. Bulletin. Science; Natural history; Natural history. ^',4 ^«i ii &; ^% «sia# ^« IP B. Fig. 5. Sulcate view of right hemipenis (L indicates lateral, M medial) of Thamnophis fulvus (A) and Thamnophis cyrtopsis collaris (B, incomplete drawing at right showing asulcate pair of hooks). T. fulvus. In addition, the hemipenis of T. c. collaris is adorned with another pair of enlarged hooks (about size of medial pair) more distal than the other pairs of hooks and on the asulcate side (Fig. 5B, right). The drawing of the hemipenis of T. c. collaris is based on an examination of three specimens (UT
. Bulletin. Science; Natural history; Natural history. ^',4 ^«i ii &; ^% «sia# ^« IP B. Fig. 5. Sulcate view of right hemipenis (L indicates lateral, M medial) of Thamnophis fulvus (A) and Thamnophis cyrtopsis collaris (B, incomplete drawing at right showing asulcate pair of hooks). T. fulvus. In addition, the hemipenis of T. c. collaris is adorned with another pair of enlarged hooks (about size of medial pair) more distal than the other pairs of hooks and on the asulcate side (Fig. 5B, right). The drawing of the hemipenis of T. c. collaris is based on an examination of three specimens (UTEP 3390-92) from Durango-Sinaloa, Mexico, all of which agree in the above-mentioned fea- tures; presumably these features obtain in specimens of T. c. collaris from Chia- pas and Guatemala. Of interest is the hemipenis of T. cyrtopsis cyrtopsis (UTEP 1701-02, 2889 from New Mexico and Texas) that resembles that of T. c. collaris in having two medial and three lateral basal hooks, but differs in lacking the distal asulcate pair. The hemipenial morphology of taxa of Thamnophis seems to vary primarily in the number, relative size and shape, and arrangement of the enlarged hooks. However, the significance of the differences noted between T. fulvus and T. c. collaris is uncertain, since the degree of variation within and between taxa of Thamnophis is unknown. Recorded elevations indicate an overlap in the altitudinal range of Thamnophis cyrtopsis collaris and Thamnophis fulvus. Thamnophis c. collaris occurs at rel- atively low elevations, but is reported as high as 2042 m (6700 ft) in Chiapas (UA 26572, 26576); elsewhere in Mexico the subspecies was reported near 2134 m (7000 ft) by Webb (1966:62), Thamnophis fulvus is a highland species with the lowest elevation recorded as 1636 m (5369 ft, KU 95786). Specimens of the two species are not recorded from the same locality, but are closely approximated in the vicinity of San Cristobal de las Casas, Chiapas, and Tejutla, Guatemala (se
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