. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 236 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 29. Sibynomorphus vagrans Paratype (MCZ 17442). Male, 230 mm SVL merited posteriorly (Figs. 28, 29). The an- terior crossbands are widest middorsally (generally spanning 5—9 middorsal scale rows) and narrower laterally (spanning 3— 6 dorsal rows). The bands in some speci- mens have a distinctly darker brown nar- row border (Figs. 28-30). Bands extend ventrally to the outer edge of the ventral scales. The first dorsal crossband is sepa- rated
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 236 Bulletin Museum of Comparative Zoology, Vol. 158, No. 5. Figure 29. Sibynomorphus vagrans Paratype (MCZ 17442). Male, 230 mm SVL merited posteriorly (Figs. 28, 29). The an- terior crossbands are widest middorsally (generally spanning 5—9 middorsal scale rows) and narrower laterally (spanning 3— 6 dorsal rows). The bands in some speci- mens have a distinctly darker brown nar- row border (Figs. 28-30). Bands extend ventrally to the outer edge of the ventral scales. The first dorsal crossband is sepa- rated from the dark spotting on the top of the head by a distinct narrow (2 scales or less) whitish collar just posterior to the mouth commissure; the collar connects to the pale gular region on each side and forms a characteristic obtuse angle mid- dorsally with the vertex directed posteri- orly (Fig. 30). In MCZ 17447, the first crossband behind the head is interrupted middorsally and thus forms an elongated blotch on each side of the neck; the cross- bands in other specimens are complete across the dorsum. The dorsal ground col- or is dull grayish brown. The venter of most specimens is immaculate (dull gray- ish or whitish), but some specimens have a variable amount of dark brown flecks or spots, especially concentrated toward the outer edges of the ventral scales. The top of the head is ornately marked with irregular dark brown spots and blotches (Fig. 30). A consistent feature of the head pattern is a broad, irregular band extending across the posterior edge of the prefrontals, curving over the canthus, and extending ventrally to the top half of the loreal scale (Figs. 30, 31). This band is in- terrupted at the suture line between the prefrontals in some specimens (Fig. 30, lower left) and occasionally on the lateral portion of the prefrontals on one or both sides (Fig. 30, upper right). Nonetheless, it is a consistent feature of head pattern in all the specimens examined. T
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