Vol. 6] Miller: Avifauna of Pleistocene Cave Deposits. 395 



Measurements 



B. sin- B. virgini- 

 clairi anus 



Scoti- 

 aptex 

 nebulosa 



Tarsometatarsals — 



Total length 



Transverse diameter of head 



Least transverse diameter of shaft 



Least anteroposterior diameter of shaft 

 Diameter through trochleae 



16.0 mm. 14.4 

 10.5 7.8 

 6.1 5.1 



60.0 



17.6 



58.0 

 1 5.0 

 8.1 

 4.7 

 ] 7.0 



OTUS ASIO (Linnaeus) 



Known only by the shaft of a tarsometatarsals and the distal 

 ends of two humeri occurring in the material from Potter Creek 

 Cave. 



Two tarsometatarsi of this owl occur in the Samwel Cave 

 collection. One lacks the trochleae and the other the extreme 

 head, otherwise they are perfectly preserved and permit of 

 exact determination. The two may have belonged to the same 

 individual, as they were closely associated in the deposit and 

 they correspond perfectly in size. The specimens are slightly 

 less in size than a female of the Recent phase at hand, but the 

 difference is no greater than is readily ascribable to difference 

 in sex. 



A perfect tarsometatarsus of this species occurs in the Sam- 

 wel Cave material. Mr. Swarth of the University of California 

 Museum of Vertebrate Zoology kindly dissected out the tarso- 

 metatarsus of a male specimen in the museum collection so that 

 this rare material might be available for comparison. The cave 

 form is identical in every respect with the Recent specimen 

 except that it is slightly larger. Since the Recent specimen is 

 a male and the difference in length is but one and one-half milli- 



« 



meters, the fossil form may be safely considered as a female of 

 the same species. 



M K'ROPALLAS WHITNEYI (Cooper) 

 A single perfect tarsometatarsus from Samwel Cave rep- 

 resents this species, which is now confined to the arid regions 



ASIO WILSONIANUS (Lesson) 



GLAUCIDIUM GNOMA Wagler 



