Mr. J. 8. Baly on new Genera and Species of Phytophaga. 437 
more quickly narrowed towards their apex; the shoulders are 
more produced. In P. tomentosa the scutellum is obtuse; the 
longitudinal depression on the back of the elytra commences 
just beneath the scutellum, and not below the basilar space, as 
in P. Thoreyi. In addition to the above, there are numerous 
other small differences. 
Fam. Gallerucide. Subfam. Halticine. 
Systena Batesit. 
S. elongata, pallide prasina, nitida; oculis nigris; antennis pallide 
rufo-fuscis; thorace basi transversim suleate : elytris tenuiter 
punctatis ; linea suturali vittaque submarginali ante apicem ab- 
breviatis, obscure viridibus. 
Long. 3 lin. 
Hab. Ega, Upper Amazons. Collected by Mr. H. W. Bates. 
Head smooth, obsoletely punctate. Thorax slightly trans- 
verse, Impressed in front of the base by a shallow transverse 
groove; disk obsoletely punctured; sides narrowly margined, 
straight and parallel from their base to beyond the middle, 
thence slightly converging to the apex. LElytra broader than 
the thorax, parallel, moderately convex, slightly depressed below 
the basilar space, more distinctly punctured than the thorax, the 
punctures indistinctly arranged in numerous longitudinal strie. 
Genus NisoTra. 
Corpus oblongo-ovatum aut ovatum, convexum. Capvé paullo 
exsertum ; facie non carinata, supra insertionem antennarum trans- 
versim lmpressa ; epistomaée paullo incrassato ; antennis subfiliformi- 
bus, 11-articulatis; ocu/is prominulis. Thorax transversus, margini- 
bus basali et apicali utrinque longitudinaliter impressis. /’/ytra tho- 
race paullo latiora, breviter ovata; limbo inflewo obliquo; distincte 
punctata, punctis in strias bifarias confuse dispositis. Pedes: femoribus 
posticis valde incrassatis, subtus canaliculatis; ¢7é7¢s posticis dorso non 
canaliculatis, apice spina valida acuta armatis ; ¢arszs ad apicem tibi- 
arum insertis ; wnguiculis appendiculatis. Prosternum subelongatum. 
Type, Nisotra gemella, Erichs. Manilla. 
In addition to the short basal thoracic impressions (common 
to Podagrica and other genera of Halticine), Nisotra has two 
others on its apical border, placed exactly opposite those at the 
base, and armed on their outer edges with a minute tooth, 
from each impression a longitudinal groove extending back- 
wards for a greater or less distance across the disk of the thorax. 
The genus may also be separated from Podagrica by the peculiar 
striation of the elytra; in coloration (more or less red, with me- 
tallic-blue elytra) the majority of the species resemble many of 
the species of Podagrica. 
In its geographical distribution Nisotra appears to be princi- 
pally Eastern, the species of the genus spreading themselves 
