You are bidding on a new soft cover book called A Systematic Study of the Neotropical Vine Snake Oxybelis aeneus (Wagler) by Edmond D. keiser. This is 7" x 10" with 51 pages from 1974 .  The nomenclatural history of Oxybelis aeneus is reviewed . Analyses of geographic , ontogeneric , sexual and individual variation are presented for scutellation , head and body measurements , dentition , certain cranial bones , hemipenes and color patterns .This paper examined 1235 specimens including extant type specimens . Also includes a key to the species , 15 tables , b+w photos and maps.  This is in excellent condition .