316 Mr. J. 8S. Baly on some 
limb slightly concave, its outer edge scarcely produced.. Pro- 
sternum oblong-quadrate, the lateral margins concave, the 
apex truncate, the upper surface nearly plain; outer edge of 
hinder tibie serrulate near the apex; basal joint of hinder 
tarsus longer than the following two united. 
This species differs from the typical form of the genus in its 
broader prosternum, and in the less strongly produced outer 
edge of the inflexed limb of the elytra. 
Gdionychis Mouhott. 
@. elongate-ovata, modice convexa, sordide flava, nitida, pectore 
piceo; vertice scutelloque nigris; thorace ante basin leviter 
trausversim impresso, tenuissime, remote punctato, lateribus late 
reflexo-explanatis; elytris sat fortiter, crebre punctatis, utrinque 
linea suturali maculisque tribus disco exteriore longitudinaliter 
positis, prima super callum humerale, basi adfixa, secunda prope 
medium tertiaque ante apicem, nigris. 
Var. A. pectore sordide flavo, elytrorum linea suturali nigra obso- 
leta. 
Long. 3 ln. 
Hab. Siam, Pachybouri. Collected by the late M. Mouhot. 
Vertex minutely punctured, front impressed with large 
round foveolate punctures ; encarpe subquadrate, contiguous ; 
carina short, wedge-shaped, its acute apex extending upwards 
between the encarpe for rather more than a third their length, 
its base terminating on a strongly raised transverse ridge, 
which extends obliquely on either side entirely across the 
clypeus ; antenne filiform, the third and fourth joints equal. 
Thorax three times as broad as long; sides broadly dilated, 
reflexed, straight and parallel for two thirds their length, 
rounded and converging near the apex, the latter anteriorly pro- 
duced, armed at its extremity with a slightly excurved, truncate 
tooth; basal margin sinuate on either side near the outer 
angle, the intermediate space truncate; upper surface im- 
pressed before the base with a broad but shallow transverse 
groove; minutely and remotely punctured; lateral margin 
longitudinally concave. Scutellum trigonate, its apex rounded. 
Elytra rather broader than the thorax, convex, the outer 
margin moderately dilated, reflexed. 
Gdionychis pretiosa. 
@. ovata, convexa, nitida, subtus nigro-picea, lateribus flavis ; supra 
fulva, vertice, antennis, pedibus posticis scutelloque nigris; thorace 
impunctato ; elytris suberebre punctatis, metallico-cyaneis, yio- 
