390 Rey. H. Clark on the Halticidee of South America. 
Genus Oxyconvs*. 
Satis lata, subparallela, elytris plerumque levibus, haud striato-punctatis. 
Caput penitus verticale breve. Palpi mazillares articulo ultimo sub- 
globoso, parum cylindrico. Thorax transversus, elytris angustior, 
lateribus marginatis et rotundatis, et angulis posticis etiam rotundatis, 
angulis ipsis dente brevi vel tuberculo notatis, angulis anticis plerum- 
que breviter prominulis, thorax ad basin vix transverse foveolatus. 
Scutellum triangulare. Elytra parallela, apice rotundato, punctata, 
haud striata. Pedes modice elongati; unguiculis dente brevi ad basin 
utrinque armatis. Antenne filiformes, art. 1° elongato, 2° brevi, 3-11° 
secundo longioribus, subzequalibus. 
Oxygona acutangula, Chevr. Col. Mex. 1. c. fas. 3. 1. 
melanocera, Klug, MSS. 
tarsalis, Reiche, MSS. | 
Var. A. denticollis, Germar (MSS. ?). 
geniculata, De}. Cat. ed. 3. p. 413. 
tibialis, Reiche, MSS. 
Baluaria, Chevr. MSS. 
nigricornis, Chevr. MSS. 
O. parallelus, punctatus, flavus, antennis femorum apicibus tibiis tarsisque 
aliquando etiam abdominis apice nigris : caput super antennarum bases 
transverse et inequaliter depressum, impunctatum, nitidum: thorax 
impunctatus, levis, margine anteriori plus minus marginato: scutellum 
triangulare, impunctatum: elytra robusta, parallela, punctata, punctis 
aliquando obsoletioribus: corpus subtus pallide flavum, abdominis apice 
nigro-fusco: pedes pallide flavi, genubus tibiis tarsisque nigris: antenne 
nigre. 
Long. corp. lin. 33-33, lat. lin, 23-24. 
As will be evident from the synonymy, I have included as the re- 
presentatives of one single species several slightly aberrant forms. 
O. acutangulus, Chevr., is found only in Mexico, where it is probably 
not uncommon; it is larger and of more pallid colour than its 
Brazilian representative, this is the denticollis of Germar, which I 
believe to be nothing more than a local variety; it is somewhat 
smaller, decidedly more rufous, the legs are generally entirely black, 
and the punctuation of the elytra is, in some examples, manifestly 
more coarse. I possess a specimen from Monte Video, and another 
labelled Cayenne, which are smaller in size. The species has (if I 
am right in my determination) a very extended range, being found 
from Mexico to the Plate River. 
* T change Oxycona, Chevr., into Oxygonus; the name Oxyconta having been 
more recently appropriated.—H. C, 
