Sept., 1907 CATALOG OF BIRDS COIvI^ECTED IN MIDDI.E LOWER CALIFORNIA 137 



Asio wilsonianus (I^esson). One female, Rosario, November 14. 



Bubo magellanicus pacificus (Cassin). Two specimens, male and female, 

 Rosario, November 18. These were, without doubt, migrants or winter visitors, 

 as the breeding bird of the region is B. in. elachistus . 



Bubo magellanicus elachistus (Brewster). Three specimens, both sexes, 

 Rosario, November. The five skins of Great Horned Owls listed above were care- 

 fully identified for us by Nelson and Oberholser, and there is no question of the 

 correctness of the identification. Nelson took B. m- elachistus in the same gen- 

 eral region in the summer, and it would appear to be the breeding form of the 

 Peninsula of Lower California north at least to San Quintin. 



Speotyto cunicularia hypogaea (Bonap.). Eight specimens, both sexes, Rosario, 

 November, and San Jabier, March. 



Strix pratincola Bonap. Seven specimens, both sexes, Rosario, October and 

 November, and San Andris, February 29. This latter bird, a female, had an ^^^ 

 in the oviduct nearly ready to be laid. 



Phalaenoptilus nuttallii nitidus Brewster. Two adults, male and female, 

 Rosario, November 1 and November 12. 



Calypte costae (Bourc). Four adults, three males and a female, San Jabier 

 and Rosarito, February 22 to April 1. 



Pyrocephalus rubineus mexicanus (ScL). One female, Santana, March 24. 



Empidonax difficilis Baird. Two males, Santana, March 18 and March 20. 

 These are probably migrants as they are certainly referable to difficilis and not to 

 cilicritiiis. 



Empidonax griseus Brewster. Two males, Santana, March 12 and 14. 



Say ornis saya (Bonap.). Four adults, both sexes, San Jabier, San Andris 

 and Rosarito, February 23 to March 30. 



Say ornis nigricans (Swains.). Three adults, males, Santana, March 11 to 

 March 20. These birds have the under tail coverts nearly wholly white and repre- 

 sent S. nigricans seniiatra (Vigors), if that form is recognized as a subspecies. 

 We, however, are rather inclined to agree with the opinion of Brewster that the 

 characters are too slight. Like Brewster's skins from the Cape Region, these 

 Santana specimens have rather large bills. 



Myiarchus mexicanus « pertinax (Baird). Thirteen adults, both sexes, 

 Rosarito, Santana and San Jabier, March. These skins are all referable to the 

 Cape St. Lucas form, differing from true mexicanus in grayer back and nape and 

 much larger bill. 



Tyrannus vociferans Swains. One adult female, Santana, March 16. 



Otocoris alpestris enertera Oberholser. Nine adults, both sexes, Rosarito and 

 San Jabier, February and March. 



Mimus polyglottos leucopterus (Vigors). Twenty-six adults, both sexes, 

 Santana, San Jabier and Rosarito, March and April. 



Oroscoptes montanus (Towns.). Twenty-nine specimens, both sexes, Santana, 

 Rosarito, San Jabier, February 23 to April 1. 



Brewster states that two specimens examined by him from La Paz were "larger 

 and much deeper colored" than birds from Texas. The present series shows some 

 variation in color, but on the whole we can see no decided difference either in size 

 or color between it and specimens from New Mexico, Texas, etc., when skins in 

 the same condition of plumage are compared. 



a Osgood [A/ik, Vol. XXIV p, 219, April, 1907) has shown from his examination of Kaup's type that the Ash- 

 throated Flycatcher is A/, tnexicanus, and that M. cooperi is the name of the bird we have been calling Myiarchus 

 mexicanus. 



