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Update: I've added a few coments, plus links to photos/discussion of CAVIs at the bottom of the page:
These photos of a Solitary Vireo showing characteristics of Cassin's Vireo (Vireo cassinii) were taken by Martin Reid at Mosque Point, Lake Worth, Tarrant County, Texas on October 07, 2002. NOTE that the sky was fully clouded with the sun behind/left of the bird in these photos (taken with a telephoto lens, thus not subject to the paling I get when shooting through a telescope), this is causing the forecrown to look darker than in real life (it looked fairly uniform in the field, and the rear was quite olive in tone, blending into the mantle); note also the rather thin bill (how unusal is this?), and the thin, diffuse band of dusky-olive separating the off-white throat from the chest:

A fall bird from "lowland" Colorado, with discussion by Tony Leukering: Tony introduced this bird to ID-FRONTIERS in Spring 2002, and said, in part: "Here in Colorado, we get all three species, with BHVI being a vagrant (and it's on the review list). As I've posted to this format a couple times, CAVI is much more common than even the Colorado-breeding PLVI in fall out on the plains." - the underlined emphasis is mine, not Tony's.

A late summer bird from Nebraska: This is the only image of a CAVI that is somewhat backlit - all the above photos are clearly backlit - note how the crown looks shaded darker in this lighting, as it does in the above images (in real life the crown was a pale gray with greenish tones.)

A female on the nest in the Sierra Nevadas:

A bird from California:

A bird from Coastal British Columbia:

A late summer bird from Nebraska:

A selection of birds from California:

An unknown locality and date:

When you add to this mix the number of reports of CAVI from the Lubbock area in Fall, I wonder if we have a chicken-and-egg situation here: perhaps the "dull BHVIs" seen in the central third of Texas in September and early October are actually CAVIs? if so, then CAVIs are far more likely to drift eastwards into North-central Texas than current knowledge suggests (there is no formally accepted Texas record of CAVI east of the Pecos, I believe - although there are birds videod in Corpus Christie from Fall/Winter that seem likely to provide such documentation.)