. Catalogue of the Birds in the British Museum. 29. CYANOCOUAX. 119 lores, feathers round the eye, cheeks, and ear-coverts black; fore- head and a faintly defined eyebrow greyish cobalt; entire throat whitish shaded -ndth purplish blue, with a small spot of black at the base of the chin, the gular patch margined below with a shade of blue-black ; all the rest of the under surface of body smalt-blue, the thighs and under wing-coverts rather more ashy ; bill and legs black. Total length 9-6 inches, culmen 0-95, wing 4-55, tail 4-9, tarsus 1-25. Hah. Mexico. a. Ad. sk. Cordova, Mexico. Purchased.
. Catalogue of the Birds in the British Museum. 29. CYANOCOUAX. 119 lores, feathers round the eye, cheeks, and ear-coverts black; fore- head and a faintly defined eyebrow greyish cobalt; entire throat whitish shaded -ndth purplish blue, with a small spot of black at the base of the chin, the gular patch margined below with a shade of blue-black ; all the rest of the under surface of body smalt-blue, the thighs and under wing-coverts rather more ashy ; bill and legs black. Total length 9-6 inches, culmen 0-95, wing 4-55, tail 4-9, tarsus 1-25. Hah. Mexico. a. Ad. sk. Cordova, Mexico. Purchased. 29. CYANOCORAX*. Type. Cyanocorax, Boie, Isis, 1826, p. 975 C. chrysops. Cyanurus, Sicaim. Faun. Birds, p. 495 ^(1831) \ Coromdeus, Cah. Mus. Hvin. Th. i. p. 224(1850) C. Head of Cyanocorax chrysofs. Range. Central and South America. * Obs. I agree with Messrs. Sclater and Salvin that Cyanurus of Swainson must be considered a synonym of Cyanocorax of Boie; but I arrive at this conclusion in a totally different manner from that adopted by these authors. Cyanurus was a composite genus, and included ten species, viz.:â1. crisfatus; 2. stelleri; 3. sordidtis ; 4. floridanus ; 5. coronatus; G. cyanopogon ; 7. pileatus ; 8. azureus â ; 10. cristatellus. Of these C. pileatus (\el chrysops) ought not to have been included, as it is the sole type of Boie's genus Cyanocorax (1826). In 1841, Mr. G. E. Gray removed C. formomis, as the type of his genus Calocitia; and in 1845 Strickland instituted his genus Cyanocitta, with C. crisfata as its type, but including also Nos. 2, 4, and 5 of Swainson's list. Of these latter C. floridanus as well as C. soi-didus were removed by Cabanis, in 1850, into his genus Aphclocoma; and therefore in the year 1850 there remained but tliree of Swainson's original Cyanuri, viz. G. cyanQpogon, C. azurcus (vel ccerukua, Vieill.), and C. criifafclhis (vel cyanoleucug, Max.). This last-named bird was chosen bv Cabanis i
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