. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SlBYNOMORPHUS (COLUBRIDAE) IN PERU AND ECUADOR • Cadle 251 plates. Anal single. Subcaudals 67-73 (av- eraging 69) in males, 56—66 (averaging 62) in females. Loreal and prefrontal border- ing anterior edge of eye (no separate pre- ocular); loreal longer than tall. The first su- pralabial usually makes broad contact with the loreal (occasionally only narrow con- tact); supralabials 2 and 3 also border the loreal. Postoculars 2 (occasionally 3). Pri- mary temporals 2 or 3, secondary tempo- rals usually 3 or 4 (r
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. SlBYNOMORPHUS (COLUBRIDAE) IN PERU AND ECUADOR • Cadle 251 plates. Anal single. Subcaudals 67-73 (av- eraging 69) in males, 56—66 (averaging 62) in females. Loreal and prefrontal border- ing anterior edge of eye (no separate pre- ocular); loreal longer than tall. The first su- pralabial usually makes broad contact with the loreal (occasionally only narrow con- tact); supralabials 2 and 3 also border the loreal. Postoculars 2 (occasionally 3). Pri- mary temporals 2 or 3, secondary tempo- rals usually 3 or 4 (rarely 2), tertiary tem- porals usually 3 or 4 (rarely 5). Supralabi- als 6 with 3-4 touching the eye (rarely 7 with 3—4 touching the eye). Infralabials usually 10 (range 8-11). One pair (N = 17 specimens) or two pairs (N = 1) of infra- labials in contact behind the mental. Chin shields in three pairs (N = 11) or two pairs (N = 3). Maxillary teeth 12-14 (N = 6). The consistency of the fused preocular- prefrontal is remarkable in this species com- pared with some other Dipsadini (, Si- bynomorphus oneilli, S. petersi, S. vagrans, and various Dipsas spp.; Table 1; Cadle, 2005; Cadle and Myers, 2003). No separate preocular is present in any specimen. Three specimens have unusual configurations of the loreal and surrounding scales: in MUSM 19236, the loreal is expanded posteriorly so that die prefrontal contacts the eye very nar- rowly; MUSM 3137 and MUSM 2173 show the same condition on one side only; addi- tionally, on the contralateral side of MUSM 2173, the loreal contacts the supraocular, oc- cluding contact between the prefrontal and eye. A few other variations were observed: one specimen (MUSM 19236) has an irreg- ular row of suboculars on the left side sep- arating the supralabials from the eye, and a single subocular on the right side of the ho- lotype is formed by horizontal division of the third supralabial (see Carrillo de Espinoza, 1974, fig. 4). No consistent
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