830 CHARLES Paut ALEXANDER 
The Canadian-Transition zone-— A great many species occur in both 
the Canadian and the Transition life zone, and these for the most part 
find their northern or southern limit in one or the other of these belts. 
The floral constituents of this border zone are numerous and varied, 
a large number of the Canadian forms finding their southern limit in 
the Transition zone, and, conversely, many of the more southern species 
extending their range into, and finding their northern limit in favorable 
situations in, the Canadian zone. The more notable plants that seem to 
fall within this category are: 
Maianthemum canadense Desf. Rubus hispidus L. 
Streptopus roseus Michx. Sanguisorba canadensis L. 
Medeola virginiana L. Nemopanthus mucronata (L.) Trel. 
Cypripedium arietinum R. Br. Acer pennsylvanicum L. 
hirsutum Mill. Hypericum canadense L. 
Habenaria lacera (Michx.) R. Br Trientalis americana (Pers.) Pursh 
Laportea canadensis (L.) Gaud. Gentiana linearis Froel. 
Arceuthobium pusillum Peck Diervilla Lonicera Mill. 
Asarum canadense L. Viburnum cassinoides L. 
Polygonum amphibium L. Lobelia Kalmii L. 
Caltha palustris L. Solidago latifolia L. 
Actaea alba (L.) Mill. rugosa Mill. 
Caulophyllum thalictroides (.) Michx. graminifolia (L.) Salisb. 
Corydalis sempervirens (L.) Pers. Aster umbellatus Mill. 
Pyrus arbutifolia (L.) L. f. Anaphalis margaritacea (L.) B. & H. 
melanocarpa (Michx.) Willd. Erechtites hieracifolia (L.) Raf. 
Potentilla palustris (L.) Scop. 
The majority of the crane-flies of the northeastern United States seem 
to belong here. There are many species which are strongly Canadian 
in their associations but still seem to range outside the Canadian zone. 
In the following list these species are designated by the letter C, in paren- 
thesis. It must be understood that many of these species are about as 
typically Canadian as those given in the preceding list, but slight extensions 
of their range make it appear more desirable to include them in this quali- 
fied list. 
The few species which are Transitional but range into the Canadian 
zone are here designated by the letter 7. 
Protoplasa fitchii O. S. Dicranomyia macateei Alex. (C) 
Trichocera subsinuata Alex. (C) monticola (Alex.) (C) 
Rhyphus alternatus Say morioides O. S. 
Dicranomyia gladiator O. S. (C) pubipennis O. S. (C) 
globithoraz O. S. (C) pudica O. S. 
haeretica O. S. Limnobia triocellata O. 8. 
immodesta O. 8. _ Rhipidia fidelis O. 8. 
