Reproductive tissue was examined in 40 museum specimens of Oxybelis ae
neus from Arizona and the Mexican states of Sonora, Sinaloa, Nayarit,
Jalisco, Colima, Oaxaca and Chiapas. The results of this examination s
upport the premise that this species of vine snake exhibits a reproduc
tive cycle with sperm formation occurring in the spring and that clutc
h sizes for this species may be as large as eight.