402 Rey. H. Clark on the Halticidee of South America. 
punctatum, flavum: thorax rufo-flavus, impunctatus, levis: elytra vitta 
obsoleta rufo-fusca a humeris vix apicem attinente: pedes, antenne et 
corpus subtus pallide testacei. 
Long. corp. lin. 23, lat. lin. 1}. 
Amazons, Para. Taken by Mr. Bates. 
Disonycha viridipennis. 
D. viridis vel fusco-viridis, nigro notata: caput super oculos transverse 
foveolatum, viridi-fuscum : thoraz viridi-flavus, macula media alteraque 
ad latus fuscis, impunctatus: elytra punctata, viridia, marginibus sutura 
macula juxta humeros et vitta post media juxta margines nigris: an- 
tenne rufo-fusce : corpus subtus et pedes nigri; tibiis et tarsis fuscis. 
Long. corp. lin. 23, lat, lin. 1}. 
Rio Janeiro. 
Genus Sysrrna, Chevr., &c. 
Parallela, elongatula. Caput subdepressum. Palpi mazillares breves, 
cylindrici, robusti, art. ultimo breviter acuminato. Thorax quadratus 
vel penitus quadratus, lateribus anticis et posticis rectis, marginibus 
etiam parallelis et rectis (interdum a medio versus apicem paulum con- 
tractis) marginatis; basis in speciebus quibusdam obsolete transverse 
depressa est. Scutellum triangulare. Elytra parallela, satis cylindrica, 
confuse vel aliquando striato-punctata. Pedes satis graciles ; unguculis 
bidentatis vel fortiter appendiculatis. Antenne filiformes haud elon- 
gate, art. 3 vix art. 1, 4 vel 5 longitudine equante, art. 4 et 5 sub- 
zequalibus. 
Systena is in some respects nearly allied to Oxygona; it is more 
parallel, narrower; the thorax is more quadrate and more distinctly 
rectilateral (the posterior angles being sharp, not rounded, the sides 
being parallel, not rounded towards the middle). 
Systena interrogationis, De}., Chevr., &c. 
Systena connexa? Boh. Eugenies, 1851, 191. 405. 
S. nigra; elytris vittis 2 albidis: caput fortiter punctatum, nigrum: 
thorax quadratus, marginibus anticis et posticis rectis, lateribus tenuiter 
marginatis, a medio ad apicem leviter contractis, subpunctatus: sew- 
tellum impunctatum, nigrum : elytra parallela, confuse punctata, nigra, 
vittee dus albide (ad margines iterumque juxta suturam) apicem ap- 
proximantes, versus apicem sese attingunt: antenne nigro-fusce : pedes 
et corpus subtus nigri. 
Long. corp. lin. 23, lat. lin. 4. 
I have received this species from Bahia and other parts of Brazil ; 
and also from Monte Video. 
