Wildlife of Lao PDR: 1999 Status Report - IUCN

surviving known specimen of his (actually from Savannakhet
Province) was in fact a Blunt-winged Warbler (Dickinson
1970b). The only extant specimen from north Lao PDR (listed
in Bangs and Van Tyne 1931) was also re-examined and found
to be B. seebohmi (Dickinson et al. in press). Field identification
of birds in this genus is very difficult.
Bradypterus seebohmi Russet Bush Warbler. Presumed resident
subject to local altitudinal movements; north B8 . Grass
and scrub above 1200 m, probably lower in winter. The species
has recently been recorded from two survey areas, Nam
Ha and Phou Louey NBCAs (Tizard et al. 1997, Davidson
1998), and is known from one historical specimen published
as B. luteoventris (see that species).
Locustella lanceolata Lanceolated Warbler. Winter visitor;
north, centre, south B2 . Reeds, paddy-fields, scrub and grass,
especially near water; also sometimes abundant in undergrowth
of dry dipterocarp forest and occasionally in forest
edge and secondary growth. Up to at least 1200 m.
Locustella certhiola Rusty-rumped Warbler (= Pallas’s
Grasshopper Warbler, ^Sm 2 , ^T; = Pallas’s Warbler ^K, ^Sm 1 ).
Winter visitor; north B9 , south B2 . Reed, grass and dense herbs,
especially near water; lowlands. Because of morphological
similarities with L. ochotensis Middendorff’s Warbler, some
recent field records were considered provisional; however
this latter species has yet to be recorded anywhere in Southeast
Asia.
Acrocephalus bistrigiceps Black-browed Reed Warbler.
Winter visitor; north B2 , centre B16 , south B2 . Reeds and grass,
wet paddies and riverine scrub; usually near water.
• Acrocephalus agricola Paddyfield Warbler (includes A.
tangorum Manchurian Reed Warbler as separated by ^Sm 1 ).
Conservation Significance: Little Known in Lao PDR. Documented
Range and Habitat: Winter visitor: north (Robson
1996), south B11 ; rank wetland vegetation. Status Information:
At least one A. (a.) tangorum in marsh vegetation in Dong
Khanthung PNBCA on 11 February 1998 (Round 1998) constituted
the first record of this form for Lao PDR, which is
better regarded as a full species (Leisler et al. 1997). One in
Vientiane (Mekong channel) in December 1995 (Dymond
1995) was the first record of A. a. agricola. Great care is
needed to separate these two forms (Leader and Lewthwaite
1996, Round 1998). The species is best considered Little
Known in Lao PDR. Clarification of the seasonal status of
tangorum is needed. If the two forms were separated as species,
A. a. agricola would not merit treatment as a key species,
being only a winter visitor of marginal occurrence and
no global conservation concern. By contrast, there is only
one currently known wintering site of A. (a.) tangorum
Birds
(in south-west Thailand) and it is probably Globally Threatened
(Round 1994).
Acrocephalus concinens Blunt-winged Warbler. Winter visitor;
north (provisionally B9 ), centre (historically, Dickinson
1970b), south (provisionally B9 ). Reeds and grass, usually in
wetlands; 180-1120 m. Records prior to 1996 were reviewed
by Duckworth et al. (1998a). This species is difficult to identify
in the field and so recent records are retained as provisional,
including that in Dong Ampham NBCA initially
reported by Davidson et al. (1997) as confirmed.
Acrocephalus orientalis Oriental Reed Warbler (included
in A. arundinaceus Great Reed Warbler by ^K, ^Sm 2 , ^T).
Winter visitor; north (provisionally B2 ; historically, David-
Beaulieu 1948), centre (historically B22 ), south B11 . Reed beds
and other dense growth, usually near water. Field separation
from Clamorous Reed Warbler is difficult and most records
are therefore retained as provisional. Historical specimens
suggest that Oriental Reed Warbler is likely to be much more
common than is Clamorous, but there is some ambiguity
(see Thewlis et al. 1996).
Acrocephalus stentoreus Clamorous Reed Warbler. Seasonal
status unclear: north (historically, David-Beaulieu
1948). Habitat use probably similar to that of A. orientalis.
Birds of this species could have been overlooked as Oriental
Reed Warbler, recently and historically (e.g. David-Beaulieu
1949-1950). Records from prior to 1994 were reviewed in
Thewlis et al. (1996).
Acrocephalus aedon (= Phragamaticola aedon, ^K) Thickbilled
Warbler. Winter visitor; north, centre, south B2 . Dense
grass and other thickets, often near water; also in undergrowth
and edge of broken forest. Occurs up to at least 1120 m
Orthotomus cuculatus Mountain Tailorbird. Resident;
north B7 , centre B10 , south B2 . Evergreen forest, bamboo, secondary
growth, scrub; invariably above 1000 m.
Orthotomus sutorius Common Tailorbird. Resident; north,
centre, south B2 . Scrub, bamboo, open secondary growth,
towns, villages; up to at least 1200 m.
Orthotomus atrogularis Dark-necked Tailorbird. Resident;
north, centre, south B2 . Forests and dense regrowth, up to at
least 1000 m.
Phylloscopus fuscatus Dusky Warbler. Winter visitor; north,
centre, south B2 . Dense undergrowth, usually near rivers or
ponds; also town and village gardens. Winters generally in
lowlands but passage birds occur at higher altitudes.
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