The type locality of Cyanocorax unlcolor was given in the original description (Bull. Acad. Roy. Sci. Belglque, 14, pt. 2, 1847, sance of Aug. 7: 103) simply as Mexico. It was later (Esquisses Ornithologiques, livr. 4, 1848: pl. 17 and text) restricted to Tabasco, although two localities in Oaxaca and also Vera Paz, Guatemala, were induded in the range. Hellmayr (Field Mus. N.H., Zool. Ser., 13, pt. 7, 1934: 58, footnote) has very properly challenged the supposition that this species could occur anywhere in Tabasco and suggested a re-examination of Du Bus' type in the Brussels Museum. I examined this type in July, 1939. It is definitely and in detail the specimen from which was drawn the description and subsequent plate. Du Bus had two other birds from Mexico, respectively from San Pedro, near Oaxaca, and Tepitongo, Oaxaca but both of them are young of the year and have parti-colored bills. These were mentioned by Du Bus but have no standing as co-types, although someone (probably Dubois) has marked one of them as such both on the label and in the catalogue. The type, collected by Auguste Ghiesbreght in "Tabasco," probably in the spring of 1838 or 1839, is a very good example, in color, and in size an extra large one (sex not indicated; wing, 172; tail, 165), of the race cur- rently known as Aphelocona unicolor coelestis Ridgway. That name of course becomes a synonym of Aphelocona unicolor unicolor (Du Bus) and the south- central Mexican race will probably be known as Aphelocoma unicolor concolor (Cassin) Proc. Acad. Nat. Sci. Phila., 4, 1848: 26). A critical re-examination of Cassin's type must be made, however, especially in view of the initial uncertainty of the type locality. September. 1942 GENERAL NOTES 213 Vol. 54, No. 3 As to the purported type locality of Cyanocorax unicolor, both Pierce Brod- korb and E. A. Goldman inform me that there are no mountains in Tabasco any- where nearly high enough to accommodate this cloud-forest species which south of the Isthmus of Tehuantepec has never been taken below 7,000 feet. The only explanation is either that Tabasco took in more territory then than now, or that Ghiesbreght (who definitely did some collecting in Tabasco) entered an adjacent part of Chiapas without being aware of the fact. Ghiesbreght secured other high mountain species in "Tabasco," such as Turdus rufftorques and Peucedramus olivaceus. One of these might have been secured in Tabasco through some for~ tuitous circumstance, but that all three could have come from there verges on the impossible. Sylvia taeniata Du Bus (Bull. Acad. Roy. Sci. Belgique, ibid.: 104) has always been placed in the synonyiny of Sylvia olivacea Giraud. The type, an adult male in the Brussels Museum, is from "Tabasco" and, although the catalogue does not so state, was without doubt collected by Ghiesbreght in the same locality as the type of Cyanocorax unicolor. It is the race now known as Peucedramus olivaceus auran- tiacus Ridgway and that name now becomes a synonym of Peucedramus olivaceus taeniata (Du Bus). The wing and tail measurements of the type are 70 and 49.5 mm., respectively. Incidentally, Bonaparte's statement (Consp. Gen. Avium, 1, 1850: 309) that the subsequent plate (Esq. Orn. livr. 6, 1850: pl. 28) was from a specimen from San Pedro, near Oaxaca, is not correct. The type is the basis of the plate and I may add that Wilhelm Meise made a similar notation on the tag in 1938. While it is certain that Chiapas, not Tabasco, is the type region of both of the above birds, I have no first hand knowledge of the topographical details of that state. Obviously a spot as close as possible to the Tabasco boundary should be selected, but a definite selection may well be left to Pierce Brodkorb, in view of his extensive work in Chiapas.--A. J. v.r Rossr, University of California, Los Angeles.