. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 106 Bulletin Museum of Comparative Zoology, Vol. 158, No. 3. Figure 19. Variation in color pattern of adult female Dipsas oreas (Cope) from the Rio Zana Study Site (Cajamarca de- partment, Peru). Top: ANSP 31777 (548 mm SVL). Bottom: ANSP 31784 (551 mm SVL). pression of the contrast according to size is more variable. However, without larger samples and ontogenetic data on pattern changes, it is not possible to make defini- tive statements regarding sex or size dif- ferences in color pattern. It is also uncle
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 106 Bulletin Museum of Comparative Zoology, Vol. 158, No. 3. Figure 19. Variation in color pattern of adult female Dipsas oreas (Cope) from the Rio Zana Study Site (Cajamarca de- partment, Peru). Top: ANSP 31777 (548 mm SVL). Bottom: ANSP 31784 (551 mm SVL). pression of the contrast according to size is more variable. However, without larger samples and ontogenetic data on pattern changes, it is not possible to make defini- tive statements regarding sex or size dif- ferences in color pattern. It is also unclear whether the intrapopulational variation in color pattern at the Rio Zafia Study Site applies to other populations. Sample sizes for different ontogenetic stages and sexes from single localities are insufficient to dis- entangle these effects from geographic or random variation patterns. Nonetheless, no examples of specimens with extremely pale bands or relatively unicolor dorsums are available from localities other than the Rio Zana Study Site. Color and Pattern in Preservative. Pre- served specimens retain the major pattern elements of live specimens, but colors be- come duller. Even specimens well over a century old (, the holotype and BMNH ; Fig. 14) have dark brown bands on a gray or grayish brown ground color. The lightening of the middle of the dark bands may become less evident in preservation, but most larger specimens retain even this sometimes subtle pattern characteristic. Most specimens of Dipsas oreas have a pair of elongate oval blotches on top of the head from the level of the eyes to the nape (Fig. 20). These are more or less discrete, depending on how much additional black pigment occurs atop the head. Within the Rio Zana population, there is variation in the prominence of the blotches, just as in overall dorsal pattern (Fig. 20). Nonethe- less, the characteristic form and presence of these cephalic blotches is a useful iden- tifying characteri
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