Rev. H. Clark on Dejean's Genus Coelomera. 263 



posticis obsoletis, disco valde transverse dei)resso. Elytra parallela, 

 depressa, subtiliter rugosa. Antennco filiformes, art. 1° et 3° sub- 

 aequalibus, 2" minuto, 4" et 5° subsequalibus et tertio paulum brevi- 

 oribus. Pedes graciles, uiiguiculis utrinque bifidis. 



The form of the thorax in this group is peculiar; it is nar- 

 rowly transverse, the anterior angles are laterally producedcon- 

 siderably beyond the head ; the sides converge gradually towards 

 the base, being arcuate or constricted medially ; the basal angles 

 are slightly prominent ; and the disk of the thorax is distinctly 

 and deeply transversely depressed. I know of three exponents 

 of this form, all common species in the tropics of South America. 



1. D. nigripenne, Fab. Ent. Syst. i. ii. 14. 9; Syst. El. i. 480. 



Notable by its uniformly opaque-black elytra (rugose and to- 

 mentose) and its clearly coloured rufous or flavous thorax. 

 Long. Corp. lin. 4^-5^; lat. lin. 2-2^. 



The species is very common in Cayenne : some examples have 

 the apical joints of the black antennae testaceous ; and one ex- 

 ample in my cabinet has the head testaceous instead of black. 



2. D. cinctipenne. 



D. oblongum, parallelum, opacum, reticulosum, tomentosum, fusco- 

 flavura, elytris (sutura et marginibus exceptis) et capite nigris vel 

 viridi-nigris ; caput inter oculos longitudinaliter foveolatum, crebre 

 punctatum, nigrum ; thorax fortiter transverse depressus, punc- 

 tatus, plus minus tomentosus, flavus, macula utrinque nigra magna 

 aliquando insulata ; scutellum flavum ; elytra parallela, nigra vel 

 nigro-viridia, sutura et marginibus tenuiter flavis; pedes nigri, 

 femoribus plus minus flavis ; corpus subtus flavo-fuscum ; antennce 

 nigrse, art. 9"- 11"' flavis. 



Long. Corp. hn. Sg-?; lat. lin. l^-Sg. 



D. cinctipenne varies not only in size, but in the sculpture 

 and coloration of the thorax, which is either entirely flavous or 

 flavous with two submedial black markings, one on either side, 

 these markings sometimes occupying nearly the whole disk. 

 The species has been found at Para, by Mr. Bates and others. 

 I have two Columbian representatives of it, which have the ely- 

 tra opaque green instead of black, and the thorax of which is not 

 so deeply depressed. I have seen some interesting examples of 

 this species in Mr. Baly's cabinet, which, at first sight we are 

 tempted to declare, represent distinct species : I have little 

 doubt, however, on more mature examination, that the above 

 diagnosis is the true definition of the species. The insect is as 

 variable as it is beautiful ; and at present, at any rate, we have 

 not sufficient material to justify us in breaking it up into dis- 

 tinct races or species. 



