Scale counts to distinguish sex

[jdixon at WFSCGATE.TAMU.EDU]

I am looking for a reference (decades old) for distinguishing the sex of a
snake by subtracting caudals from ventrals.  If anyone out there can help
me find the citation for this article, I would appreciate it very much!

Many thanks to Taxacom folks for the help!

Jim Dixon, Professor Emeritus
Wildlife and Fisheries Sciences
Texas A&M University
jrdixon at tamu.edu