September, 19o2. I THE CONDOR 1 3

belt, many of which rise to a height of several thousand feet. The narrow open coast belt extends up the coast to the Columbia, with a few interruptions. Near Crescent City it assumes the forn of a Transition coastal plain several miles in width. Diagnostic plants of these Transition areas are: ofiulus trichocarfia Osmaronia cerasformis Pset/dotstga mucronala Q,ercus densiflora hododendron cahfornicum (also boreal) h,s diversiloba ibes malvacetm hamnus purshiana Scrophu[aria californica Faccinium Umbellularia calornica (river valleys In the mountains just to the east of the redwood belt, Pseudotsuga mucronala is the prevailing forest tree--a typical Transition species, as are also Uastanopsis chrj,sofikvlla, Quercus cal(fornica, Quercus densijqora, Qtercus chrysolefiis, and Arbu- l,s menziesi, which occurs here. Within about twenty-five miles of the coast in the latitude of Eureka, and fifteen in the latitude of Crescent City, the Humid Transition merges into the Arid Transition. The extensive lumberlug activities in the vicinity of Humboldt Bay have per- manently laid bare large tracts of country. The original Canadian nature of such tracts has been completely changed, and several species of transitiou plants, ori- ginally inconspicuous or wanting in the cold adverse conditions of the forest floor, have taken a new lease on life. have actually changed the zone. Austral birds. Such species are: Lop,%rlyx calfornicus Zenaidura macrozra Catharles aura ITuleo b. calurus ln'alco sarz,erius Uhordeiles virginianus Selasfihores allertl 7'yrannus verlicalis Sayornis n. semialta Empidouax d(fiqclis Corvus americanus Agelaius . californz?us (?) Slumella m. nelecta Scolecopha. fus cyanocefihalus These, with the intrusion of other Austral types The open country has been rapidly invaded by Carfiodacus m. frontalis Carpodac,s ]5. californicus Astrazalius t. salicamans Affelosfiiza c. cleonensis Sfiizella s. arizonm Pilo m. oregonus Zamelodia melanocefihala Cyano,75iza amcena Pelrochelidon lumfrons Tachycineta bicolor ]felmintholbhila c. lutescerts Dendroica aestiva Chamma f. phma Sialia m. occidentalis These species, originally restricted to the narrow river valleys and open coast belt have since acquired a much wider distribution in this region. Many species have undoubtedly greatly increased in numbers since the advent of settlers, and possibly a few are recent intrusions. The Canadian, in a weakened form is represented by a very restricted area,

which, year by year is becoming smaller, and may ultimately disappear altogether.