Considerable confusion exists concerning the specific identity of the glossy ibises inhabiting Louisiana. The fourth edition of the A. O. U. Check-list (1931: 33) stated that _falcinellus_ "breeds rarely and locally in central Florida and probably in Louisiana." In 1932, Holt visited the marshes of Cameron Parish in southwestern Louisiana where he studied the ibises nesting in a large rookery. Later he definitely stated (Auk, 50, 1933: 351-352) that the birds seen by him were Eastern Glossy Ibises (_Plegadis falcinellus_). It was doubtless Holt's identification that influenced Oberholser to list _falcinellus_ as a fairly common local resident in the state (_op. cit._, 78). This, however, is contrary to the evidence at my disposal. My associates and I have studied thousands of glossy ibises in the marshes of southwestern Louisiana in the past ten years. These observations include numerous field trips into the region where ibises are plentiful throughout the year, especially during the breeding season. I have also visited a large nesting rookery in Cameron Parish, the only one in the state known to me, and the one which I have every reason to believe is the same colony visited by Holt in 1932. Although Holt identified as _falcinellus_ the birds seen by him at a nesting rookery in Cameron Parish, I have never seen that species anywhere in Louisiana except at Grand Isle, 150 miles east of Cameron, as henceforth noted. In winter when the White-faced Glossy Ibis lacks the white on its face, some difficulty might be encountered in differentiating that species from the Eastern Glossy Ibis. The perplexing thing, however, is that Holt made his observations in the nesting season when no possible confusion should exist; also he was in the middle of a nesting rookery with birds close at hand on all sides. This fact notwithstanding, the ibis nesting in the Cameron Parish rookery (known locally as "The Burn") on May 28, 1942, was the white-faced species (_Plegadis mexicana_), as evidenced by moving pictures taken by J. Harvey Roberts and by specimens of varying ages collected at the same time by me. In all, the Louisiana State University Museum of Zoölogy has 19 specimens of _mexicana_ taken in Cameron Parish in April, May, November, December, and January. Field records are available also for the months of February, March, July, and September.