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JJ2 CALIFORNIA ACADEMY OF SCIENCES [Oc. Papers Measurements of 6 Specimens in the Coljjection of the California Academy of Sciences Snout to anus 28 29 30 32 33 34 Width of head 11 13 11 12 13 13 Diameter of eye 3 3 3 4 3 4 Interorbital width 3 2 4 4 3 4 Snout to orbit 5 4 5 6 5 5 Fore limb 17 17 14 19 18 18 Hind limb 47 42 45 50 50 46 Length of foot 20 18 19 23 22 20 Habits.— Hyla arenicolor is found abundantly in many parts of southern California. In May, 1915, the writer collected numbers of this species in the river bed of the Tujunga River, Los Angeles County. Here they were found congregated in the crevices of the largest granite boulders strewn along the river bed. In some instances as many as 10 or 15 were taken from a single crevice. They were so compact in places that 6 or 7 individuals could be picked up at once. The protective coloration is excellent and a single tree-toad perched on the side of one of these boulders would almost defy detection. In June, 1923, this species was taken at 8,000 feet in the ice cold streams of Arroyo Encantada, San Pedro Martir Mountains, Lower California, Mexico. Distribution.— This tree-toad ranges from Texas west to the Pacific Ocean, and from southern Utah south in Mexico to Guadalajara and Toluca. It is known from Utah, Arizona, California, and Lower California. In Utah, it is said to be common about springs, irrigation ditches, and rapidly flowing streams in the region with drainage into the Colorado River. I know of no records of its capture elsewhere than in Washington County, where it has been taken near St. George and near Bellevue. In Arizona, it is widely distributed and has been collected in Coconino (north side of Grand Canyon on Mystic Spring Trail, south side of Grand Canyon on Bright Angel Trail, Oak Creek), Yavapai (Senator Mountains, Prescott, Fort Verde), Maricopa (Cave Creek), Navajo (White River Canyon), Graham (Graham Mountains at 8,200 feet). Pima (East Sabino Basin. Pima Canyon. Steam Pump 18 miles north from Tucson), Santa Cruz (Santa Rita Mountains at Gardner Canyon and east saddle of "Old Baldy" at 7,500 feet), Cochise (Huachuca Mountains, Ramsey Canyon. Fort Huachuca). counties. September 15, 1928
No. 16] AMPHIBIANS OF WESTERN NORTH AMERICA H^ In California, it has been collected in Ventura (three miles south from Nordhoff), Los Angeles (Las Flores, Santa Monica Mountains, Sierra Madre, Tujunga River, La Crescenta, Arroyo Seco Canyon near Pasadena, Little Rock Canyon San Gabriel Moun- West Fork San Gabriel River, Santa Anita Canyon, Placerita tains, Canyon, San Dimas Canyon, Dominguez Rancho), Riverside (Cabazon, Palm Canyon, and Oak Springs in the San Jacinto Mountains, Dos Palmos Springs, Deep Canyon and Carrizo Creek in the Santa Rosa Mountains, Soboba Springs), and San Diego (Warner Pass, Pine Mountain near Escondido, Julian, Witch Creek, Santa Ysabel, La Puerta, Mountain Springs, Mission Valley, Wildwood, Dulzura, Cottonwood, Barrett Dam, Japatul School), counties. In Lower California this tree-toad has been secured near Ensenada and in Arroyo Encantada, San Pedro Martir Mountains. Hyla regilla Baird & Girard Pacific Tree-toad Plate 18 Hyla regilla Baird & Girard, Pi-oc. Acad. Nat. Sci. Phila., VI, 1852, p. 174 (type locality, "Sacramento River, in Oregon and Puget Sound") ; Baird & Girard, Proc. Acad. Nat. Sci. Phila., 1853, p. 301; Girard, U. S. Explor. Exped.. Herpetology, 1858, p. 60, pi. III, figs. 13-18; Cooper & Suckley, Nat. Hist. Washington Terr., 1859, p. 304; Baird. Rep. Pac. R. R. Surv., X, 1859, Rept,, p. 12, pi. XXVIII, fig. 3; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 313; Cooprai, in Cronise, Nat. Wealth of Calif., 1868. p. 485; Cope, Bull. U. S. Nat, Mus., No. 1, 1875, p. 30; Streets, Bull. U. S. Nat. Mus., No. 7, 1877, p. 35; Yarrow & Henshaw, Ann. Rep. Chief of Engineers for 1878, Surv. W. 100th Merid., [Append. NN, 1878, p. 208; Brocchi, Bull. Soc. Philom., Ser. 7, 1, p. 127; Boulenger, Cat. Batrach. Salient. Brit. Mus., 1882, p. 374; Cope, Proc. Acad. Nat. Sci. Phila., 1883, pp. 20, 23, 25; Yarrow, Bull. U. S. Naf. Mus., No. 24, 1883, p. 171; Townsend, Proc. U. S. Nat. Mus., X, 1887, p. 241; Cope, Bull. U. S. Nat. Mus., No. 34, 1889, p. 355, fig. 89; Cope, Proc. Acad. Nat. Sci. Phila., 1893, pp. 181, 183; Stejneger, N. Amer. Fauna, No. 7, 1893, p. 222; Van Denburgh, Bull. U. S. Fish Commiss. for 1894, p. 207; Van Denburgh, Proc. Calif. Acad. Sci.. Ser. 2, V, 1895, p. 556; Test, Proc. U. S. Nat. Mus., XXI, 1898, pp. 477, pi. XXXIX; Van Denburgh. Proc. Calif. Acad. Sci., Ser. 3, Zool., IV. No. 1, 1905. pp. 3, 13, 23; Dickerson, Frog Book, 1906, p. 134, color pis. VIII, IX. pi. LIII; Mearns, Bull. U. S. Nat. Mus., No. 56, 1907, pp. 133, 138, 141; Taylor, Univ. Calif. Publ. Zool., VII, No. 10, 1912, p. 342; Hurter, First Ann. Rep. Laguna Marine Lab., 1912, p. 67; Van Denburgh & Slevin, Proc. Calif. Acad. Sci., Ser. 4, IV, 1914, pp. 135, 137, 144; Ruth-
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Occasional Papers OF THE CALIFORNIA
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To the memory of JOHN VAN DENBURGH
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CONTENTS PAGE INTRODUCTION 9 Synops
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No. 16] AMPHIBIANS OF WESTERN NORTH
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THE AMPHIBIANS OF WESTERN NORTH AME
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No. IS] AMPHIBIANS OF WESTERN NORTH
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No. 161 AMHHIBIANS OF WasTERN NORTH
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no. 16] amphibians of western north
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TRUSTEES, OFFICERS, COUNCIL AND MUS
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