Miller. — Microtus Breweri. 
PLATE 1. 
All figures li times natural size. 
Fig. 1. Microtus breweri (Baird). South Point Island, Mass. ($ad. No. 
1508, coll, of G. S. Miller, Jr.) 
1. Dorsal view of skull, 
la. Occipital view of skull. 
Fig. 2. Microtus pennsi/lvanicus (Ord). Nantucket Island, Mass. ($ad. 
No. 2440, coll, of G. S. Miller, Jr.) 
2. Dorsal view of skull. 
2a. Occipital view of skull. 
Fig. 3. Microtus pennsi/lvanicus (Ord). Delaware County, Penn, ($>ad. 
No. 1043, coll, of S. N. Rhoads.) 
3. Dorsal view of skull. 
3a. Occipital view of skull. 
