Abstract
Specimens for this study were collected in the ecotonal regions between tropical deciduous forest and arid thorn scrub in southwestern Tamaulipas. This taxon is not common in riparian habitats. Captive breeding behavior for four pairs of Agkistrodon bilineatus taylori was observed between September and February. Young were born between June and November. Male combat behavior typical for several members of the genus Agkistrodon was observed on several occasions among five different pairs of captive male specimens. One instance resulted in death for one of the participants. Young are less colorful than adults; dramatic ontogenetic color changes exist in this taxon. Females typically have more ornate patterning and interstitial markings than do males. Both sexes become nearly black as old adults. The LD50 for A. b. taylori venom is 47 micrograms (I.P.) per 20 gm mouse.
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