. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 7. Gular patterns in Stenocercus prionotus. Top, typ- ical throat pattern (oblique view) consisting of light and dark stripes that extend medially to the midline (USNM 193687). Bottom, specimen in which the ground color is lighter and therefore the contrasting pale stripes are less distinct (USNM 193685). Sexual Dimorphism. Stenocercus prion- otus does not exhibit strong sexual dimor- phism. Males and females attain approxi- mately the same size and have the same general pattern, but whether the colora- tion in
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 7. Gular patterns in Stenocercus prionotus. Top, typ- ical throat pattern (oblique view) consisting of light and dark stripes that extend medially to the midline (USNM 193687). Bottom, specimen in which the ground color is lighter and therefore the contrasting pale stripes are less distinct (USNM 193685). Sexual Dimorphism. Stenocercus prion- otus does not exhibit strong sexual dimor- phism. Males and females attain approxi- mately the same size and have the same general pattern, but whether the colora- tion in life reported above for adult males pertains to females as well is unknown. The vertebral crest is only slightly more developed in males than in females of the same population but this character shows strong clinal variation (northern popula- tions with higher crests; further discussed below). Other characters that sometimes vary between the sexes in Stenocercus show little variation in S. priontotus. Nei- ther standard meristic counts (Table 1) nor the relative development of the posthu- meral and postfemoral pockets (Types 4 and 1, respectively, in adults of both sexes and in subadults) show obvious sexual di- morphism. DISTRIBUTION PATTERNS IN STENOCERCUS PRIONOTUS Absence of Stenocercus prionotus from Lowland Localities in Eastern Fern. Sten- ocercus prionotus is widespread in the lowlands along the Andean front from northern Peru to northern Bolivia (Fig. 1). However, all Peruvian localities are close to the Andean foothills and south of the broad extension of the Cordillera Oriental separating the great bend of the Rio Mar- aflon from upper reaches of the Rio Hual- laga (Fig. 2). The absence of specimens in comprehensive collections from the Iqui- tos region (Dixon and Soini, 1986), Balta (Ucayali Department; specimens at LSUMNS and University of Arizona), and Cuzco Amazonico (Madre de Dios De- partment; Duellman and Salas, 1991) sug- gest that S. prionotus may be absent
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