OCT 24 1927 Us 1^ TRANSACTIONS OF THE SAN DIEGO SOCIETY OF NATURAL HISTORY Vol. V, No. 7, pp. 83-86 October 10, 1927 A NEW LOUISIANA HERON AND A NEW ROUND-TAILED GROUND SQUIRREL FROM LOWER CALIFORNIA, MEXICO BY Laurence M. Huey Among some of the more recent specimens secured in Lower California by representatives of the San Diego Society of Natural History, which, under special permit from the Mexican government, has been conducting field work in that territory for several years, are a series of breeding Louisiana herons and a series of round-tailed ground squirrels that are markedly different from the forms hitherto known. Proposed new names for them, together with their descriptions, and supplementary remarks, are here presented. Hydranassa tricolor occidentalis, subsp. nov. Western Louisiana Heron Type. — From Scammon Lagoon, Lower California, Mexico, lat. 28 04' north, long. 114° 05' west; no. 10644, collection of the San Diego Society of Natural History; male, breeding; collected by Laurence M. Huey, skinned by George G. Cantwell, on May 25, 1926. Subspecific Characters. — Similar to Hydranassa tricolor ruficollis (Gosse), but has larger wing, tarsus, middle toe and beak; also, the neck has a much greater area of purplish maroon, which extends from the occipital region down the full length of the neck on either side. Measurements. — H. t. occidentalis: Averages and extremes of nine adult breeding males (including the type): wing, 268.5 (258.0-281.0) ; tail, 86.2 (82.1-90.0); tarsus, 100.7 (94.1-105.9); middle toe, 69.6 (64.7-72.9); culmen, 104.2 (97.3-107.8) . Averages and extremes of six females (including one sub-adult): wing, 253.0 (245.0-265.0) ; tail, 81. 6 (78.8-85.4) ; tarsus, 92.9 (91.2-
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