new Species of Halticine. 319 
raised transverse ridge which extends entirely across the 
clypeus; jaws piceous; antenne filiform, two lower joints 
flavous, the third piceous, the rest black; third joint distinctly 
shorter than the fourth. ‘Thorax with its sides broadly mar- 
gined, reflexed, straight and parallel from the base to beyond 
the middle, thence rounded and converging to the apex, 
anterior angles thickened, produced into a short excurved 
obtuse tooth; basal margin faintly sinuate on either side, its 
median portion truncate ; upper surface smooth and shining, 
very faintly reticulate-granulose; surface of dilated lateral 
margin irregular, subrugulose. Scutellum trigonate, its apex 
obtuse. Hlytra broader than the thorax, convex, slightly ex- 
cavated on the suture, a short distance below the scutellum ; 
coarsely and closely punctured, interspaces irregularly thick- 
ened, granulose. 
Gdionychis recticollis. 
@. elongato-ovata, postice vix ampliata, convexa, subtus picea, ab- 
domine sordide fulvo, prothorace lacteo; supra lactea, scutello 
pallide piceo, antennis (basi picea excepta) oculisque nigris ; 
thorace impunctato, lateribus rectis, a basi ad apicem convergenti- 
bus; elytris tenuissime, subremote punctatis, utrinque plagis 
duabus erosis, una infra basin transversim ovata, altera inter 
medium et apicem transversa, irregulari, nigro-piceis ornatis. 
Long. 4 lin. 
Hab. Mexico. 
Vertex smooth, impunctate; front impressed with coarse 
punctures ; encarpz ill-defined, pale piceous, separated from 
each other by a deep longitudinal groove; carina broad, 
oblong, convex, its apex obtuse, branching off on either side 
into a strongly raised oblique ridge; lower edge of clypeus 
and mouth nigro-piceous ; eyes narrowly oval, their inner side 
sinuate; antennz filiform, two lower joints piceous, the rest 
black ; third and fourth joints nearly equal in length. Thorax 
twice as broad as long; sides narrowly margined, straight, 
converging from base to apex, anterior angle thickened, 
strongly produced, its apex subacute; basal margin slightly 
sinuate on either side near the outer angle, the intermediate 
space transversely truncate ; upper surface smooth, impunctate, 
lateral margin narrowly reflexed. Scutellum longer than 
broad, trigonate, its apex obtuse. Llytra broader than the 
thorax, narrowly oblong, moderately convex, the lateral mar- 
gin narrowly dilated. 
Gdionychis Clarkia. 
. elongato-ovata, modice convexa, pallide flava, nitida ; thorace 
