290 University of California Publications in Zoology [Vol. 10 



271-4-2717), Tahquitz Valley, two (nos. 2786, 2787), Vaudeven- 

 ter Flat, two (nos. 2304, 2305), Garnet Queen Mine, one (no. 

 2445), Dos Palmos, one (no. 2542). 



Lanivireo solitarius cassini (Xantus) 

 ( 'assin Vireo 



Found in fair abundance in such portions of the Tran- 

 sition zone as were visited by our parties. Many were seen at 

 Garnet Queen Mine the last week in June, and in Strawberry 

 Valley, during July; immature birds appeared in numbers in 

 Tahquitz Valley the latter half of July. Other points of record 

 were Keen's Camp and Schain's Ranch during June. A small 

 Juvenal, but recently from the nest, was taken at Garnet Queen 

 Mine, June 26. 



Seventeen specimens were collected: Schain's Ranch, two 

 (nos. 1809, 1810), Strawberry Valley, four (nos. 2718-2721). 

 Tahquitz Valley, six | nos. 2780-2785 i, and Garnet Queen Mine, 

 five i nos. 2446-2450). 



Vireo huttoni huttoni Cassin 

 Ilutton Vireo 

 Encountered at just one point in the region explored, at 

 Garnel Queen Mine, Santa Rosa .Mountains, altitude 6000 feet. 

 Here, in high Upper Sonoran. the species was fairly abundant. 

 Five specimens were taken (nos. 2401-2405), three adults in 

 worn plumage and two full-grown juvenals. 



Vireo belli pusillus Cones 

 Least Vireo 

 An abundant species in suitable portions of the Lower Son- 

 oran zone along the streams in the lower parts of the canons. 

 where there was sufficient vegetation for shelter. In lower Palm 

 Canon, the middle of June, they were particularly numerous, from 

 its mouth up to Little Paradise Valley, altitude about 3000 feet. 

 At the mouths of Palm and Murray canons the least vireos fre- 

 quented the dense thickets of mesquite and arrowweed. In Little 

 Paradise Valley and at one or two other points in the canon, 



