South Ameeica, Colombia l . 

 I have not seen an example of this species from Mexico or Central America. 



15. Canthon forreri. (Tab. II. fig. 10.) 



O. prolo proxime afflnis, eeneo-viridis, supra subtiliter alutaceus, thorace nitidiore elytrisque subopacis ; capite 

 et thorace discrete punctulatis ; clypeo crebre ruguloso-punctato, 4-dentato, angulisque genarum prominulis 

 obtusis ; elytris distincte striatis, stria humerali subtiliter carinulata, interstitiis guttulis nitidis conspersis. 



Long. 6 millim. 



Eab. Mexico, Presidio (Forrer). 



Distinguished from its nearest allies by its rich dark green colour, and brilliant 

 thorax covered with scattered punctures. In sculpture it comes nearest C. probus. 



16. Canthon nyctelius. 



O. puncticolli (Lee.) proxime afflnis, nigro-violaceus, undique alutaceo-opacus et guttulis nitidis conspersus ; 

 capite punctulato, clypeo reflexo, sicut in G. proho 6-dentato ; thorace opaco, subtiliter sparsim punctulato, 

 medio basi elytrisque regione scutellari profunde depressis ; elytris haud profunde exarato-striatis, stria 

 humerali carinulata, interstitiis haud punctatis, 2° et 3° basi tumide elevatis ; pygidio punctulato ; corpore 

 subtus pedibusque nigris nitidis, ventro alutaceo, femoribus posticis setifero-punctatis tibiisque apice uni- 

 calcaratis. 



Long. 4-6| millim. 



Eab. Mexico, Santa Clara in Chihuahua, Chihuahua city, Durango city (Edge). 



Distinguished from C. puncticollis by the remarkable depression at the base of the 

 thorax and elytra, and the corresponding elevation of the second and third elytral 

 interstices at their base. The whole upper surface (including the pygidium) is smoothly 

 and evenly alutaceous and opaque, sprinkled with fine punctures, except the elytra. 



