298 FIELD MUSEUM OF NATURAL HISTORY ORNITHOLOGY, VOL. I. 



parts; shorter wing and tail and different coloration and marking of the 

 outer tail feathers. 



Average measurements of four males: Wing, 181; tail, 130 mm. 



Average measurements of three females: Wing, 185; tail 132 mm. 



Cerchneis sparverius ochracea subsp. nov. 



Type from Colon, Tachira, western Venezuela. Adult male, No. 

 47129, Field Museum of Natural History. Collected by M. P. Ander- 

 son, December n, 1913. 



Greater portion of under parts deep ochraceous rufous, becoming 

 ochraceous buff on thighs and pale ochraceous buff on under tail coverts; 

 black spots on under parts confined to sides of body and nearly or quite 

 concealed' when wing is closed; crown dark slaty gray, darker than in 

 brevipennis, and about the same as in peruviana, but without the broad 

 black centers to the feathers; general color of upper wing coverts slaty 

 gray, paler than the crown; inner web of outer tail feather rufous, with 

 one subterminal band of black and grayish white tip; outer web of outer 

 tail feather ashy white, with several very narrow black streaks bordering 

 the shaft. 



Wing, 190; tail, 134; tarsus, 34 mm. 



In addition to the above described subspecies of Cerchneis spar- 

 verius, it is probable that at least two more new forms will ultimately 

 be added to the list. A key to the various subspecies, giving their 

 known geographical distribution, together with critical notes regarding 

 the stability of certain distinguishing characters, will be given in the 

 detailed report of the collections now being prepared. 



Otus choliba margaritae subsp. nov. 



Type from Margarita Island, Venezuela. Adult female, No. 38808, 

 Field Museum of Natural History. Collected by J. F. Ferry, March 3, 

 1909. 



Similar to 0. c. crucigerus from Guiana, but smaller and somewhat 

 paler and the quadrate pale markings on outer primaries much more 

 white. 



Wing, 150; tail, 85; tarsus, 29 mm. 



In 1909* I called attention to the small size of the specimens of this 



bird from Margarita Island, but hesitated to separate it subspecifically. 



Since then more material has been secured. The Margarita owl is 



smaller and paler in general coloration and the markings on the primaries 



* Field Mus. Nat. Hist. Publ., Ornith. Ser., I, 1909, p. 242 (Pisorhina choliba). 



