•100 Sw \i;ru StOtHS - [$j| 



So t 1u n matter rested until recently. In the course of tho prepa- 

 ration oi a distributional list of the birds of Arizona it became 

 desirable that the status in Arizona oi these two species of bush- 

 tits, ptamoeus and lloi.Ji. be definitely settled, and all material 

 available was carefully scrutinized. In the course of this study 

 additional specimens were discovered which appeared to prove 

 conclusively the correctness of my previous assertion, that semfo- 

 u as a synonym of pUmbcus and not of Uoydi. 



The expedition which the University of California Museum of 

 Vertebrate Zobiogy sent to the Tine Forest Mountains of northern 

 Nevada in 1000. secured a large series of Psakripatus plumbeus. 

 Included therein are a number of birds in juvenal plumage, and a 

 proportion of these have the head marking of '* P. saniaritai" As 

 there was no question of P. '■'• Uoyth occurring in this region, this 

 was b conclusive demonstration that the young of plumbeus fre- 

 quently have more or less black on the head. The evident con- 

 clusion to he drawn from this was that " PsoMriparus santarii ." 

 occurring in a region where - is abundant, should he re- 



garded as the young of that species anil not oi . unless adults 



of the latter species also were taken in the same plaee. As far as I 

 knew there were no Arizona records ol other than oi the birds 



first described as " santwritat," but the possibility that adult speci- 

 mens of Uoydi had been taken within the state, and that their 

 capture was authority for the extension of ranee as given in the 

 Check-List caused me to make inquiry in this particular. 



Correspondence with Professor W, W. Cooke, of the Biological 

 Survey, elicited the faet that no such adults had been taken, and 

 that the inclusion of southeastern Arizona in the ranee l 

 was based entirely on the belief that " saMtarUai*' was the young of 

 that speeies. After examining the young birds which 1 sent him. 

 Professor Cooke agreed with my oonolusion that there was nothing 

 to justify the further retention of Ps its m. Uoydi in the list 



of Arizona birds. He remarked further that there seemed to be no 

 waj of disting uishing with certainty between the young of .". 

 ami those examples of your.- v w hich possess the black head 



markings. 



Following are brief descriptions of individuals of the l.ead- 

 oolored Hush-tit [Psatiriparw plumbeus) in juvenal plumage. As 





