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40 Riotte: Eastward extension of Euchloe subspecies Vol. 22, no. 1
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NOTES ON EUCHLOE AUSONIDES MAYI (PIERIDAE) IN ONTARIO
J. C. E. Riotte1
Royal Ontario Museum, University of Toronto, Ontario, Canada
Syme (1961) reported about the occurrence of Euchloe ausonides mayi Chermock & Chermock in Ontario. From his report it can be seen that this species was first taken in Ontario in Malachi (Kenora District, near the Manitoba border) on July 5, 1947, by a summer field party of the Royal Ontario Museum. In 1956 Paim collected the same species on June 1, at Rasswood Lake (Quetico Provincial Park, Rainy River District, near the Minnesota border).
To our knowledge of the distribution of Euchloe ausonides mayi in Ontario can be added the captures by Syme and Wood along the roadside of Highway 11, 3 to 15 miles east of Reardmore (Thunder Ray
1 Paper read at the 103rd Annual Meeting of the Ent. Soc. of Ontario, Nov. 3, 1966, in Toronto, Ont.
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1968
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Journal of the Lepidopterists' Society
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41
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District) on June 1, 1958; Allin in Sibley Provincial Park (Thunder Bay District) on May 27, 1961; and Hartley in S. Neebing township (Thunder Bay District) on June 11, 1962.
On June 12, 1966, a summer field party of the Royal Ontario Museum worked in Geraldton (Thunder Bay District) and was surprised to find Euchloe ausonides mayi in the Geraldton forest on Charles Road. This was the signal to check thoroughly on the Syme localities along Highway 11 between Geraldton and Beardmore. As expected, also along Highway 11 the species had considerably extended its range to the east so that the first ausonides were already found 8% miles east of Jellicoe, i.e. ISY2 miles more to the east than in 1958, and from there on many localities along Highway 11 to the west, to shortly before Beardmore where Syme and Wood reported the western limit of the species. The continuation of the distribution between there and Fort William (where Allin took the species again in 1966 at about the same time) and the locality "8% miles E of Jellicoe" and Geraldton has yet to be established.
The distribution of the species is clearly connected with the distribution of Arabis drummondi, a northern species of Arabis. Wherever this plant was found, the butterfly also was found. On June 17, a female was observed hovering over a patch of this plant at the locality "15 miles E of Beardmore." Some eggs were preserved and on June 24, numerous larvae of E. ausonides mayi were found on those plants. One caterpillar in the last instar was photographed and with two smaller ones was taken for rearing on June 27. The larger caterpillar was kept on Geraldton Arabis and pupated on July 1; the two smaller ones had to be changed over to other species of Arabis, e.g. Arabis divaricarpa, and eventually died.
This left the question, were these caterpillars also on the Arabis in the Geraldton forest on Charles Road? On June 28, the day of our departure a colony of second instar larvae was found on those plants.
A considerable easterly range extension of Euchloe ausonides mayi is established herewith. The present writer lived in Geraldton and collected there regularly every year up to 1958 but no E. ausonides had been captured up to that time.
Literature Cited
Allin, A. E., 1961. The Canadian Lakehead. The Flicker 53: 119-122.
Syme, P. D., 1959. The occurrence of Euchloe ausonides mayi in Ontario. The
Ont. Field Biol. 13: 33. 1961. The occurrence of two Euchloe species in Ontario (Pieridae). Journ. Lep.
Soc. 15: 113-114.
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