. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 196 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 2. Sibynomorphus oligozonatus. Dorsal and ventral views of BMNH (Loja Province, Ecuador). Female, 428 mm SVL The specimen illustrates the typical pattern in the known specimens: broad anterior dorsal crossbands, fragmented posterior bands, and relatively unpatterned venter. eo Carrion (Parker, 1930a, 1930b, 1932, 1934, 1938). Parker (1938) referred sev- eral specimens in this collection to "Dipsas mikanii oreas" (= Dip
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 196 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 2. Sibynomorphus oligozonatus. Dorsal and ventral views of BMNH (Loja Province, Ecuador). Female, 428 mm SVL The specimen illustrates the typical pattern in the known specimens: broad anterior dorsal crossbands, fragmented posterior bands, and relatively unpatterned venter. eo Carrion (Parker, 1930a, 1930b, 1932, 1934, 1938). Parker (1938) referred sev- eral specimens in this collection to "Dipsas mikanii oreas" (= Dipsas oreas; Cadle, 2005). Rather peculiarly for a moderately sized collection from this region, none of the snakes that Parker referred to D. oreas appear to represent that species. Instead, they comprise the single specimen here identified as Sibynomorphus oligozonatus and a larger series I identify as S. petersi (see subsequent species account).7 Parker (1938: 444) did not use BMNH collection numbers, but he noted that one of the fe- males "differs from other specimens in having a smaller eye, a higher and narrow- er rostral, and the first labial in contact with the loreal; it may possibly represent a distinct ; BMNH 7 Although Dipsas oreas is known from the same region as Carrion's collections (Cadle, 2005), the presence of Sibynomorphus in his collection and the apparent absence of D. oreas suggest that his collec- tions were from drier, more open habitats (as op- posed to humid forested habitats). Dipsas oreas is restricted to humid forests (Cadle, 2005), whereas species of Sibynomorphus in Ecuador and Peru gen- erally occur in subhumid to arid environments, such as dry deciduous forests or thorn forests, which pre- dominate in this region. matches the locality and characteristics given by Parker, including ventral and sub- caudal counts that are virtually identical to mine. AMNH 110587 is an adult male road- killed specimen collected by Char
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