122 CORYLOPHIDZ. 
5. Corylophodes orbicularis, sp. n. 
Fere orbicularis, aterrimus, nitidissimus, impunctatus; pronoto brevi, antice circulariter rotundato, margine 
anteriore translucida, modice reflexa, margine basali ad scutellum valde producta, angulis fere rectis; 
elytris brevibus, quam pronotum sat longioribus, parum latioribus, prope humeros latissimis, lateribus late 
marginatis, marginibus piceis ; pedibus atque antennis testaceis, his clava obscuriore. Long. corp. ;% lin. 
=()'87 millim. 
Head rufo-castaneous; antenne testaceous, with the club dusky. Zhoraa short; circularly rounded in front, 
with the anterior margin moderately reflexed and transparent ; basal margin much produced towards the 
scutellum, with its angles almost rectangular. Scutellum broad, triangular. Hilytra short, rather longer 
and slightly broader than the thorax, widest near the shoulders ; sides broadly margined, with the margin 
piceous. Legs testaceous, with the three basal joints of the tarsi very large, and the last joint very long 
and slender. Underparts dark castaneous. 
Hab. British Honpuras, Belize (Blancaneaua). 
Differs from the other allied species in its small size, orbicular form, and glabrous 
impunctate surface. 
ORTHOPERINA. 
Thorax considerably excised in front. . . . . . . « « « «© + « ORTHOPERUS. 
Thorax not excised in front. . . . . . . . . . . =. . . +. . |RHYPOBIUS. 
ORTHOPERUS. 
Orthoperus, Stephens, Ill. Brit. Ent., Mand. ii. p. 186 (1829). 
Body oval or ovate, usually very convex. Head partly exposed, moderate; eyes small; antenne inserted 
before and above the eyes. Zhorax small, transverse, faintly excavated in front, the hinder angles not 
produced. Scwtellwm small, more or less triangular. Zlytra entire; rounded, or semiovate. Wings very 
large. Antenne geniculate; 9-jointed—l and 2 very large and long, 1 recurved, 3 and 4 very small, 
5 much larger than 4 or 6, 6 very small, 7-9 forming a moderately incrassated club. Palpi: maaillary 
large, 4-jointed—1 very small, 2 very large, ovate, 3 short, transverse, 4 large, rounded and much incras- 
sated at the base, pointed and slightly incurved at the apex, clothed throughout with rather long hairs ; 
labial large and very robust, 3-jointed—1 minute, 2 large and very robust, abruptly truncate at the apex, 
with several spur-like processes on the margin of the truncation, 3 minute, almost concealed within the 
truncate apex of 2. Mentum short, transverse, excavated anteriorly, the sides moderately rounded. Labium 
oblong, furnished at the apical extremity with long, erect, ovate paraglossal processes. Lingua large, 
apparently oblong. Zabrum large and broad, rounded anteriorly, and strongly constricted towards the 
base. Mandibles very large and strong, much hooked and bifid at the point, furnished at the base with a 
large process which is obliquely truncate in front, and serrate on each edge. Masille unilobed ; lobe rather 
large, armed at the apex with several long and very sharp curved teeth. Prosternum very short, elevated 
between the cox, and prolonged in front and behind them, pointed anteriorly and dilated posteriorly ; 
episterna small, but distinct ; epimera moderate, narrowly enclosing the coxal cavities; coxal cavities 
narrow and elongate. Mesosternum very short ; episterna large ; epimera long and narrow, almost reaching 
to the coxal cavities; coxal cavities moderately distant, ovate, apparently furnished with trochantins. Meta- 
sternum moderate, not extending to the sides of the body, its posterior margin between the coxee straight ; 
episterna large and very broad; epimera long, extending beyond the metasternum, and much rounded at 
the extremity ; coxal cavities rather large, pyriform, not extending to the sides of the body. Venter 
composed of six segments—1 long, 2-5 equal to each other in length, 6 longer than the preceding, simple. 
Legs generally long and slender: anterior with the trochanters small, triangular ; femora moderate ; tibie 
generally very long, and much incurved, sometimes uncinate; tarsi 4-jointed—1 rather long, 2 and 3 
generally equal, 4 sometimes very long and slender; claws moderate, sometimes unidentate beneath ; 
