14 University of Michigan 



the edge of a garden. In another wheat field the Helming boys 

 picked up a prairie vole. 



Orchard habitat: 



Peromyscus leucopus iwvchoracensis. Northern white-footed mouse, i. 

 Microtiis pennsylvanicus pennsylvanicus. Pennsylvania vole. 2. 



No especial study of the mammal life of the orchard was made, 

 and no intensive trapping was done in the habitat. However, 

 the orchard cannot be included in any of the other habitats recog- 

 nized in the region. 



A northern white-footed mouse was caught alive by the 

 Helming boys in an orchard on July 16. A vole was seen to cross 

 a road in a small orchard on July 15; a trap was set and two 

 Pennsylvania voles secured, one a young of the year. 



Edificarian habitat:^ 



Blarina brevicatida taipoides. Short-tailed shrew, i . 



Peromyscus leucopus novehoraccnsis. Northern white-footed mouse. 2, 



Rattus norvegicus. Norway rat. 4. 



Mus musculus musculus. House mouse. 22. 



Sylvilagus floridanus mcarnsii. Mearns cottontail. 2. 



From time to time a few traps were set in the old farmhouse 

 and in the barn and other outbuildings of our camp. In these 

 buildings northern white-footed mice, Norway rats, and house 

 mice were taken. Several cottontails were seen in and under the 

 old barn. The Helming boys trapped a short-tailed shrew and 

 also house mice and a white-footed mouse in the basement of 

 their house. 



Records of the Number of Embryos 



All the females taken were examined for embryos, and the 

 results are here tabulated by species and dates. The term sub- 

 adult is used to indicate an individual which has reached adult 

 size, but which is still immature as shown by the pelage, unworn 



' L. R. Dice, Occasional Papers, Mus. Zool., No. 65. 



