. The Canadian field-naturalist. 72 The Canadian Fiei,d-Naturai,ist (Vol. LI 'Sy-. ^o^. W m Fig. 3. Epidemics among snowshoe rabbits. Dotted areas arc groups of squares overlapped by observers reporting EPIDEMICS in 1935-36. Larger dots are Hudson's Bay Company posts, etc. (1927 map.) Broken lines show main vegetation zones. Thick black lines arc Province boundaries. last summer (1935) and that practically no rabbits can be found there now. From Dawson South to the confluence of the Tanana with the Yukon, the peak seems to be at its highest point this season (1936). From there to the mouth of
. The Canadian field-naturalist. 72 The Canadian Fiei,d-Naturai,ist (Vol. LI 'Sy-. ^o^. W m Fig. 3. Epidemics among snowshoe rabbits. Dotted areas arc groups of squares overlapped by observers reporting EPIDEMICS in 1935-36. Larger dots are Hudson's Bay Company posts, etc. (1927 map.) Broken lines show main vegetation zones. Thick black lines arc Province boundaries. last summer (1935) and that practically no rabbits can be found there now. From Dawson South to the confluence of the Tanana with the Yukon, the peak seems to be at its highest point this season (1936). From there to the mouth of the Yukon, our reports indicate that the cycle of highest abundance will not be reached until next ; In the absence of details for 1935-36, the areas were mapped as circle of SO mile radius round the same points as in Mr. Dufresne's report for 1934-35. Mr. Otto W. Geist, University of Alaska, reports (11 January, 1937) that "rabbits in this section (25 miles radius round Fairbanks) are more numerous now than I ever observed before. I have heard that in the region about Flit, Iditarod, one man who is a good observer, kiJed only one this ; He also confirms the increase during 1935-36. Mr. Charles H. Rouse, Biological Survey, reports (22 October, 1936) also for the Fair- banks area (mostly three miles west of the settlement) "More abundant. There was no sudden decrease . . during the last 12 months. A number of rabbits were killed during the fall, winter and spring of 1935-36. Several were found to be heavily infested with tape- worms, which were tentatively identified as Cittotaenia ctcnoides. It was also reported to me that many rabbits were found dead during January and February, 1936, under haycocks which had been left in the fields at the Univer- sity Farm and the Dana Ranch. It was thought these animals froze to death . ." Mr. Geist. Please note that these images are extracted from scanned page images that may have been digitally e
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