tional Institutes of Health (GM-12020).

Hyla xanthosticta new species

Plate 17

_Holotype._--Adult female, KU 103772, from the south fork of the Rio Las
Vueltas on the south slope of Volcan Barba, near the northwest base of
Cerro Chompipe, Heredia Province, Costa Rica, elevation 2100 meters;
obtained on June 26, 1966, by John D. Lynch.

_Diagnosis._--A member of the _Hyla pictipes_ group (Starrett, 1966),
characterized by having dorsum uniform green, canthal stripe
bronze-color, flanks and anterior and posterior surfaces of thighs dark
brown with bright yellow spots, throat and belly yellow, and hands
having only vestigial web.

_Description of holotype._--Female having a snout-vent length of 29.3
mm.; tibia length 16.2 mm., 55.3 per cent of snout-vent length; foot
length (measured from proximal edge of inner metatarsal tubercle to tip
of longest toe) 14.1 mm., 48.1 per cent of snout-vent length; head
length 10.0 mm., 34.1 per cent of snout-vent length; head width 10.3
mm., 35.2 per cent of snout-vent length. Snout in lateral profile
truncate, slightly inclined posteroventrally, in dorsal profile narrow
but truncate; canthus angular; loreal region barely concave; lips thick,
barely flared. Snout long; distance from anterior corner of eye to
nostril equal to diameter of eye; nostrils slightly protuberant,
directed laterally; internarial distance, 2.6 mm.; internarial area
slightly depressed; top of head slightly convex; interorbital distance
3.2 mm., 31.1 per cent of width of head; width at eyelid 2.6 mm.; 24.3
per cent of width of head. Diameter of eye 3.0 mm.; thin dermal fold
extending posteriorly from posterior corner of eye, above tympanum, to
point above insertion of arm. Tympanum distinct, its diameter half that
of eye.

Axillary membrane absent; arms slender; thin scalloped dermal fold on
ventrolateral edge of forearm; thin dermal fold on wrist; fingers long,
tapering; length of fingers from shortest to longest, 1-2-4-3; discs
small, only slightly wider than digits; subarticular tubercles large;
distal tubercle on third finger broad, flat; distal tubercle on fourth
finger strongly bifid; supernumerary tubercles large, round, closely
spaced irregularly on proximal segments of digits; prepollex moderately
enlarged. Web lacking between first and second fingers, vestigial
between second and third fingers, extending from middle of
antepenultimate phalanx of third to base of penultimate phalanx of
fourth. H