MEMOIRS OF THE :S’ATIONAL ACADEMY OF SCIENCES. 
49 
Subfamily HI.— Pyg^erin-^. 
Datana californica (2). 
Subfamily IV. — Ichthyurin^. 
Icbtbyura apicalis (1,2). Iciitliyura briicei (1). 
var. oriiata (1, 2). var. multnoma (1). 
var. astorife (1). albosigma (1), 
var. bifiria (2). 
iuornata (2). 
Subfamily Y. — NoTODONTiNiE. 
Nadata gibbosa (1, 2). Notodoiita stragula var, pacifica (2). 
Pheosia dimidiata (1, 2). 
Subfamily VI. — HETEROOAHPiNiE. 
Schizura iimmepe (1, 2), Scbizura coiiciuna (salicis) (2). 
perangulata (1). Heterocampa plumosa (1, 2). 
unicornis (2). 
Subfamily Yll. — C erurin^e. 
Cerura scolopendrina (1, 2). Cerura cinerea (1, 2). 
Tins list shows in a very striking Avay that not only is there not a genus of Notodontiuje as far 
as we yet know peculiar to the vast Campestriau subproviuce, but also, with perhaps the exception 
of one species [Reicrocampa plimosa)^ there is not throughout the whole of western North America 
any of the family widely distinct from eastern forms. All of the species and varieties of Ghiphma 
appear to be but climatic varieties of the eastern G. sepfentrionis and severa; the single species 
of Datana {B. cnUfornica) may prove to be a local variety of i>. 7Hinistm. The only distinct 
species of Ichthyura is 7. hiornafaj whose specific rank is quite doubtful, since I have been 
inclined to regard it as only a climatic variety of I, apicalis, Scliizm-a perangulata is, however, 
quite distinct, and yet it is closely allied to S, eximia, 
111 fact, the greater part of the number of Campestriau species are really inhabitants of the 
humid, wooded mountains and elevated valleys which rise out of the dry, rainless plains and 
plateaus, and the siiecies found there are truly members of the Appalachian fauna, the areas 
which they inhabit being simple outliers on the western and Pacific slopes of the Appalachian 
subprovince (Canadian and Alleghaiiian fauna), which extends southward along the elevated 
ranges of the Rocky Mountains of the Cascade Range and the Sierra Nevada. 
The Notodontians are peculiarly tree-inhabiting forms, and in a region so destitute of forests 
and of deciduous trees as the Plains, the Great Basin, and California we should not expect good 
material for characterizing faunm. Hence the distribution of this restricted group of moths 
presents very different results from that of insects in general and of mammals and birds, and it is 
difficult to separate on such slender evidence the Californian or Pacific Coast district fauna from 
the Campestrian, though when we take into account other groups of.insects, especially Coleoptera, 
we seem warranted in such a ditferentiation of the faunm of western North America. 
From what we know of the life histories of the Californian and Campestrian Notodontians 
their principle food plants in that region are the poplars and willows which tlourish along the 
river courses of that dry area, others feeding on the scrub oaks of the plains and foothills. 
This interdigitation of Campestrian (dry) and humid forest-clad mountain tracts, with the 
outliers from the Boreal (Arctic, Hudsonian, and Canadian) and Allegliauiau (“Transition” 
Merriam) faunse is well shown on Dr, Merriam’s map.* 
* 111 our zoogeograi)liical map published in 1883 (Vol. XII, Hayden’s Annual Report) we believe we were the first 
to represent on a colored map the southward extension along the Rocky Monntain range and Sierra Nevada, as 
well as along tlie AiJiialachians and Adirondacks of the Boreal (Canadian) province. Having visited those moun- 
tains and studied the Alpine fauna of those regions, and from general knowledge, it is somewhat surprising to read 
on page 226 of Pr. Allen’s article the following statement: 
Dr. Packard, in his otherwise excellent zoogeographical map of North America, failed, however, to recognize 
the southward extension of the Cold Temperate subregion along the principal inoiintaiu systems of the continent,” 
On the contrary, as anyone will see on examining my map, I have carried down along the Rocky Mountain range a 
long loop of the isotherm of 40*^ as nearly far south as Santa Fd, N. Mox., and colored the mountain ranges and 
spurs within the loop pale blue, the same bue as that used in coloring the Boreal province. 
S. Mis. 50 1 
