Proposal
(113) to South
American Classification Committee
Remove Oncostoma
cinereigulare from Hypothetical List to Main List
Effect on South American CL: This transfers a
species from our Hypothetical List to the Main List.
Background: Our Hypothetical List currently reads
as follows:
"Oncostoma
cinereigulare Northern
Bentbill: A specimen was reported from northern Colombia (Romero &
Rodriguez 1965), but see Ridgely & Tudor (1994) for reasons to treat the
record as hypothetical until the specimen is re-examined."
New information: The lone specimen for
Colombia and S.A. is in our collection and in my opinion is unquestionably cinereigulare,
a species I know well from many years in Costa Rica. Although the range
disjunction is indeed worrisomely huge, and no further specimens or sightings
have been made (perhaps in part because the area in question is "zona
roja" as regards security), I have no reason to doubt the identification
or the authenticity of the locality data and recommend restoring this species
to the main list.
Literature Cited:
RIDGELY, R. S., AND G. TUDOR. 1994. The birds
of South America, vol. 2. Univ. Texas Press, Austin.
ROMERO, Z. H., AND J. V. RODRIGUEZ. 1965.
Lozania 31: 5-6.
Gary Stiles, April 2004
Comments from Nores: "SI. Aunque nada conozco de esta especie confío en la experiencia de Gary Stiles."
Comments from Jaramillo: "YES A
specimen exists and has been identified as such by folks who know what they are
talking about (Gary Stiles et al), so I am comfortable adding this one to our
main list."
Comments from Schulenberg: "I trust Gary's
judgment on the identification of the specimen, which he has seen and the rest
of us have not.
"At the same time, it's hard not to be
curious about this record. The specimen comes from northwestern Antioquia, near
Chigirodo (Romero and Rodriguez 1980 [not 1965], Hilty and Brown 1986). Is Oncostoma
olivaceum known from the same locality? or what are the nearest reported olivaceum
localities? Is there anything more to be added to the story at this stage,
other than that the specimen exists?"
Comments from Zimmer: "NO. I am truly
on the fence on this one. On the one hand, I trust Gary's identification. On
the other, I have to question how this bird could come from the locality in
question. Unless we are prepared to accept the idea of a vagrant bentbill, you
really have to wonder about this record. How sure can we be that the locality
data on the specimen are accurate? I would like to know more about the
proximity of the nearest O. olivaceum populations. I always felt that
field separation of the two species was fairly straightforward, but then again,
except in west-central Panama, the two are separable on geography alone. There
are assertions in the literature (Ridgely and Tudor 1994) that some olivaceum
individuals have whitish underparts (and therefore, are more like
cinereigulare). I haven't personally noted any such individuals, but Bob must
have some basis for making this statement. I'd like to know a little more about
this issue in particular. Until then, my inclination is to err on the side of
caution and vote NO."
Comments from Silva: "Yes. I trust in
Gary's identification, but it would be a challenge to evaluate the nature of
this record."