New Genera and Species of Phytophaga. 429 
ultimis apice piceis; capite thoraceque subremote punctatis ; 
elytris fortiter subseriatim punctatis, antice rude transversim 
rugulosis, postice ad apicem longitudinaliter costatis. 
Var. A. Corpore subtus nigro-piceo, supra cupreo. 
Long. 3 lin. 
Hab. Siam. 
Head subremotely punctured, front impressed with a broad 
longitudinal groove ; epistome triangular, its apex obsolete; la- 
brum obscure fulvous. Thorax at the base nearly three times as 
broad as long; basal margin truncate and slightly oblique on 
either side, medial lobe nearly obsolete, its apex broadly obtuse ; 
sides converging and slightly rounded from base to apex; upper 
surface smooth, subremotely punctured.  Elytra each slightly 
excavated in the middle below the basilar space, coarsely punc- 
tured, interspaces raised into coarse irregular transverse reticula- 
tions ; towards the apex of the elytra they form broad longitu- 
dinal costee, which are most distinct near the suture and outer 
margin. 
Colasposoma viridieneum. 
Anguste oblongo-ovatum, convexum, viridi-zeneum ; tarsis an- 
tennisque piceis, his basi fulvis; capite thoraceque fortiter 
et crebre punctatis, illo plano, utrinque intra insertionem an- 
tennarum longitudinaliter elevato, hoc ante apicem transversim 
costato; elytris fortiter puvctatis, crebre transversim elevato- 
reticulatis. 
Long. 2¢ lin. 
Hab. Siam (Laos), 
Bright metallic green, breast and abdomen rather more ob- 
scure than the rest of the body. Head closely and coarsely 
punctured, subrugose; face depressed and flattened between the 
eyes, the lateral margin of the depressed portion thickened and 
forming a raised longitudinal edge close to the insertion of each 
antenna, sutural lines between the epistome and face entirely ob- 
solete ; labrum and palpi pale fulvous, ‘Thorax more than three 
times as broad as long, basal margin truncate on either side, medial 
lobe distinctly produced; sides rounded, converging in front ; 
upper surface closely and deeply punctured, immediately behind 
the apical border is a narrow transverse distinctly raised line, 
which extends about one-fourth part across the thorax, 
