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238 BULrLETIN 133, UNITED STATES NATIONAL MUSEUM
LEPIDOCOLAPTES ANGUSTIROSTRIS CERTHIOLUS (Todd)
Picolaptes hivittatus certhiolus Todd, Proc. Biol. Soc. Washington, vol. 26,
Aug. 8, 1913, p. 173. (Curiche Rio Grande, eastern Bolivia.)
Four specimens from west of Puerto Pinasco, Paraguay, a female
shot at Kilometer 25 on September 1, and three from Kilometer 80
(two males secured September 9 and 13, and a female taken September
17), seem best referred to the present form, described from
eastern Bolivia. L. a. certhiolus differs distinctly from L. a. angustirostris
in the fainter streaking on the ventral surface that in some
specimens becomes nearly obsolete. The four skins from near
Puerto Pinasco agree closely with the type of certhiolus (that through
the kindness of W. E. Clyde Todd, has been compared directly with
them) in color and amount of streaking on the breast and abdomen.
The Paraguayan specimens are slightly variable in this respect,
some representing a closer approach to typical angustirostris than
others. They are slightly duller above than the type of certhiolus,
and are also a trifle smaller (in males, wing, 91.6-95.2 mm.). In
Mr. Todd's type-specimen the wing measures 100.6 mm.
Examination of a small series of these wood hewers shows con-
clusively that the bird with unstreaked breast, known as hivittatus,
intergrades through certhiolus with the heavily marked group that
has been maintained as angustirostr'is. In fact, intergradation seems
so complete as to render division into forms difficult, since, when the
vast range occupied is considered, comparatively few localities have
been represented in the series seen. Since angustirostris of Vieillot
is the older name, the forms of the species as at present known will
stand as follows
: )
LEPIDOCOLAPTES A. ANGUSTIROSTKIS (Vieillot).
Dendrocopus angustirostris Vieillot, Nouv. Diet. Hist. Nat., vol. 26, 1818,
p. 116. (Paraguay.)
Lower surface heavily streaked; streaks of head terminated on
nape.
Eastern (?) and southern Paraguay, northern Argentina (Chaco,
Tucuman), probably south to the limits of the Chaco in the Province
of Santa Fe.
LEPIDOCOLAPTES A. PRAEDATUS (Cherrie).
Picolaptes angustirostris praedatus Chekrie, Bull. Amer. Mus. Nat. Hist.,
vol. 25, May 20, 1916, p. 187. (Concepcion del Uruguay, Entre Rios,
Argentina.
Larger than angustirostris with longer bill, and with the streaks
on the head and nape extended onto the lower back.
Central Argentina (Entre Rios, northern, Buenos Aires, and
central Pampa) and Uruguay (Rio Negro).