February, IRTS.] 201 j NOTES ON HETEROMERA, AND DESCRIPTIONS OF NEW GENERA AND SPECIES (No. 5). BY F. BATES. ULOMIMIMUS, nov. gen. At once to be distinguisliecl from Aiitlmachus and Ulovia by tlie anterior tarsi being dilated and clotbed beneath with a brush of dense, short hairs, the penultimate joint much smaller than the preceding ; and by the anterior tibise being strongly triangularly dilated, and furrowed above for the reception of the tarsi in repose. Mentum cordiform, densely pilose ; last joint of labial palpi elongate-oval, slightly attenuate at apex, that of the maxillary elongate-triangular, and obliquely truncate at apex ; antennge short, joint 3 longer than the following, 5 — 10 more or less transverse, perfoliate, equal at each side of the antennal axis, the 11th very large, rounded; head immersed in the prothorax to the hind margin of the eyes, nearly concealing the neck ; labrum strongly transverse, slightly emarginate in front, the angles rounded ; epistoma produced beyond the level of the insertion of the antennae, emarginate in front, the angles rounded, the suture well marked by an impressed line angular at the sides ; prothorax a little wider than long, moderately convex, sides rather sharply contracted in front, widest before the middle, thence gradually narrowed to the base, apex rather strongly (and slightly sinuously) emarginate, front angles prominent, base almost squarely truncated, the hind angles forming obtuse angles, faintly margined at the base and apex (obso-letely so at the middle of the latter), more strongly at the sides, without pit or excavation anteriorly ; scutellum large, triangular, the sides sinuous ; elytra but little wider at the base than the base of the prothorax, moderately convex, sub-parallel, base slightly emargi-nate, humeral angle distinct ; epipleural fold entire, but very narrow behind ; legs robust, the four posterior femora compressed ; tibias strongly compressed, the anterior strongly and sinuously dilated from near the base to the apex — which is four times the width of the base ; superiorly, at the inner side, channelled for the reception of the tarsi in repose, the apical half densely pilose within, the outer margin entire {i. e., neither dentate nor serrate), longitudinally keeled on the under face, the keel raised up in the middle into a broad pointed tooth, exterior to this keel the under-surfaee is studded with short, spine-like teeth, which, close beneath the margin — both lateral and apical — are equidistantly ranged in line ; the four hind tibia; are triangular, the outer apical angle produced ; excepting at base and apex, they ai'e closely and coarsely punctured and hispid, inner margin
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