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180 THE TRIBE ONCIDERINI
tinctly and broadly margined with pale grayish-yellow. Body beneath dark-brown,
rather thinly clothed with fulvous-gray pubescence; abdominal sternites laterally
indistinctly maculate with denser pubescence. Legs piceous, rather thinly covered
with dark brown and iulvous-gray variegated pubescence. Antennae piceous, scape
black; entirely thinly clothed with brown pubescence, with scattered single white
hairs on scape and third segment; all segments beginning with third whitish annu­
late at least all lower surface of bases.
Head above with a median impressed line from occiput to epistoma; front con­
cave between antennal tubercles, finely, densely punctate, with large, scattered punc­
tures interspersed; genae feebly vertical, very finely, densely punctate, with scat­
tered, coarse punctures; eye with lower lobe ovate, onc and two-thirds times as high
as gena; antennal tubercles rather well separated, prominent, feebly produced at
apex. Pronotum transverse ; sides arcuate, narrowed to apex, with a feeble tu­
bercle behind middle, which is armed at apex with an obtuse process; one apical
and two basal transvere sulci, iI1Iler of which is shallow and broad, extended ob­
liquely over latcral tubercles; disk at middle before base with a broad, feebly ele­
vated tumescence, each side of middle two otlier feeble, elongate, tumid areas, placed
transversely, the two basal lateral tumid areas coarsely, deeply punctate as are the
bases of the lateral tubercles. Scutellum transverse, sides straight, oblique, apex
subtruncate. Elytra feebly tapering to apices, which are separately broadly
rounded; basal third finely, densely granulate-punctate, these punctures sometimes
confluent and forming transverse rugosities, laterally behind humeri coarsely rugose,
rcmaindcr of disk with a few coarse punctures ; humeri scarcely prominent, posterior
angle with a modcrate-sized tubercle. Prosternum widened behind. Procoxae
prominent, with a feebly raised, subacute tubercle ; profemora somewhat abruptly
elavato after bas.'l.i third, fillCly, transvcrsely rugose on basal' two-thirds of posterior
face, and slightly so on anterior. Fifth stcrnite one-balf longer than fourth, apex
rounded, and with a feebly impressed median line, expanded triangularly apically.
Antennae slightly longer -than body, fimbriate sparsely on scape and fifth segment,
more strongly on third and fourth; scape somcwhat abruptly clavate after basal
third, moderately grooved at base, rest of surface very finely punctate; third seg­
ment longer than scape, feebly arcuate, rest gradually shorter.
LENGTH 25-26 mm.; width 9-9.5 mm.
Holotype.-Female ; Barro Colorado, Canal Zone, December,
1930 ; (Griswold) ; [M.C.Z.].
Paratype.-Female ; topotypic ; [M.C.Z. J.
Tybalmia coeca Bates
PLATE VII, FIGURE 15.
Tybalmia coeca Bate.';', Trans. Ent. Soc. Lond., 1872, p. 201.
rl'he V-shaped macula at the middle of each elytron, the bisin­
uate third segment of antennae, and unitubel'culate humeri will
serve to distinguish this species.