1909 | Grinnell —A New Cowbird. 281 
TABLE II. 
Molothrus ater ater. 
Ratio % 
of depth 
Depth of of bill 
Locality Date Wing Tail Tarsus Culmen Gonys bill at base to culmen 
Minneapolis, Minn. May 5, 1887 105.5 68.3 26.5 17.3 10.1 11.2 65 
Chicago, Ill. July 2, 1904 113.3 76.2 26.8 18.9 11.0 itileal 59 
Chicago, Ill. October 18, 1904 112.4 74.9 25.0 17.5 11.0 10.7 61 
Chicago, Ill. April 9, 1905 110.7 72.4 26.4 16.6 10.3 11.2 67 
Chicago, Ill. April 9, 1905 110.8 70.2 26.7 17.0 10.6 10.5 62 
Chicago, Il. April 29, 1887 108.8 67.3 26.0 18.0 11.0 11.0 61 
Stark Co., Indiana May 16, 1885 107.3 69.6 26.1) 18.2 10.8 10.5 58 
Stark Co., Indiana June 8, 1884 108.0 Touts 25.8 18.1 10.4 10.4 58 
Wayne Co., Mich. March 29,1891 107.8 71.4 25.3 17.0 ala lsat 10.5 62 
Jackson Co., Mich. April 2, 1888 113.7 77.6 25.8 17.8 11.0 al Its) 65 
Princeton, N. J. April 3, 1894 107.5 69.8 25.7 17.2 11.0 11.0 64 
Milford, Conn. May 4, 1889 105.0 69.5 24.5 17.0 10.1 pe) 65 
Average of the twelve males 109.2 paler; 25.9 17.5 10.7 10.9 62 
1 Univ. Calif. Mus. Vert. Zool. 
* Coll. G. Frean Morecom. 
® Coll. H. S. Swarth. 
4 Coll. J. Grinnell. 
TABLE III. 
Molothrus ater obseurus. 
Ratio % 
of depth 
Depth of of bill 
No. Locality Date Wing Tail Tarsus Culmen Gonys _ pill at base to culmen 
9691 Lano, Calif. April 21, 1908 101.1 67.7 24.7 16.9 9.9 9.3 55 
970! Lano, Calif. April 21, 1908 100.4 69.6 23.6 16.0 9.4 9.4 59 
9711 Mecca, Calif. April 18, 1908 98.9 69.2 24.0 16.0 9.6 9.0 56 
9731 Mecca, Calif. : April 27, 1908 102.4 69.0 24,2 syst 10.0 8.7 51 
3304% Fort Yuma, Calif. May 13, 1886 104.8 LT : 17.6 10.1 9.5 54 
222% Tiuachuca Mts., Ariz. July 8, 1896 94.8 63.6 16.0 9.2 9.0 56 
2746* Huachuca Mts., Ariz. May 7, 1902 102.0 72.8 16.1 9.4 9.0 56 
2813° Wuachuca Mts., Ariz. May 14, 1902 96.8 65.0 15.1 8.8 9.0 60 
3866° Huachuca Mts., Ariz. May 4, 1903 100.5 68.2 16.7 9.5 9.3 56 
3867° Huachuea Mts., Ariz. May 4, 1903 99.6 66.4 16.8 9.0 9.4 56 
4019 Tueson, Ariz. June 3, 1903 101.1 69.0 17.0 10.0 9.2 54 
Average of the eleven males 100.1 68.4 16.5 9.5 9.2 56 
Ratio % of average of 11 males of obseurus 
to average of 11 males of artemisiae 88 91 87 90 86 89 
Ratio % of average of 11 males of obscurus 
to average of 12 males of ater 92 95 93 94 89 84 
1 Univ. Calif. Mus. Vert. Zool. 
2 Coll. G. Frean Moreom. 
* Coll. H. S. Swarth. 
