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200 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST. are yellow, 11-16 scales long, and include faint indications of small black bands before and after each large black band; there are two black bands on the tail; the snout is pale yellowish white to the posterior third of prefrontals and contacts the black head-cap that extends nearly to posterior edge of parietals. These specimens agree well with the specimens reported by Bogert and Oliver (1945:371-74) in all characters except coloration. As pointed out by Zweifel and Norris (1955:244), and supported by additional material from Sonora (Nickerson and Heringhi, 1966:136- 138), the color pattern is variable. Specimens are known that are unicolor, that have one, two, or several dyads, and that are ringed in no definite color arrangement. The dyad may be two black rings separated by a white ring or two white rings separated by a black ring. These color patterns could provide interesting material for a study of natural selection and mimicry, especially with the sympatric occurrence of two potential models, Micrurus distans and Micruroides euryxanthus. Stickel (1943:111) remarked that "the color pattern of Procinura is developed along a different line than that seen in any described form of Sonora." Wright and Wright (1957:672-73) discussed the many color variations of Sonora episcopa. The other character mentioned by Stickel to separate Procinura from Sonora is the modified caudal scales. We agree with Bogert and Oliver (1945:374) that the recognition of a monotypic genus based on a single character tends to obscure its relationship with Sonora. One specimen (LACM 28714) contained the remains of a scorpion and a terrestrial orthopteran. Distribution in Sinaloa.—Known only from the northern lowlands. See Fig. 81. Specimens examined. •—13 km. S Cerro Prieto onhwy. 15 (* LACM 28714); 46.6 mi. (by hwy, 15) N Culiacan (*UAZ 16533). Storeria storerioides (Cope) Tropidodonium storerioides Cope, Proc. Acad. Nat. Sci. Philadelphia, 17: 199, 1865 (based on four specimens from the "Mexican plateau between the eastern ranges and the valley of Mexico"). Storeria storerioides, Carman, Mem. Mus. Comp. Zool., 8:29, 1883. Remarks.—One male has 129 ventrals, 41 subcaudals, 15-15-15 dorsal scale rows, 5-5 supralabials, 7-7 infralabials, 2-2 preoculars, 2-2 postoculars, 1 + 2/1 + 2 temporals, and labials two and three entering the eye on each side. This specimen was caught in pineoak forest on August 5, 1963; a heavy rain fell on the previous day.
AMPHIBIANS AND REPTH.ES OF SINALOA, MEXICO 201 Distribution in Sinaloa.—Known only from the lower montane dry forest of the sourthern highlands. See Fig. 78. Specimen examined.—19.2 km. NE Santa Lucia, 1935 m. (* KU 78922). Additional record.—-9.6 mi. SW El Palmito (UMMZ 123036). Sympholis lippiens Cope Sympholis lippiens Cope, Proc. Acad. Nat. Sci. Philadelphia, 13:524, 1862 (type locality, Guadalajara, Jalisco). Remarks.—Six specimens have 207-227 (214.3) ventrals; 15-23 (19.8) subcaudals; 228-241 (236.3) total ventrals plus subcaudals; 5-6 (mode 5) supralabials; 6-7 (mode 6) infralabials; 1-1 postoculars in three, 1-0 postoculars in two, no postoculars in one. All specimens have 19-19-19 scale rows; 1-1 preoculars; third supralabial entering orbit. Dorsal body bands number 17-23 (20) and are 5-13 scales long on the middorsal line. The light interspaces are 2-4 scales long on the middorsal line; there are black flecks in the light dorsal interspaces of three specimens. Caudal bands number 2 or 3. Humphrey and Shannon (1958:260), in a redescription of the species, suggested that specimens from Sinaloa and Nayarit (one each) might represent distinct subspecies. Hensley (1966:51) described a northern subspecies, Sympholis lippiens rectUimbus, as different from the nominal population in color pattern and head scutellation. Specimens from Sonora and northern Sinaloa generally have a straight anterior margin of the white nuchal collar across the posterior edges of the parietals. Most specimens from southern Sinaloa and Nayarit have a loop-like extension of the light nuchal collar onto the frontal as figured by Hensley (1966:51). A specimen (LACM 6501) from near Mazatlan and a specimen (CSCLE 1389) from near San Bias, Nayarit, have a white spot on the frontal scale but a straight anterior margin of the nuchal collar. Hensley (1966:50,54) interpreted this white spot as characteristic of S. I, lippiens. Two specimens from north of Mazatlan (KU 73628; UAZ 16309) have the same collar pattern as that figured for S, I. lippiens from near Tepic, Nayarit (Hensley, 1966:51). This variation in the southern segment of the population suggests a clinal trend northward, from the looped to the straight collar margin, There is no definite break in this character but rather a 240 kilometer range of the intermediate collar patterns. There is also some variation in the nuchal collar in northern specimens (Hensley, 1966:53). The ventral pattern varies in the condition of the dark bands on the ventrals. In some speci-
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