Rev. H. Clark on the Halticide of South America. 399 
Ceporis subcostata. 
C. nigra, thorace et margine elytrorum (tenuiter) flavis : caput ad oculorum 
margines fortiter punctatum, leve, nigrum: thorax levis, flavus, macula 
media antica transversa et altera basali, macula etiam laterali utrinque 
fusco-flavis: scutellum impunctatum, nigrum: elytra levia, subtilissime 
rugosa, nigra, leviter flavo-marginata: antenne, pedes et corpus subtus 
nigri. 
Long. corp. lin. 23, lat. lin. 1}. 
Mexico. From the collection of the Marquis La Ferté. 
Ceporis marginata. 
C. nigra, thorace, sutura, et marginibus flavis: caput impunctatum, flavum: 
thorax ad basin confuse punctatus, flavus, macula media nigra insulata : 
scutellum impunctatum, nigrum : elytra parallela, leevia vel subtilissime 
punctata, nigra, sutura et margine tenuiter flavis: antenne rufo-fusce ;. 
pedes nigri; tibiis tarsisque flavis: corpus subtus nigrum. 
Long. corp. lin. 22, lat. lin. 1. 
Buenos Ayres. From the collection of M. Chevrolat. 
Genus Prtonta, Clark. 
Ovalis, satis depressa. Caput breve, verticale; ocwl ovales, apud mar- 
ginem interiorem sinuati, vix excavati. Palpi mazillares satis elongati, 
art, 2ndo cylindrico, 3tio aliquot inflato brevi, 4t¢ brevi triangulari. 
Thorax transversus, rectangularis, vix latitudine elytrorum basin 
zequans, angulis anticis subrotundatis posticis subacutis, lateribus satis 
marginatis et subrotundatis, disco plerumque impunctato, apud basin 
fovea transversa obsoleta lata. Scutellwm triangulare, impunctatum. 
Elytra subparallela, apice rotundata, subtilissime reticulata, et inter- 
dum sparsim et confuse punctata. Antenne filiformes, graciles, art. 3 
paulum secundum superante, art. 4, 5, et 6 subaqualibus longioribus. 
Pedes modice elongati; tarsorum art. 2 minuto; wngwiculis simplicibus. 
I have formed this genus for the reception of a little group of 
pretty species, chiefly Amazonian, which have manifestly a special 
relationship to each other, but the relationship of which to and its 
differences from other allied groups it is not so easy to describe in 
writing. The species that compose it may primd facie be distin- 
guished by the peculiar, fine reticulation of their elytra, which 
makes the surface appear dull and dead, rather than shining; they 
may also be well separated from neighbouring forms by other cha- 
racters—the relative lengths of the joints of the antenne, the dis- 
tinct but obsolete transverse depression of the basal part of the 
thorax, and the form of the maxillary palpi. 
The following species are here described :— 
