264 llcv. H. Clark on Dejcan's Genus Coelomera. 



3. D. ruficruSf Chcv. 

 D. parallelling opacum, tomentosum, rufo-flavum, elytris, antennis 

 et genibus nigris ; caput levitcr rugosum, impunctatum, flavum ; 

 thorax subpubcseens, rufo-flavus ; scutellum fuscum ; elytra pa- 

 rallela, tomentosa, nigra ; antennce nigrse ; corpus subtus rufo- 

 fuscum ; pedes fuscij femoribus ruib-fuscis. 

 Long. corp. lin. 4-|; lat. lin. If. 

 Cayenne. 



Genus XL Monocesta. 



E majoribus, robusta, plerumque versus apicem dilatata. Caput 

 verticale, basi longitudinaliter foveolatum. Thorax transvcrsus, 

 inargirie antcriore paulum emarginato ; angulis anticis sat productis, 

 lateribus subrotundatis ; angulis posticis omnino vel penitus obso- 

 lctis ; discus transverse et fortiter depressus est. Scutellum trans- 

 versum, apice rotundatum. Elytra robusta, thorace latiora, post 

 medium plus minus dilatata, aliquando versus apicem debiscentia, et 

 utrinque angulata, marginata, j)imctata. Antennce vel filiformes 

 robustee vel subincrassatse, art. 1° apice incrassato, art. 1°, 3° et 4° 

 subsequalibuSj art. 2° minore, art. 5° et 6° subsequalibus, paulum 

 quarto brevioribus, art. 7°-1 l m paulum sexto brevioribus et gradatim 

 attenuatis. Pedes robusti, art. tarsorum basali penultimo duplo 

 longiore ; unguiculis fortiter utrinque biridis. 



The genus Monocesta, as thus defined, is very natural : it 

 represents those species in which the elytra are postmedially 

 dilated, the thorax is transversely depressed, and the antennae 

 in the more broadly ovate species filiform, in the more parallel 

 species subincrassated, the third and fourth joints being sub- 

 equal, and the apical joints sufficiently produced and attenuate. 

 These characters comprehend two distinct subgroups, which will 

 constitute an excellent genus, well bounded and separated from 

 the several other forms with which the species representing 

 them have been, in Dejean's Catalogue, mixed up. The metro- 

 polis of the genus is evidently the tropical region of South 

 America and Mexico. One species (M. coryli) is found as far 

 north as Illinois, where it infests the hazel; and one other (M. 

 elegantula of this paper) I have received as from Brazil. 



Division A. 



Species of large size ; in form {for the most part) postmedially 



dilated; the thorax is deeply transversely depressed ; the an- 



tenna' filiform and sufficiently elongate. Species 1-12. 



Section I. 



Elytra for the most part bright blue or bright green, with flavous 



markings. Sp. 1-5. 



1. M. imperialis. 

 M. grandis, apice dilatato, crebre punctata, nigro-caerulea, elytrorum 



