| Diagnosis | Diagnosis: Head not conspicuously distinct from the body. Internasal one. Loreal absent. Dorsal scales smooth, in 15-15-15 rows, lacking apical pits. Anal plate divided. Subcaudals paired. Pupil round. Ventrals 144-185 in males ( = 164 ± 7.5, n = 81), 152-183 in females ( = 163.6 ± 6.8, n = 88). Total ventrals (venbtrals plus subcaudals) 196-245 in males ( = 221.4 ± 10.7, n = 81), 188-240 in females ( = 212.7 ± 10.8, n = 88). Subcaudals 32-71 in males ( = 57.4 ± 7.2, n = 81), 31-78 in females ( = 49 ± 7.3, n = 88). Supralabials 8/8 (n = 168), 9/8 (n = 2), 8/9 (n = 1) or 8/7 (n = 1), with 4-4 (n = 176), 4-5/4-5 (n = 2) or 4/4-5 (n = 2) entering the orbit. Infralabials 8/8 (n = 161), 9/9 (n = 6), 7/7 (n = 3), 8/9 (n=1), or 8/7 (n = 1), with 4/4(n = 161), 4/3 (n = 2), 3/3 (n = 2), or 4/5 (n = 1) contacting the first genials. Preoculars 1/1 (n = 172). Postoculars 2/2 (n = 171) or 1/1 (n = 1). Anterior temporals 1/1 (n = 171) or 2/2 (n = 1). Posterior temporals 1/1 (n = 168), 2/2(n=2),1/2(n=1)or2/1(n=1).Bodybands36-70inmales( =48±7.3,n=81),36-75infemales( = 48±7.3,n=88).Tailbands10-24inmales( =14.9±3.0,n=81),8-19infemales( =12.2±2.5,n=88). Data from hemipenial and skull morphology can be found in Zaher (1999) and Albuquerque (2002). The largest male and female we recorded were 752 mm and 806 mm total length, respectively. The smallest specimen measured, a female, had a total length of 188mm. The smallest male with rounded deferent ducts was 345mm in snout-vent length and 90mm tail length (MPEG 13826). The smallest female with well-developed eggs was 391mm in snout-vent length (MPEG 9483). We found significant sexual dimorphism in number of subcaudal scales and tail bands in all analyzed groups. Therefore, males and females were analyzed separately for these characters. The number of ventral scales varied significantly among the following groups: the group from north Brazil was significantly different from samples from Peru (H= 60.2878; P < 0.0001) and Guyana (H= 49.5422; P < 0.0001); the group from Peru was significantly different from samples of Venezuela (H= 69.4481; P < 0.0001) and Bolivia (H= 87.2750; P < 0.0001); the sample from Guyana was significantly different from sample of Bolivia (H= 76.5294; P < 0.0001). The group from north Brazil was significantly different from samples of Peru (H= 54.1590; P < 0.0001) and Guyana (H= 48.1972; P < 0.0001) in number of body-bands. The ANOVA revealed significant differences in subcaudals among geographic samples of females (F= 5.3977, P = 0.0004) but not for males (F= 1.3746; P = 0.2428) of the combined groups; females from Venezuela were significantly different from females of north Brazil, Guyana, Trinidad, and Peru. Tail-bands did not reveal differences for females (F= 2.2147, P = 0.0600) and males (F= 2.7031, P = 0.0267) of the combined groups.
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