76 
Mr. J. S. Baly on new Genera 
in length, the second joint short, ovate, half the length of the 
third, the latter three fourths the length of the fourth ; the 
three lower joints flavous, the rest black. Thorax transverse ; 
the sides straight and parallel, rather broadly margined, the 
anterior angles scarcely produced, obtuse, the hinder ones 
acute; the basal margin with its middle portion sinuate ; 
surface very minutely punctured, the punctures only visible 
under a deep lens ; hinder disk flattened, impressed on either 
side with a deep fovea; in the middle, just in front of the basal 
margin, is a third, smaller and less defined. Scutellum 
shining black, its apex obtuse. Elytra oblong, very coarsely 
punctured, the interspaces very irregularly wrinkled and 
rugulose. 
Diabrotica octosignata. 
D. late ovata, nigra, nitida ; thorace minus crebre distincto punctato, 
utrinque profunde fovcolato, lateribus reflexis piceis; elytris sat 
crcbre punctatis, late marginatis, fulvis, utrinque punctis quatuor, 
duobus infra basin, duobus vix pone medium, transversim dis- 
positis, nigris. 
Long. 3| lin. 
Hah. Mexico, Oaxaca. 
Head scarcely longer than broad, trigonate ; front impressed 
above the encarpas with a deep fovea; encarpse thickened; 
carina raised, sublinear. Antennae entirely black, the second 
joint half the length of the third, the latter two thirds the 
length of the fourth. Thorax transverse; sides straight and 
parallel, rounded and converging at the apex, the anterior 
angles slightly produced, thickened, obtuse; disk distinctly 
punctured, the puncturing finer and more scattered on the 
anterior disk ; on either side, scarcely behind the middle, is a 
large round fovea. Scutellum shining black, smooth, im- 
punctate. Elytra much broader than the thorax, broadly 
margined; each with four small black spots, placed transversely 
and somewhat obliquely in pairs, two some distance below 
the base and two just behind the middle. 
Diabrotica Jacobyi. 
D. anguste ovata, postice ampliata, modice convexa, flava, nitida, 
tibiis, tarsis, postpectore capiteque nigris ; antennis articulis 
basalibus tribus piceo tinctis, quarto, octavo ultimoque nigro- 
piceis; thorace bifoveolato palfide rufo-piceo ; elytris modice 
convexis, dorso paullo deplanatis, crebre tenuiter punctatis, infra 
eallum humerale elevato-vittatis, et intra vittam longitudinaliter 
sulcatis, obscure cyaneis, limbo laterali, apice lato, fascia lata 
subarcuata communi, vix infra medium sita, vix intra limbum 
