378 HETEROMERA. 
O. serraticornis (Chevr.), 0. dilaticornis, &c., the inner apical angles of joints 4-10 are 
more or less strongly and angularly produced. The eyes are usually very large and 
approximate, though sometimes small and widely separated. ‘The thorax in some 
species, O. impressipennis, O. nicaraguensis, &c., is margined at the sides, though the 
margin is not or only in part visible from above. The posterior femora are unarmed 
in our species. In the male of 0. hamatus the anterior trochanters are produced into 
a sharp curved tooth. The genus is now known to range as far north as the low hot 
forest-region of Guatemala. 
1. Eyes large, approximate. 
a. Anterior trochanters unarmed in the male. 
+ Elytra with the suture and lateral margins lighter or unicolorous. 
1. Otocerus dilaticornis. (Tab. XVI. fig. 18, 3.) 
Elongate, rather convex, brownish-piceous, slightly shining. Head large and broad, moderately finely and 
rather closely punctured in front, much more coarsely so behind, the intraocular space transversely im- 
pressed, the impression longitudinally grooved in the middle in front; eyes exceedingly large, extending 
laterally a little beyond the sides of the prothorax, approximate in front; antenne (¢) long, very 
greatly dilated and serrate within from the fourth joint (joints 4-10 all strongly produced at their inner 
apical angle), joint 3 swollen at the apex, very short, joints 4-9 differing very little in length and width, 
10 narrower than 9, 11 as long as but much narrower than 10, oblong ovate, obliquely truncate at the 
apex, 1-3 shining, 4—11 dull and coarsely and rugosely punctured, the extreme base and apex ferruginous, 
the rest black ; prothorax rather narrow, moderately transverse, subquadrate, convex, a little flattened on 
the disc, the sides immarginate, nearly straight, and with a short blunt median tooth, the anterior angles 
rather broadly rounded, the hind angles subrectangular and extending outwards, the apex straight, the 
_ base feebly sinuate, both very strongly and completely margined, the disc canaliculate (except in front), 
broadly and shallowly depressed behind, and with a small deep rounded depression on each side about the 
middle, the basal fovex large and deep, the surface sparingly and rather finely (but deeply) punctured ; 
scutellum subtriangular, distinctly punctured; elytra long, subparallel in their basal third, the sides 
thence to the apex a little rounded and very gradually converging, deeply and rather coarsely crenate- 
striate, the crenate impressions coarsest a little below the base (from the third stria outwardly) and 
thence to the apex gradually becoming finer, the interstices almost smooth and strongly and equally 
convex throughout, the suture, lateral margins, and epipleurw red; beneath moderately shining, finely 
and rather sparingly punctured, the sides of the metasternum and the flanks of the prothorax coarsely so; 
legs rather long, rather coarsely and closely punctured (the femora more shallowly so), reddish, the knees 
a little darker ; the first joint of the posterior tarsi long, longer than the apical joint ; anterior tibic slightly 
curved, and the fifth ventral segment broadly flattened in the middle, in the male. 
Length 16 millim.; breadth 44 millim. (¢.) 
Hab. Panama, Bugaba 1000 feet (Champion). 
A single example. ‘This species cannot be satisfactorily compared with any hitherto 
described, though it approaches the Brazilian 0. serraticornis in some of its characters. 
2. Otocerus torolz. (Tab. XVI. fig. 19, 3.) 
Elongate, subcylindrical, moderately convex, unicolorous brownish-piceous, rather dull, Head large and 
broad, moderately coarsely and closely punctured in front, coarsely and rugosely so behind, the intraocular 
