REPTILES. 



109 



green snake, water snake) 15%; field mice 22%; bird eggs (robin) 

 8%; rabbits 4%; voles 4%; frogs (green frog, wood frog) 7%%; 

 birds 4%; mammals miidentified 7%; larvae of Royal Moth 3%%. 

 Atkinson (1901, 147) records a Aveasel in the stomach of a Pennsyl- 

 vania specimen. 



Fig. 39. Distribution of Bascanion constrictor. 

 Horizontal ruling, specimens examined; vertical ruling, reports only. 



The writer has never been able to induce captive specimens of 

 this snake to eat toads or frogs but that they prey on these forms 

 to some extent is proved by the observations of Surface. It will 

 probably be found, however, that amphibians form a very minor 

 part of the food. Also as regards insects it is doubtful if the blue- 

 racer preys on any of these directly except possibly the large 



