Rev. H.Clark on Dejean's Genus Coelomera. 319 



brevibus : difFert etiam in forma corporis ; in speciebus plurimis 

 corpus parallelum, rarius post medium ampliatum : in reliquis genus 

 Monocestam sequat. 



The above diagnosis will suffice to point out the peculiarity of 

 the antennae, which is sufficiently important to constitute a very 

 natural genus : the third joint is more than usually produced, 

 and the fifth and subsequent joints are very short. There is also 

 a general diflFerence in form : while one or two species [and those 

 from the head quarters oi Monocesta, Cayenne and the Amazons], 

 C. Cayennensis, C. modesta, resemble Monocesta in the post- 

 medial dilatation of the elytra, the majority of species (which are 

 from Brazil) are decidedly more parallel, though robust in form ; 

 and several species from New Granada and Columbia are en- 

 tirely parallel and subattenuate. 



Section I. 



Species more or less broadly ovate ; elytra broadly margined. 



Species 1-7. 



1. C. modesta. 



C. depressa, lata, punctata, flavo-fusca, prothorace et antennis flavis ; 

 caput ad basin longitudinaliter foveolatum, punctatum, rufo- 

 flavum ; thorax satis latus, punctatus, rufo-flavus ; scutellum sub- 

 quadratum, punctatum ; elytra depressa, lata, versus apicem am- 

 pliata, leviter flavo-pubescentia, rugosa, flavo-fusca ; antennce rufo- 

 iuscse, art. l°-3™ flavescentibus ; corpus subtus Qt pedes rufo-fusca. 



Long. corp. lin 7\; lat. lin. 5. 



This species differs from M. rufo-fusca in the greater breadth 



of its thorax, its differently formed scutellum, its more depressed 



form, and its coloration. 

 Amazons. 



2. C rufo-fusca. 



C. lata, subpubesceus, leviter rugosa, rufo-fusca ; caput longitudina- 

 liter atque etiam transverse foveolatum, punctatum, rufum, fovea 

 longitudinali iterumque basi nigris ; thorax vix ut in C. modesta 

 latus, sed trausversus, punctatus, rufus, macula utrinque nigra 

 insulata; scutellum punctatum, rufo-fuscum ; elytra satis lata, 

 satis robusta, rugosa, subpubescentia, rufo-fusca; antennce art. 1° 

 _4'« nigris, reliqui desunt ; pedes nigri, femoribus fusco-nigris ; 

 corpus subtus rufum. 



Long. corp. lin. 6^; lat. lin. 4. 



C. rufo-fusca is certainly nearly related to the Amazonian 

 C modesta. I decide, however, that it must be a distinct spe- 

 cies : its coloration is different (this of itself has no value in this 

 group); but, besides coloration, the thorax is relatively much 

 narrower. 



Brazil. A single example from the collection of M. Laferte. 



