264 Rev. H. Clark on Dejean^s Genus Coelomera. 



3. D. ruficrus, Chev. 

 D. parallelum, opacum, tomentosum, rufo-flavum, elytris, anteniiis 

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

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

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

 fuscum ; pedes fusci, femoribus rufo-fuscis. 

 Long. corp. lin. A\; lat. lin. 1|. 

 Ca3'enne. 



Genus XI. Monocesta. 



E majoribus, robusta, plerumque versus apicem dilatata. Caput 

 verticale, basi longitudinaliter foveolatum. Thorax transversus, 

 margine anteriore paulum emarginato ; angulis anticis sat productis, 

 lateribus subrotundntis ; angulis posticis omnino vel penitus obso- 

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

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

 medium plus minus dilatata, aliquando versus apicem dehiscentia, et 

 utrinque angulata, marginata, punctata. Antennee vel filiformes 

 robustae vel subincrassatse, art. 1° apice incrassato, art. P, 3° et 4" 

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

 quarto brevioribus, art. 7°-! 1" paulum sexto brevioribus et gradatim 

 attenuatis. Pedes robusti, art. tarsorum basali penultimo duplo 

 longiore ; unguiculis fortiter utrinque bifidis. 



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 sufiiciently 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~ 



tennce 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. 

 31. grandis, apice dilatato, crebre punctata, nigro-cserulea, elytrorura 



