Rey. H. Clark on the Halticidee of South America. 401 
Pelonia rufo-testacea. 
P. ovalis, depressa, elytris crebre punctatis, pallide rufa: caput super an- 
tennarum bases bifoveolatum, et ad frontem fortiter longitudinaliter 
carinatum : thorax impunctatus, marginibus leviter fuscatis : scutellum 
leve: elytra crebre punctata, vitta obscuriore media rufo-fusca, penitus 
obsoleta, nec basin nec apicem attinente: pedes, antenne et corpus 
subtus pallide rufi. 
Long. corp. lin. 2, lat. lin. 1. 
Petropolis, Rio Janeiro. Taken by Mr. John Gray, in February 
1857. 
Genus Disonycua, Chevr. Dej. Cat. 
Parallela. Caput penitus verticale. Palpi mazillares elongatuli, art. 
penultimo incrassato, ultimo brevissimo. TZhorax transversus, elytra 
latitudine penitus eequans, margine anteriore vix emarginato recto, 
lateribus paulum rotundatis et marginatis, basi sinuata haud transverse 
foveolata, angulis anticis sat rectis, posticis subrotundatis. Scutellum 
triangulare. -Elytra parallela, satis elongata, confuse punctata, ple- 
rumque vittis nigris vel flavis ornata. Antenne filiformes, art. 3 se- 
cundo longiore sed 1 et 4-7 breviore. Pedes graciles; wunguiculis sim- 
plicibus. 
The form of the thorax of Disonycha brings it near to Oxygona ; 
it differs from this genus in the greater breadth of the thorax, and 
its general more parallel as well as elongate form, and also in the 
length of the third joint of the antenne, which in Disonycha is dis- 
tinctly shorter than the first or third. Disonycha more closely still 
approaches in characters Litosonycha ; it can never be confounded 
with this, being in form more cylindrical, more elongate, and having 
the sides of the thorax more depressed. 
The genus is abundantly represented; but the question of separa- 
tion of species composing it renders it one of the most perplexing 
genera in the whole of the Halticide. 
Disonycha trifasciata. 
D. nigra, prothorace rufo-flavo, elytris fasciis tribus pallide flavis: caput 
super oculos fortiter punctatum: thorax quinquemaculatus; maculis 
fuscis, una utrinque versus latus, 2 versus apicem, 1 versus basin: 
elytra punctata, fasciis tribus pallide flavis latis ad suturam interruptis, 
basali, media et apicali: antenne nigre, art. 1-3 fusco-flavis: pedes et 
corpus subtus rufo-fusci. 
Long. corp. lin. 33, lat. lin, 1}. 
Venezuela. 
Disonycha adumbrata. 
D. flaya, thorace rufo-flavo ; elytris vitta rufo-fusca obsoleta: caput im- 
