. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 214 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 12. Sibynomorphus oneilli. A nonbanded specimen from Huaylas in the Rio Santa valley (Pacific versant, Ancash Department). MUSM 2687 (female, 463 mm SVL). suture lines. Infralabials are dull whitish, unmarked. The dorsal pattern varies by individual. The first crossband is interrupted middor- sally in many specimens, forming a pair of blotches (much higher than wide) on the side of the neck (Figs. 8 [upper and lower right], 9, 11). Other cros
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 214 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 12. Sibynomorphus oneilli. A nonbanded specimen from Huaylas in the Rio Santa valley (Pacific versant, Ancash Department). MUSM 2687 (female, 463 mm SVL). suture lines. Infralabials are dull whitish, unmarked. The dorsal pattern varies by individual. The first crossband is interrupted middor- sally in many specimens, forming a pair of blotches (much higher than wide) on the side of the neck (Figs. 8 [upper and lower right], 9, 11). Other crossbands on the body are likewise sometimes interrupted middorsally. At least occasionally (, MUSM 3211; Fig. 8, lower left), virtually all of the crossbands are interrupted so that the dorsal pattern consists of a series of irregular narrow vertical streaks on the flanks, and in extreme cases (MUSM 2662), the crossbands are extremely frag- mented so as to give the appearance of an irregular pattern. In most specimens, the crossbands on the anterior quarter to third of the body are wider than more posterior crossbands (Figs. 8, 9). Occasionally (MUSM 2770, KU 212600) these anterior crossbands are twice or more the width of the posterior crossbands. Except for these anterior bands, most bands on the body are one scale row or less in width and are much narrower than the interspaces. As described above (New Material of Siby- nomorphus oneilli from Ancash and Lib- ertad Departments, Peru), two females and a male from the Rio Santa valley lack crossbands entirely and have irregular dark flecks over the dorsum (Fig. 12). There seems to be little or no ontoge- netic change in color pattern, as four spec- imens 203-280 mm total length had pat- terns similar to adults; one of these (MUSM 3089; 232 mm total length) had the highest number of dorsal bands re- corded (63), and these were formed by darkened scale edges rather than fully formed bands. Details of the dorsal patterns of KU 21
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