LIFE HISTORIES OF NORTH AMERICAN DIVING BIRDS. 85 
October 27. Wyoming: November 10. Missouri: September 22 to 
November 2 (formerly). Kansas: September to November. North- 
ern Arizona: September. Oregon: Fort Klamath, November 7. 
Lower California: San Jose del Cabo, October 18. Jalisco: Ocot- 
lan, September 28. 
Casual records.—Indiana: May 19 and November 5. Wisconsin: 
Several’ spring specimens. Illinois: Lake Michigan, winter (?). 
Michigan records are discredited. 
Egg dates—North Dakota and South Dakota: 41 records, April 
29 to July 23; 21 records, June 4 to 27. Colorado: 19 records, May 
10 to July 20; 10 records, May 28 to July 6. California: 14 records, 
April 22 to August 2; 7 records, June 8 to 19. Saskatchewan: 9 
records, June 10 to 26; 5 records, June 13 to 22. Oregon and Wash- 
ington: 9 records, May 3 to July 5; 5 records, June 1 to 12. Utah: 
38 records, April 22, June 20 and July 2. 
COLYMBUS DOMINICUS BRACHYPTERUS Chapman. 
MEXICAN GREBE, 
HABITS. 
As this little tropical species, the smallest of the grebes, is the 
only one of the North American grebes that I am not familiar with 
in life, I must draw wholly from the observations of others for an 
account of its life history. Unfortunately, published notes on its 
habits are very scanty, so the story will be short and incomplete. 
Prior to 1899 the San Domingo grebe (Colymbus dominicus) stood 
on our Check List, as found in the West Indies, southern Texas, 
Mexico, and Lower California, as well as in tropical South America. 
But Frank M. Chapman (18995) discovered certain. geographical 
varieties of the species worthy of recognition in nomenclature and 
separated it into three subspecies. His description separates the 
Mexican form, which also ranges into Texas and Lower California, 
from the West Indian bird under the name of brachypterus, having 
a much shorter wing and a smaller bill. This seems to be a well- 
marked subspecies in which the characters are constant. 
Mr. Vernon Bailey (1902) observes: 
These tiny grebes are as common in the ponds of southern Texas as the dab- 
chick ig the North. In open water they bob on the little waves, and in quiet 
pools where the willows overhang the banks swim and dive among the sedges 
and pink water lilies. When not seeking food below the surface of the water 
they usually keep close to some cover, and in the middle of the day if not 
hidden in the sedges are found sitting close under the shore grass or in the 
shade of a bush or low-hanging tree. 
Nesting.—Mr. Frank B. Armstrong, who has collected many sets 
‘of eggs of this grebe near Brownsville, Texas, wrote to Major Ben- 
55916—19—Bull. 107 4 
