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160 UNIVERSITY OF KANSAS PUBLS., MUS, NAT. HIST. ventral counts reported here are generally lower than those reported by Bogert and Oliver (1945:360) for eight specimens from southern Sonora and by Fugler and Dixon (1961:12) for one specimen from central Sinaloa. All specimens examined have 8-8 supralabials and 8-8 infralabials; the temporal formula 1/2 + 2 occurs nine times, 2 + 1/2 twice, 2 + 2 occurs 17 times, 2 + 1 once, 2 + 3 seven times; the dorsal scale rows are 17-17-15 in five specimens, 17-17-16 in one, 18-17-15 in three, 18-17-16 in two, 19-17-15 in five, and 19-17-16 in one (excluding KU 73492-93). This large terrestrial species is active in the morning or late afternoon. Perhaps it is associated mainly with aquatic situations. Scott (1962:45) observed an adult specimen floating on a mat of aquatic vegetation in a large pond near Teacapan, apparently searching for frogs. Zweifel and Norris (1955:238) reported that specimens were more common near streams than elsewhere at Guirocoba, Sonora. Food items taken from stomachs included Sigmodon, Cnemidophorus costatus, Ctenosaura pectinata, Masticophis striolatus, and a 250 mm. fish. A large specimen, found at about 2200 hours on the road in northern Nayarit, was in the process of eating a Masticophis bUi~ neatus. Both of these snakes normally are considered to be diurnal. Two recently hatched young were found on August 16 near Teacapan and August 17 near Mazatlan. The smallest specimen measured 455 mm. total length. The longest specimen measured 2390 mm. total length. Distribution in Sinaloa.—Probably occurs throughout the state. See Fig. 62. Specimens examined.—2.5 km. N Badiraguato, 230 m. ("KU 83402); 2.5 km. S Coneepcion, 75 m. (" KU 63734; KU 63732-33); Isla Palmito del Verde, Send ("KU 73495-96); La Cruz ("LACM 6796-97); Mazatlan (KU 63419); 1.3 mi. N Mazatlan (' LACM 6799); 10.8 mi. N Mazatlan (CSCLB 1364); Plomosas, 760 m. (*KU 73494); Rosario, 150 m. (°KU 73492-93); 1 mi. S Rosario ("LACM 6800); San Ignacio (* LACM 6798); San Ignacio turnoff on highway 15 ("LACM 25900); 2.2 km. NE Santa Lucia, 1155 m. ("KU 78936); Teacapan (* LACM 6801-03); 8 km. N Villa Union, 140 m. ("KU 80747-48). Literature records.—Ahome (Bogert and Oliver, 1945:404); El Dorado (Fugler and Dixon, 1961:12). Additional records.—El Dorado (AMNH 90692-95); 15 mi. SE Escuinapa, 300 ft. (UMMZ 118784); 19.8 mi. S Escuinapa (CAS 95828); 24 mi. SE Piaxtla (SM 11131); Rosario (UIMNH 62810); 13.4 mi. N San Lorenzo, Rio (SU 23805). Drymobius margaritifems ftstulosus Smith Drymobius margantiferus fistuiosus Smith, Proc. U.S. Nat. Mus., 92:382, November 5, 1942 (type locality, Miramar, Nayarit).
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 161 Remarks.—Five specimens (three females and two males) have 1-1 preoculars, 2-2 postoculars, and 2+2/2+2 temporals. One female has 17-15-15 scale rows; the others have 17-17-15 rows. The three females and two males have, respectively: 143, 143, 145, 147, 144 ventrals; 8-9, 8-8, 8-9, 10-9, 9-9 supralabials; 9-9, 10-10, 10-9, 10-10, 10-10 infralabials; and 4-5/4-6, 4-5/4-5, 4-5/4-6, 5-7/4-6, 4-6/4-6 labials entering eye. One female has 127 subcaudals; all other specimens have incomplete tails. Eighteen specimens from near Teacapan have 142-151 (145) ventrals and 122-136 (129) subcaudals (Scott, 1962:48-50). The color and pattern of all specimens agree with the description by Smith (1942c:384). Drymobius margaritiferus is a diurnal species that is abundant in the vicinity of Teacapan. Individuals commonly were collected in the ecotone between pastureland and forest. This snake is primarily terrestrial, invariably retreating on the ground. A specimen from San Ignacio was shot about 1.5 meters above the ground in a bush. Two snakes were found copulating in the forest on March 30. Two females each contained six well developed ova without shells on June 12 and in early August (Scott, 1962). Distribution in Sinaloa.—Throughout the southern half of the state below 500 meters, and northward along the foothills into southern Sonora. See Fig. 63. Specimens examined.—6 km. E Cosala, 460 m. (• KU 73498); 17.9 mi. S Escuinapa (CSCLB 1365); 30.3 mi. S Escuinapa (CSCLB 1366); Isla Palmito del Verde, middle ('KU 73499-501); Isla Palmito del Verde, S end {"KU 73502); Mazadan (JRM 1099); San Ignacio (LACM 6804); Teacapan (LACM 6805-15, 7237-39); 3 mi. NE Teacapan (LACM 6816-17); 1 mi. E Teacapan (LACM 6818); 2.5 mi. E Teacapan (LACM 6819). Literature record,—Presidio (Boulenger, 1894:17). Additional records.—El Dorado (AMNH 90696-98); Escuinapa AMNH 3477-79); 2.7 mi. N. Escuinapa (FAS 14469); 5 mi. N Mazatlan (AMNH 19596), Elaphe triaspis intermedia (Boettger) Pityophis intermedium Boettger, Ber. Offenb. Ver. Nat., 22:148, 1883 (type locality, "Mexico"; restricted to Hacienda El Sabino, about 20 miles south of Uruapan, Michoacan by Dowling, Zoologica, 45:74, August 15, 1960). Elaphe triaspis intermedia: Mertens and Dowling, Senckenbergiana, 33:201, November 15, 1952. Remarks.—Two males have 8-9, 8-8 supralabials; 10-10, 10-10 infralabials; 248, 244 ventrals; 110, 101 subcaudals; 80, 84 dorsals (totals of three counts—neck, midbody, anterior to anus). Four females have 8-8, 8-8, 8-9, 9-9 supralabials; 9-9, 10-10, 10-9, 10-10 infralabials; 261, 268, 269, 275 ventrals; 86, 97 subcaudals (excluding
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