Rev. H. Clark on Dejcan's Genus Ccelorncra. 265 



dimidio apicali rufo-flavo ; caput fovea longitudinali ad frontem, 

 impunctatum ; thorax subtiliter punctatus ; scutellum transverse 

 quadratum, impunctatum ; elytra thorace latiora, et versus apicem 

 multum ampliata, marginata, crebre punctata ; antennce, corpus 

 subtus et pedes nigra, femorum apicibus rufo-fuscis. 

 Long. corp. lin. 9j ; lat. lin. ad humeros 4, ad apicem 6j. 

 Columbia. 



2. M. equestris, Dcj. 



M. e majoribus, versus apicem subampliata, crebre punctata, viridis 

 vel azurea, fascia media in elytris transversa flava ; caput longi- 

 tudinaliter foveolatum, punctatum ; thorax ut in speciebus aliis in 

 medio valde transverse depressus, punctatus ; scutellum sub- 

 quadratum, impunctatum ; elytra versus apicem ampliata, crebre 

 et rugose punctata, fascia recta flava transversa ad medium, versus 

 margines latior, elytra ornat ; antennce, corpus subtus et pedes 

 nigra. 



Long. corp. lin. 9-6^ ; lat. lin. 5|-2^. 



M. equestris, the Cayenne species, differs clearly and uniformly 

 in pattern from the Mexican species, M. ducalis. In the species 

 before us, the transverse band on the elytra is medial and even, 

 sometimes, by reason of its greater breadth towards the margins, 

 being slightly inflected ; in M. ducalis the transverse band is 

 never straight, but arcuate, in each elytron, broader in size and 

 more irregular in pattern. 



Mr. Baly has shown me in his cabinet a species taken by Mr. 

 Bates on the Amazons, in which the transverse band is a trifle 

 broader, and rather nearer the scutellum, than in M. ducalis — 

 M. Batesii, Baly. It is probable that the two are slight modi- 

 fications of the same species. 



The males of M. equestris have sometimes the apex of the 

 elytra, at a little distance from the suture, produced into an 

 angle. 



A common species in Cayenne. 



3. M. ducalis. 



M. elongata, versus apicem subampliata, punctata, nigro-cserulea, 

 fascia lata et apice flavis ; caput foveolatum, punctatum ; thorax 

 transverse depressus, leviter punctatus ; scutellum lseve ; elytra 

 crebre punctata vel subrugosa, nigro-cserulea, fascia lata inaequali, 

 ad margines versus humeros et apicem tendente, et apice flavis ; 

 pedes, antennce et corpus subtus nigra. 

 Long. corp. lin 8-6 ; lat. lin. 5-3. 



I have before me several specimens of this form, which agree 

 entirely in pattern, and are readily separated from the Cayenne 

 species, M. equestris : the band of the elytra is broader, more 

 irregular in outline, and extending along the marginatum to the 

 apex, and sometimes to the shoulders. I have an interesting 



