64 HETEROMERA. 
One example. From A. obovata and A. convexa, Lec., it may be known by its smoother 
surface, and the slightly broader, though less reflexed, lateral thoracic margins. 
35. Asida sphericollis. (Tab. III. fig. 15.) 
Obovate, black, shining. Head broadly impressed in front, anterior margin finely punctured; prothorax trans- 
verse, strongly and transversely convex, smooth, very narrowly margined, the sides rounded, hind angles 
obsolete, front angles obtuse and scarcely prominent, the base rounded; elytra convex, about as broad as 
the thorax at the base, gradually widened to beyond the middle, then narrowed, with the apex a little pro- 
duced, the marginal carina obsolete, and represented only by a very short ridge at the shoulders, humeral 
angles obtuse, finely and sparingly punctured, the suture depressed towards the base, and with traces 
of dorsal grooves; anterior tibie with a short tooth at outer apical angle. Beneath shining, almost 
impunctate ; intercoxal process raised, and level with the metasternum. 
Length 13 millim. 
Hab. Mexico, San Luis Potosi (Dr. Palmer). 
One example. ‘This is the smallest and narrowest Asida (Euschides) I have yet seen ; 
it resembles somewhat A. convexicollis from Arizona, though very much smaller than 
that species. 
TISAMENES. 
Head deflexed, sunk into the prothorax up to the eyes; lateral margins of the front swollen and rounded; 
epistoma broadly but not very deeply emarginate; labrum prominent, triangularly emarginate, clasped 
by the mandibles; mentum large, transverse, fitting closely to the short bluntly toothed side pieces 
of the submentum; gula deeply sunk into the prothorax, the side-pieces of the submentum alone 
visible; ligula concealed; eyes transversely oval; prothorax with the lateral margins angular and greatly 
expanded; elytra with prominent ridges, clothed towards the suture with rows of densely matted 
decumbent hairs; antenne very short, the joints widening but little outwardly, third joint twice as 
long as second, fourth to ninth decreasing in length, tenth broad, subtriangular, eleventh short, small, 
and rounded at the apex, and clothed with short spiny hairs; femora, tibie (the latter truncate at 
the apex, and the outer angle with a short, blunt tooth), and tarsi very stout, densely clothed with 
scales, smooth, without any indication of tubercles or punctures, the tarsi with short spiny hairs, and 
not sulcate beneath ; middle coxal cavities widely open externally, trochantin large and prominent; inter- 
coxal process broadly rounded in front, and with the anterior margin raised; epipleure broad, vertical, 
narrowed towards the base and apex. 
Allied to Asida, and resembling A. elata, Lec., somewhat in the form of the thorax, 
but with stouter limbs, the head deflexed, &c. 
One species from Mexico. 
1. Tisamenes truquii. (Tab. IT. fig. 15.) 
Elongate, strongly convex, dark reddish brown, pubescent, densely clothed with scale-like hairs. Head broadly 
impressed in front, indistinctly punctured; prothorax with the lateral margins raised and greatly 
dilated a little before the middle, and produced into a broad, subtriangular, blunt tooth (rounded in front 
narrowed and emarginate behind to the base), sinuate before the anterior angles, which are blunt, 
slightly truncate, and not prominent, emarginate in front, the base almost truncate, the hind angles obtuse; 
finely rugulose, the dise on each side with a sinuous fulvous band, slightly spotted or marked wath yellow: 
elytra elliptic in form, convex, much narrowed towards the base, rounded at the sides, scutellum smnall, 
humeral angles produced into a prominent, outwardly directed, short, blunt tooth, with a marginal and nes 
dorsal ridges obsolete before the apex, the dorsal ridges clothed with densely matted dark brown hair, the 
suture a little raised, bare and shining, the interval between the inner dorsal ridge and the suture with 
