. Bulletin of the British Ornithologists' Club. . FIGURE Distribution of the races of Cochlearius cochlearius in Mexico and Central America. Open squares, ^eledoni; circles, phillipsi; triangles, ridgwqyi (open triangles, localities reported in Dickey & Van Rossem 1938); squares, panamensis; hexagon cochlearius. Localities with vertical lines are type localities. Hatched region represents intergrade zone panamensis X ridgwqyi. TABLE Measurements in millimetres of adult Boat-billed Herons from Central America, with mean and standard deviation Males East Coast Mexico West Coast Mexico S. to
. Bulletin of the British Ornithologists' Club. . FIGURE Distribution of the races of Cochlearius cochlearius in Mexico and Central America. Open squares, ^eledoni; circles, phillipsi; triangles, ridgwqyi (open triangles, localities reported in Dickey & Van Rossem 1938); squares, panamensis; hexagon cochlearius. Localities with vertical lines are type localities. Hatched region represents intergrade zone panamensis X ridgwqyi. TABLE Measurements in millimetres of adult Boat-billed Herons from Central America, with mean and standard deviation Males East Coast Mexico West Coast Mexico S. to Isthmus of Tehuantepec Pacific coastal Chiapas (Mexico), Guatemala and Honduras East Coast Mexico West Coast Mexico S. to Isthmus of Tehuantepec Pacific coastal Chiapas (Mexico), Guatemala and Honduras wing chord 265-296 (281-9) SD 7-8n=28 259-273 (269-6) SD3-3n=14 262-283 (271-5) SD 6-6 n=16 268-281 (274-7) SD4-5n=15 258-273 (264-6) SD4-4n=10 255-274(268-3) SD6-9n=14 tail 110-122(114-8) SD3-5n=28 102-110 (106-6) SD2-2n=14 105-114(110-1) SD 3-3 n= 16 72-87 (79-9) SD3-2n=29 71-83(79-4) SD3-0n=16 71-83 (79-2) SD3-1 n=14 Females 108-116 (111-8) SD2-5n=16 100-107 (104-0) SD 3-4n=10 105-116 (109-4) SD3-0n=19 71-81 (74-7) SD2-6n = 15 73-78 (75-4) SD 1-9 n=10 66-78 (73-1) SD 3-2n=14 exposed culmen 78-92 (85-2) SD3-3n=29 78-88 (83-7) SD2-8n=16 78-87 (83-6) SD3-9n=14 72-84 (78-2) SD3-9n=16 76-82(78-6) SD l-8n=10 72-81 (76-7) SD2-7n=14 Cochlearius cochlearius ^eledoni Cancroma ^eledoni Ridgway (1885). Type locality, Mazatlan, State of Sinaloa, Mexico. Diagnosis: Pale "lavender" grey dorsally, forehead usually whitish, washed with pale-grey or buff: wing and tail shorter than in the birds of the Gulf coastal lowlands of Mexico. Range: Pacific coastal areas of Mexico from Mazatlan, Sinaloa, south at least to the Rio Papagallo, Guerrero (see Figure).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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