98 HETEROMERA. 
broad—in the female transversely convex, strongly rounded at the sides, slightly narrowed and sinuate 
just before the base, narrower at the base than at the apex, widest about the middle, anterior angles 
rounded, hind angles prominent but obtuse ; in the male less convex, the sides straighter and less distinctly 
sinuate before the base, the base very distinctly margined and sometimes with a shallow transverse fovea 
on each side near the angles, rather closely, finely, and shallowly punctured, sometimes with traces of an 
- obsolete central line or groove; elytra a little wider than the thorax at the base, rather short and inflated, 
moderately rounded at the sides, widest behind the middle, transversely convex, humeri obtuse, finely and. 
shallowly punctate-striate, the punctures rather distant one from the other, the interstices flat, with fine 
oblique or transverse irregular scratches. 
Length 14-16 millim. (d 92.) 
Hab. Mexico, Parada, Yolos (Sallé), Oaxaca, Cerro de Plumas (Hége). 
Seven examples. 
2. Mitys levis. (Tab. V. fig. 6.) 
Oblong ovate, black, shining. Head smooth or almost imperceptibly punctate ; prothorax as long as or longer 
than broad, slightly rounded at the sides, widest a little behind the middle, a little narrower at the apex 
than at the base, moderately convex, the base very distinctly margined, exceedingly finely and sparingly 
punctured ; elytra slightly wider than the thorax at the base, feebly rounded at the sides in the male, 
rounded and more narrowed towards the base in the female, the disc slightly depressed, smooth, or rarely 
finely and indistinctly punctate-striate. 
Length 13-16 millim. (¢ 2.) 
Hab. Mexico, Tehuacan, Las Vigas, Esperanza (Hége). 
Sent in numbers by Herr Hége. Comparatively longer, smoother, narrower, and less 
convex than MV. inflatus; the thorax not sinuate at the sides before the base; the 
elytra comparatively longer, less inflated, and nearly smooth. 
3. Mitys opacus. 
Ovate, dark reddish brown, subopaque. Head almost smooth ; prothorax as in M. levis; elytra short, convex, 
feebly rounded at the sides, a little wider than the thorax at the base, almost smooth, with traces of 
obsolete stris, the interstices flat. 
Length 13 millim. 
Hab. Mexico, San Antonio de Arriba (Sa//é). 
One example. Smaller, and narrower, and of a different form to MW. inflatus; the 
thorax and elytra longitudinally and not transversely convex; comparatively shorter 
(the elytra especially) than I. levis. MM. opacus may be known from both the 
preceding species by its dull opaque surface ; it is possibly a form of UW. levis. 
GENOPION. 
Form of Mitys. Mentum (Tab. V. fig. 8a) strongly transverse, the sides inflexed anteriorly, the anterior angles a 
little produced, broadly but feebly emarginate in front, the sides rounded posteriorly, a short oblique elevation 
on each side in the middle, coarsely rugulose; last joint of the maxillary palpi subtriangular; inner 
lobe of the maxill furnished with coarse spiny hairs (Tab. V. fig. 86); antenne short, sixth, seventh, and 
eighth joints the broadest, ninth and tenth transverse, last joint a little narrower ; labrum transverse, large, 
prominent, feebly emarginate, anterior margin densely clothed with hair; epistoma broad, scarcely 
