558 CUCUJIDA. 
elongate, parallel-sided, but with a very indistinct waving or crenulation of the sides, 
the base much produced ; surface very densely sculptured, opaque, with traces of two 
longitudinal impressions along the middle. Elytra very narrow, the sculpture dense 
and fine, seriate. ‘Two specimens. 
This little Nausibius is nearest to WV. elongatus, Grouv., but that species is 53 millim. 
long. The narrow form of this insect gives it some resemblance to Cathartus, but the 
sculpture is like that of the Silvani of the S. bidentatus group. 
SYNOBIUS, gen. nov. 
Antenne glabre, parum clavate. LEpipleure late. Tarsi articulis tribus basalibus sat latis. 
I am obliged to establish a new genus for a single insect apparently allied to 
Nausibius, Cathartus, and Hapalips. It departs entirely from Cathartus by the broad 
epipleurw, and from both it and Nausibius by the structure of the feet, which are but 
little different from those of Hapalips, there being three joints at the base, equally 
and moderately broad, then a very small fourth joint, and a terminal joint not quite so 
long as the three basal joints; but the greatest peculiarity of the genus is the peculiar, 
glabrous, rigid antenne. ‘The structure of the sterna is that normal in the Silvanides. 
1. Synobius lobicollis, sp.n. (Tab. XVII. fig. 24.) 
Latiusculus, subdepressus, piceo-castaneus; prothorace angulis anterioribus lobato-productis, marginibus 
lateralibus argute elevatis, subrectis; elytris densissime subtiliter sculpturatis, brevissime pubescentibus. 
Long. 4} millim. 
Hab. Panama, Bugaba (Champion). 
Antenne piceous, shining, nearly rigid, each joint of the elongate, narrow, 3-jointed 
club longer than broad, the terminal joint small, only half as long and half as 
broad as that preceding it. Head broadly and rather deeply transversely impressed 
just in front of the eyes, which are small. Thorax quadrate, very slightly broader 
behind, base truncate, not produced in the middle, the sides slightly irregular, the 
front angle furnished with a large lobe projecting forwards and looking as if intended 
for a shield or protection to the eyes. LElytra rather broad, the sculpture little more 
than a roughness due to the insertion of the very numerous, fine and minute, short, 
depressed hairs. Legs short. 
I anticipate that this curious insect will prove to be myrmecophilous or termito- 
philous in habits. 
CATHARTUS. 
Cathartus, Reiche, Ann. Soc. Ent. Fr. 1854, p. 77. 
Reiche referred this genus to the Colydiide. It is, however, extremely close to 
Silvanus, and no satisfactory way of distinguishing the two genera has been pointed 
