FIGURE 2. Occlusal view of lower first molar of arvicoline rodents from Anza-Borrego Desert State Park. The top of the figure is anterior. 2.1, ABDSP(LACM 1942/V8252, right m1, Lasiopodomys morphotype; 2.2, ABDSP(LACM) locality indeterminate/V24540, right m1, Microtus sp. with 5 closed triangles; 2.3, ABDSP(LACM) 68123/V24828, left m1, Microtus (=Terricola) meadensis. Gray lined area is broken and at a lower level than the rest of the illustrated surface. Dashed lines indicate indeterminate trace of enamel. Scale equals 2 mm.