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 Nov., 19oo I THE CONDOR I37 ]mpidonax trailli. TRAILL FLYCATCHER. Common in the Transition Zone. Pica nuttalli. YELLOW BILLED MAGPIE. Although this is really a valley bird, it is a species commonly found in the foothill regions, and probably comes up on the lower slopes of the mountain spor- adically. Cyanocitta stelleri frontalis. BLUE-FRONTED JAY. This is one of the commonest birds on the mountain. It is confined fairly well to the Transition Zone, from which it sometimes makes short sallies down the mountain. This jay is very destructive to corn. I observed a small field which had been ruined by this and the following species. I have compared a specimen from Mt. St. Helena with fairly typicalfronla/is, and with the darker form, car- bonacea, from the Santa Cruz mountains. I find the St. Helena bird is referable to./?onla/is. This is interesting as showing a tendency toward paleness, though but a short distance from the dark coast forms. Aphelocoma californiea. CALIFORNIA lAY. Very abundant. This species is chaacteristm of the Upper Sonoran Zone, whence it ranges into Transition, for some distance. Sturnella magna negleeta. WESTERN MEADOWLARK. Lower slopes of mountains and Napa Valley. Ieterus bulloeki. BULLOCK ORIOLE. I saw an old nest, (alt. 2300 ft.), but the birds had left the mountaiu. Seoleeophagus eyanoeephalus. BREWER BLACKBIRD. This species ranges up on the mountain sporadically. I saw a few, evi- dently on their way over to Lake County, at 2500 feet, Transition. Carpodacus mexicanus obscurus. LINNET. Found around vineyards and ranches in the Upper Sonoran, also in Napa Valley (dilute Lower Sonoran). Astragalinus psaltria. ARKANSAS GOLDraNCH. I observed a few on the upper border of timber, flying about in the tall chaparral. Pipilo maculatus megalonyx. StYRRED TowIIr::. Abundant. Pipilo fuseus crissalis. CALr'ORNIA TOWSEE. Common. Zamelodia melanoeephala mierorhyneha Grinnell. BLACK-HEADED GROSBEAK. Fairly common in maple and black oak woods. Piranga ludoviciana. LOUISIANA TANAGER. This species was very abundant in Transition woods. I saw no adult males. Petrochelidon lunifrons. CLi  SWAI, LOW. A few observed. Tachycineta thalassina. VIOLET-GREEN SWALLOW. A small flock was observed circling about a large rock on the upper slopes of the mountain. A specimen collected has the first traces of adult feathers on the back. The majority of the flock were apparently immature. Vireo gilvus swainsoni. WESTERN WARBLING VIREO. I observed one at close quarters, in a scrub oak, on the north slope of the mountain, alt. I6OO ft. Vireo huttoni. HUTTON VIREO. Very common; all that I observed were in the Transition Zone. Dendroica nigrescens. BLACK-THROATED GRAY WARBLER. This beautiful warbler was exceedingly common in the Transition Zone. Its favorite haunt was rather open oak trees. I observed as many as a dozen in a single tree and this was no great exception. Dendroica townsendi. TOWNSEXD Wt[RBLER. I secured two in the Transition Zone. These were evidently migrants.