. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. Loreal Pattern 5 Loreal Pattern 6 Figure 1. Variation in scale patterns in the loreal region of species of Dipsas. Patterns 1 and 2: loreal squarish or polygonal; separate preocular present above loreal (pattern 1) or fused with prefrontal scale (pattern 2). Patterns 3 and 4: loreal rectangular, much longer than tall; separate preocular present above loreal (pattern 3) or fused with prefrontal scale (pattern 4). Patterns 5 and 6: rare patterns; pattern 5 is similar to pattern 2 but has a small triangular preo
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. Loreal Pattern 5 Loreal Pattern 6 Figure 1. Variation in scale patterns in the loreal region of species of Dipsas. Patterns 1 and 2: loreal squarish or polygonal; separate preocular present above loreal (pattern 1) or fused with prefrontal scale (pattern 2). Patterns 3 and 4: loreal rectangular, much longer than tall; separate preocular present above loreal (pattern 3) or fused with prefrontal scale (pattern 4). Patterns 5 and 6: rare patterns; pattern 5 is similar to pattern 2 but has a small triangular preocular separated from the posteroventral corner of the loreal; pattern 6 has an elongate preocular above the loreal and extending from the eye to the internasal. Patterns 1 and 2 are the common patterns in D. oreas, with patterns 5 and 6 less frequent. Patterns 3 and 4 are characteristic of D. elegans and D. ellipsifera. See text for discussion. between the sexes; see Tables 1—3). In these species, use of total segmental counts yields no insights that are not ap- parent from separate consideration of ven- tral and subcaudal numbers, specifically because the difference between the sexes with regard to total segmental counts is contributed entirely by the subcaudals; this fact is obscured when the subcaudal count is evaluated solely as a component of the total segmental count. On the other hand, in D. elegans, males have signifi- cantly greater numbers of ventrals and subcaudals than females, with virtually no overlap in the counts for either character between the sexes. As in D. oreas and D. ellipsifera, the use of total segmental counts in D. elegans reveals nothing that would not be seen by separate consider- ation of ventrals and subcaudals, each of which is strongly sexually dimorphic for this species. Moreover, it obscures the highly unusual pattern of sexual dimor- phism in ventral counts in D. elegans (dis- cussed later herein). Thus, the use of total segmental counts el
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