Snake Food Habits 123 



previous residue. A specimen that was feeding regularly and frequently 

 would pass all residue through without appreciable delay. This feature, 

 using a "marker" meal, was found to be useful in roughly gauging "total 

 digestive time" at average summer temperatures. The later ingestion of a 

 "chaser" meal helps to ensure that the marker meal does not dally along 

 the way. The observer, of course, must experiment a bit to see whether 

 the marker material is all being voided at one time. 



ACKNOWLEDGMENTS. — I am indebted to many persons for the con- 

 tribution of specimens, especially the late J. Oscar Gant and Rob B. 

 Knox, and also to Ruben T. Mcintosh, Tom Daggy, James D. Brown, 

 James Gant, C. K. Bartell and John Lammers. Tom Daggy was kind 

 enough to identify many of the insects. Some of the field trips on which 

 specimens were collected were partially supported by Davidson College 

 Faculty Research Funds. 



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