292 THE AMERICAN NATURALIST. [Vor. XXXV. 
TABLE IX. — DEPTH or BILL. 
AREA. MATERIAL. | Mops. | MEAN. STANDARD Dev. 
Entire region .| 126 males. 9.27 -- mm. 0.42 + mm. 
85 females. 8.95 -- mm. 0.41 + mm. 
Austroriparian .| 54 males. 10.0 mm. 9.54 -- mm. 0.38 -- mm. 
22 females. 9.2 mm. 9.32 -- mm. 0.37 + mm. 
Appalachian. .| 21 males. 8.8-9.0 mm. 8.95 + mm. 0.30 + mm. 
19 females. 8.8 mm. 8.90 + mm. 0.36 + mm. 
Campestrian. .| r9 males. 9.0 mm. 9.08 4- mm. 0.28 + mm. 
14 females. 8.8 mm. 8.8 + mm. 0.30 + mm. 
Sonoran . . .| 32 males. 9.0 mm. 9.12 + mm. 0.44 + mm. 
30 females. | 8.8-9.0 mm. 8.78 + mm. 0.36 + mm. 
CV. of 126 males = 4.57 +. CV. of 85 females = 4.61 +. 
P. E. M. [sub.] 126 males = + 0.0252 +. 
P. E. c [sub.] 126 males = + 0.0178 +. 
TABLE X. — MELANISM or Top OF HEAD. 
AREA. MATERIAL. Mone. | Mean. STANDARD DEV. 
Entire region . 144 males. 83.57 + 4. 3.00 + %- 
99 females. 83.66 + %. 3.19 + %- 
Austroriparian .| 57 males. 86%. 86.17 T5 1.69 + %- 
24 females, 88%. 87.25 + %. 1.81 + % 
Appalachian. . 33 males. 80%. 82.24 + %. 2.68 + f$. 
25 females. 80%. 82.32 + %. ($03 + % 
Campestrian. .| 21 males. 80%. 80.67 + %. 1.13 + fi 
17 females. 80%. 80.94 + %. 1.78 + %- 
Sonoran . . .| 33 males. 82%. 82.24 + %. 2.4 +% 
33 females. 82%. 83.45 + 4. 2.38 + % 
CV. of 144 males = 3-58 +. CV. of 99 females = 3.81 +. 
P. E. M. [sub.] 144 males — 4- o.1686. 
P.E. c [sub.] 144 males = + 0.119 +. 
