OOPTERINTS. 269 
the elytra less convex, the minute tuberculiform scutellum visible when the insect is 
viewed from the side. 
2. Oopterinus castaneipennis, sp. n. 
Moderately elongate, shining, piceous or obscure castaneous, the elytra castaneous ; sparsely clothed with 
adpressed, rather long, yellowish-white hairs, the pubescence of the under surface and legs shorter and 
finer. Head convex, coarsely, closely punctate ; rostrum stout, much shorter than the prothorax, coarsely 
punctured and laterally sulcate, smoother and a little longer in the @. Prothorax longer than broad, 
convex, much narrowed behind, very sparsely punctate, except at the base and apex, a space on the flanks 
smooth. Scutellum minute, vertical. Elytra convex, about twice the length of the prothorax; very 
finely seriate-punctate, the punctuation becoming a little coarser towards the sides, the interstices flat, each 
with a scattered, irregular row of very minute punctures. Legs stout; femora each with a minute tooth. 
Length 34, breadth 1} millim. (¢ @.) 
Hab. Mexico, Juquila in Oaxaca (Flohr, mus. nostr. et Berol.). 
Two specimens. Distinguishable from the Guatemalan 0. gibbipennis by the visible 
scutellum, the less gibbous elytra, which are much more finely punctured at the sides, 
the smoother prothorax, and the non-metallic upper surface. The less elongate elytra, 
the smoother prothorax, &c., separate it from 0. piliferus. 
3. Oopterinus bactrianus, sp. n. (Tab. XIV. figg. 4, 4a.) 
Comparatively short, moderately shining, piceous or nigro-piceous, the antennz and the legs in part ferruginous, 
the tarsi paler ; almost glabrous above, the scutellum, under surface, and legs sparsely clothed with fine 
white pubescence, which, however, becomes dense along the meso- and metasternal side-pieces. Head 
convex and sparsely, somewhat coarsely punctate, the lateral supra-ocular portions abruptly depressed 
(the head appearing to be deeply sulcate immediately above the eyes), the eyes rather small and somewhat 
widely separated ; rostrum stout, much shorter than the prothorax, finely punctate. Prothorax elongate, 
globose anteriorly, and much narrowed and cylindrical behind, sparsely, minutely punctate, smooth 
towards the base. Scutellum minute. Elytra gibbous, ovate, a little longer and wider than the 
prothorax, smooth. First ventral segment depressed down the middle in the g. Legs rather slender ; 
anterior and intermediate femora each with a minute tooth, the posterior pair unarmed. 
Length 14-2, breadth 7,9 millim. 
Hab. Muxico, Teapa in Tabasco (H. H. Smith). 
Three specimens. A peculiar little species, with the elytra smooth, gibbous, and 
very little longer or wider than the prothorax, the scutellum visible, and the anterior 
and intermediate femora minutely dentate. ‘The convex portion of the head is sharply 
separated laterally from the supra-ocular portion, much as in Otidocephalus versicolor. 
4, Oopterinus gibbipennis, sp. n. 
Moderately elongate, shining, eneo-piceous, the antenne and legs in part ferruginous ; sparsely clothed with 
adpressed, rather long, yellowish-white hairs, the pubescence of the under surface and legs shorter. Head 
convex, closely, coarsely punctate, the eyes rather small; rostrum very stout, a little shorter than the 
prothorax, rugosely punctured and longitudinally wrinkled. Prothorax longer than broad, gibbous 
anteriorly and much narrowed behind, coarsely and rather closely punctate at the base and apex, the middle 
of the disc and the flanks much smoother. Scutellum invisible. Elytra gibbous to near the apex, rather 
more than twice the length of, and in their widest part nearly twice as wide as, the prothorax, narrowing 
from a little before the middle ; very finely punctate-striate on the disc, the punctuation becoming coarse 
