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....
not being any kind of expert on this (although having puzzled over it
before) I shall just cite a couple of authorities on the adults only, both
based, I assume, on painstaking examination of specimens –
THE
DIRECTORY: lateralis – “throat pale grey, tinged
variably pale citrine yellow; breast clear mid grey, grading extensively
deep russet-cinnamon over flanks ...” : westernensis
– throat light citrine-yellow, the tone often restricted
to upper throat; breast clear mid-grey, grading pale to mid dull russet
brown over flanks ...”
HANZAB
mentions varying factors such as age, state of moult, where collected
etc: lateralis – “Chin and throat whitish grey or greyish
white in centre, grading to pale yellow-olive or yellow at sides; some
birds have a faint yellow-olive wash on centre of chin and throat. ... Flanks
and sides of belly, light brown or warm brown, fairly sharply demarcated
from belly ... slight differences between males and females in colour of
flanks”. Westernensis – “ ... chin and throat
yellow-olive or yellow, usually grading slightly paler ... on centre of chin
and throat; in a few birds, yellow-olive does not extend to centre of
chin and throat, these resembling most richly pigmented nominate [[[ie
lateralis]]]” “UNDERPARTS: As nominate, but flanks
paler cinnamon brown or light brown in both sexes, fairly diffusely
demarcated from duller off-white belly and vent; some birds have a
faint pale yellow tinge to belly and vent ...” [[[Colour-guide
citations omitted ]]]
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