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duced tooth. Apex of mentum with triangular
medial tooth curved into oral cavity. Antenna
10-segmented; club slightly shorter
than other segments combined, slightly
shorter than clypeal length. Pronotum:
Surface glabrous, sparsely to moderately
punctate, with moderate punctures. Marginal
bead weak laterally, absent apically
and basally. Elytron: Surface glabrous; longitudinal
striae weakly punctate, punctures
moderate with dark coloration; intervals
sparsely punctate to impunctate. Suture
rounded apically. Pygidium: Width approximately
2.6 times length medially. Surface
densely punctate, weakly convex, glabrous
except near apex; setae short, tawny. Venter:
Thorax glabrous. Mesothoracic process
strongly produced, projecting anteriorly to
procoxa; apex broadly rounded; distinctly
diamond-shaped, ventrally flattened (Fig. 7).
Abdomen glabrous. Apical spiracles not extruding.
Legs: Protibia with 3 teeth in apical
half; first tooth largest, second, third
teeth sequentially shorter. Mesotibia and
metatibia widest medially. Protarsomeres
2-4 wider than long, cup-shaped. Protarsomere
4 with internoapical stridulatory
ridge. Protarsomere, mesotarsomere,
metatarsomere 5 without internal tooth.
Unguitractor plate cylindrical, with 1 apical
and 1 subapical seta. Modified protarsal claw
with length approximately equal to
protarsomere 5, greatly thickened and elongate
when compared with other claw, dorsoventrally
(slightly diagonally) flattened,
apex unevenly bifurcate. Modified
mesotarsal and metatarsal claws elongated
with ventral tooth, not thickened. Male
Genitalia: Phallobase 1.6 times longer than
length of parameres. Parameres smooth,
slightly curved dorsally.
Female (n=43). Length 23.1-25.7 mm,
width 13.8-15.9 mm. As male except in the following
respects. Legs: Protarsomere 4 without
internoapical stridulatory ridge. Modified
protarsal claw with ventral tooth, not thickened.
DIAGNOSIS. This species is distinguished
from all other species in the genus Platycoelia
by the following combination of charac-
MONOGRAPHIC REVISION OF PLATYCOELIA 75
ters: frontoclypeal suture complete; eyes
separated by more than 5 transverse eyewidths;
labrum with a well-developed, truncate
apical tooth strongly overlapping the
mentum; mentum with a distinct tooth curved
into the oral cavity; antenna 10-segmented;
antennal club shorter in length than the other
segments combined, shorter than the clypeal
length; elytral apices not capable of completely
covering the pygidium; mesothoracic
process diamond-shaped; mesosternum and
abdominal sternites glabrous; protibial spur
not noticeably shorter than the adjacent tibial
apex; mesotarsomere 4 and metatarsomere 4
in males without apical stridulatory ridge;
tarsomere 5 on all legs without an internal
tooth; parameres with apex rounded, not expanded.
DISTRIBUTION (Fig. 50). Mid to low elevation
montane areas of Costa Rica.
LOCALITY DATA. 121 specimens examined
from ABTS, AMNH, AJRC, BCRC, INBC,
MLJC, PKLC, RACC, SLTC, UCDC, UCRC,
UNSM, USNM, ZMHB.
COSTA RICA (117). ALAJUELA (5): Estación
San Ramón, Parque Nacional Rincon de la
Vieja. CARTAGO (82): Chirripó Indian Reserve,
Chirripó Valley, Grano de Oro, Irazú,
Moravia, Pejibaya, Turrialba.
GUANACASTE (24): Estación Cacao,
Estación Pitilla. HEREDIA (2): Las
Horquetas de Sarapiquí. LIMÓN (1): Batán.
SAN JOSÉ (3): Estación Carrillo.
PANAMÁ (1). NO DATA (1).
NO DATA (3).
One paralectotype labeled “Columb. Rio
Dagua” was considered to have no data. This
disjunct record is unlikely, since no other
specimens are known from Colombia. The
Panamá record is somewhat dubious, but
more likely considering the close proximity to
some known localities for P. mesosternalis in
Costa Rica.
TEMPORAL DATA. March (19), April (39),
May (37), June (18), July (1).