12 Mr. R. Ridgway on the Genus Glaucidium, 



A. Nostril opening iu the middle of the cere. 



a. Sides of the breast distinctly spotted. 



1. G. GNOMA. Coloui- varj'ing from brownish plumbeous to reddish 



umber. Markings on the pileum guttate or circular. Tail dusky 

 greyish brown or blackish dusky ; bands white, not complete, 

 7-8. Wing 3-30-4-00 inches, tail 2-40-2-80. 



2. G. JAiiDiNii. Colour varying from umber to dark sepia or bright 



ferruginous. JMarkings on the pileum larger, more generally 

 distributed, cordate or circular. Tail dusky black or dusky fer- 

 ruginous ; bands white and incomplete, 5-7, or clear rufous, 

 7-8 (" lansbergi "). Wing 380-4 -2.5, tail 2-55-3-00. 



3. G. NANUM. Colour varying from brownish gi-ey to reddish grey. 



INFarkings on the pileum partly linear and partly guttate. Tail 

 dusky brown ; bands clear rufous or reddish white, continuous, 

 8-12. Wing 3-85-4-60, taU 2'90-3-40. 



b. Sides of the breast not spotted. 



4. G. FEKEUGiNEUM. Colour varying from brownish grey to bright 



ferruginous. Markings on the pileum narrowly linear. Tail 

 dusky brown, brownish black, or ferruginous ; if banded, the 

 bands clear rufous, reddish white, or pure white ; if not 

 banded, the coloui- uniform bright rufous. Wing 3-50-4-GO, tail 

 2 •20-3-50. 



5. G. PUMiLtJM. Colour varying from umber to rich chocolate, the 



pileum abruptly greyer. Markings on the pileum minute, cir- 

 cular or elliptical. Tail black ; bands white, not continuous, 

 4-5. Wing 3-30-3-70, tail 2-10-2-40. 



B. Nostril opening in the anterior edge of the cere. 



6. G. sur. Colour greyish brown. Markings of the pileum dia- 



mond-shaped. Tail dusky brown ; bands continuous, white, 

 white and rufous, or rufous, 6-7. 



1. Glaucidium gnoma. 



Glaucidium passerinum, var. calif ornicum, Ridgw. Proc. 

 Boston Soc. N. H. May 1873, p. 94. 



Glaucidium gnoma, Sharpe, Ibis, Jan. 1875, p. 56, pi. i. 



Hab. Western Province of North America, from Puget 

 Sonnd to Arizona [Nat. Mus.) ; Colorado (C. E. Aiken) ; 

 Vancouver Island {fide Sharpe, I.e.); Tablelands of Mexico 

 {cab. G. N. Lawrence) ; Guatemala {fide Sharpe, I. c). 



This form is very much more nearly related to the G. pas- 

 serinum of Europe than to any of the other American species, 

 G. jardinii heing its nearest ally. After a very careful com- 

 parison of specimens, I find it to differ from its European 



