AMPHIBIANS AND REPTILES. 263 



the triseriatus-septentrionalis section of the genus rather than to 

 the feriarum-nigritufi section. 



9. Rana sylvatica cantabrigensis (Baird). Wood frog. — This 

 species Avas common in the swamps l)etween Sand Point and Rush 

 Lake. It was only very rarely found on the sand ridges. I have 

 elsewhere (Ruthven, 1909, p. 116) given my reasons for referring these 

 specimens to the variety cantabrigensis. 



10. Rana pipiens Schreber. Leopard frog. — Common in suitable 

 habitats everywhere in the region studied. 



11. Rana clamitans Latreille. Green frog. — Although not as 

 abundant as the leopard frog, the green frog was found to be not un- 

 common in the ponds and swamps of the sand region, between Sand 

 Point and Hat Point, and individuals were occasionally found on the 

 beach of Saginaw Bay. It was also a common form on Stony and 

 North Islands. 



12. Rana catesbeana Shaw. Bull frog. — This species was found 

 in numbers in Rush Lake and in the county ditches near hv, but 

 nowhere else in the region. 



Sauria. 



13. Eumeces quinquelineatus (Linneaus). Blue-tailed skink. 



The expedition .secured a large series of this lizard, which is verv 

 fortunate in view of the fact that the species is apparently becoming 

 rare in the regions that it formerly occupied in the state, as the woods 

 are removed by lumbering and fire. We found it throughout the 

 sand region, from Sand Point to Hat Point, but it was much more 

 abundant on Sand Point, probablv for the reason that this region 

 has not been .so extensively burned over. A careful search failed to 

 discover it on Stony Island. 



In the woods of the sand region it was found on the drv ridges, 

 under and in decaying logs, where it fed on the insects that frecjuent 

 such situations. It was, however, much more common than elsewhere 

 under the drift logs on the fossil beaches, and also on the middle beach 

 on the pre.sent shore, at the extremity of Sand Point. The logs strewn 

 along the fossil beaches were in an advanced stage of decay, 

 and usually consisted of an outer sheU of better preserved wood 

 covering a mass of decomposed debris, the decomposition taking 

 place most rapidly next to the ground. This apparently furnished 

 a very favorable habitat for these lizards, great numbers of which 

 were found in the decomposed material when the outer shell of the 

 log had been removed. (PI. XVI.) 



The eggs were laid in the same material, the female generally 

 scooping out a small hollow in the bottom of which the eggs were 



