On 16 August 1969 Harold Beecher found a presumed juvenile Marbled Murrelet (Brachyramphus marmoratum) alive, but in a weakened condition, on the beach at La Jolla, San Diego County, California. Attempts to revive the bird failed and it died the next day. The specimen was donated to the San Diego Natural History Museum (SDNHM No. 37215) and the occurrence was reported in Audubon Field Notes (McCaskie, 1970) as there are very few records of the Marbled Murrelet in southern California. In reexamining the specimen in comparison with juvenile Marbled Murrelets, several points of difference were noted – grayish cast, short bill, whitish tips to secondaries, and whitish rectrices. These points are characteristic of Kittlitz’s Murrelet (Brachyramphus brevirostre). As there appears to be no description of juvenile brevirostre – except for the brief characterization of Kozlova (1957) – the following notes are presented. Capitalized names of colors follow Ridgway (1912).