44 Pasadena Academy of Sciences. Publication tl 



2 ('95). Breeds numerously in the mountain canons from the foot- 

 hills to 4000 feet elevation, nesting mostly in cottonwoods and white 

 oaks in May. Extreme nesting dates from my field notes: A set five, 

 incubation nealy complete, May 11 ('95); and a set of three, slightly 

 incubated, June 26 ('93); both taken in the Arroyo Seco Canon north 

 of Pasadena. 

 251 — 632. Vireo hutioni Cass. 



Hutton's Vireo. 



A common bird throughout the year; although it occurs froni the 

 willow regions in the lowlands up to 6000 feet in the mountains, de- 

 cided preference seems to be shown for the oak regions of the mesas 

 and foothills. The breeding season is quite extensive, as shown by 

 the following extremes: A set of three fresh eggs, taken by me in the 

 foothills north of Pasadena, March 7 ('96) ; and a set of four fresh eggs, 

 taken by H. A. Gaylord near Pasadena, July 15 ('94). However, the 

 majority of sets are laid in April and May. Full sets are of three or 

 four. 



252 — 6jja. Vireo bellii pusillus (Coues). 



Least Vireo. 



Abundant in summer in the willow regions of the lowlands, and 

 along streams up to the foothills. Arrives by the first week in April 

 and leaves during the last week of August. My earliest and latest 

 dates are, respectively, March 26 ('96) and Sept. 8 ('97). Breeds 

 mainly during the latter part of May. Extremes: Sets of four fresh 

 eggs, both taken near I^os Angeles by H. Robertson, earliest, April 28 

 ('97) and latest, June 15 ('97). Full sets are almost invariably of four 

 eggs. 

 253 — 6j6. Mniotilta varia (I,inn.). 



Black and White Warbler. 



Only one record: An immature female was taken in the Arroyo 

 Seco near Pasadena by H. A. Gaylord, Oct. 2, '95. 



254 — 6^^a. Helminthophila rubricapilla gutturalis Ridgw. 

 Calaveras Warbler. 



Common spring and fall migrant. Noted in the spring mostly in 

 the foothill and mesa regions. Earliest specimen, taken by me, April 

 4 ('96); latest, by H. A. Gaylord, May i ('96). In the fall this 

 warbler appears mainly in the lowlands. In the vicinity of I<os An- 

 geles H. S. Swarth has noted it from Sept. 13 ('97) to Oct. 8 ('96). 

 255 — 64.6a. Helminthophila celata lutescens (Ridgw.). 

 Lutescent Warbler. 



Tolerably common in summer in canons and on brushy mountain 

 sides up to 6000 feet. Abundant spring migrant, appearing in greatest 

 numbers in April. Earliest specimen of this race, taken by me, March 

 6 ('97); last taken in the fall, Sept. 8 ('97). Breeds in April and May. 

 I took a female on April 4 (96) which contained a fully formed egg. 

 Juveniles were secured early in July ('95) on Pine Flats (6000 feet). 

 256 — 646b. Helminthophila celata sordida Townsend. 



Dusky Warbler. 



This subspecies appears in the vicinity of Pasadena in the oak re- 



