. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 244 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 35. Sibynomorphus vagus from Huancabamba, Cajamarca Department, Peru (MCZ 17422). Male, 291 mm SVL. to S. vagus in ventral counts (Table 1) but has bold, well-defined anterior crossbands that are much broader than the interspac- es (Figs. 28, 29), has more subcaudals (80— 87 in males, 72—79 in females), and has a longer tail than S. vagus (Table 1). Siby- nomorphus oligozonatus differs from S. vagus in having well-defined bold anterior crossb
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 244 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 35. Sibynomorphus vagus from Huancabamba, Cajamarca Department, Peru (MCZ 17422). Male, 291 mm SVL. to S. vagus in ventral counts (Table 1) but has bold, well-defined anterior crossbands that are much broader than the interspac- es (Figs. 28, 29), has more subcaudals (80— 87 in males, 72—79 in females), and has a longer tail than S. vagus (Table 1). Siby- nomorphus oligozonatus differs from S. vagus in having well-defined bold anterior crossbands that are much broader than the interspaces (Figs. 1, 2, 4, 5) and a relative- ly unpatterned venter (heavily marked in S. vagus), and in lacking a preocular scale (present in S. vagus). Sibynomorphus pe- tersi and S. williamsi have >160 and >170 ventrals, respectively (sexes combined), and different color patterns. Male and fe- male S. oneilli have 152-168 and 163—173 ventrals, respectively. Description Size and Scutellation. Descriptive data for Sibynomorphus vagus are presented in Table 1. The largest specimen is a male, 483 mm total length, 368 mm SVL; the largest female is 408 mm total length, 326 mm SVL. Tail 23-24% of total length in males, 20—21% of total length in females. Body only slightly compressed. Dorsal scales in 15—15—15 rows, smooth. The ver- tebral row is very slightly broader to about times as broad as the paravertebral rows. Ventrals 144—152 (averaging 149) in males, 151—158 (averaging 154) in females. Anal single. Subcaudals 60-65 (averaging 63) in males, 56—60 (averaging 57) in fe- males. Loreal and preocular bordering eye (preocular superior to the loreal). Loreal longer than tall. Postoculars 2 (rarely 1). Primary temporals usually 1 (rarely 2). Secondary temporals 2 (rarely 3). Tertiary temporals usually 2 (range 0—3). Suprala- bials 7 or 8, usually with 4—5 bordering the eye (occasionally 3—4). Infralabials usuall
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