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Clench: Migration of Libytheana and Kricogonia Vol. 19, no. 4
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numbers. No evidence of migratory activity was seen. Libytheana were particularly prevalent on a low, white-flowered, heathlike plant growing in large clumps in open areas and could be seen there by the dozen.
Taking into account the direction of our route and the observed direction of the flight one may conclude that the migratory flight was in a band about 60 miles wide. Assuming an average density of 10 individuals per minute per 100 feet of front, the total rate of passage comes to about 190,000 per hour or 1.7 million per nine-hour day.
Curiously, several days later and about a hundred miles to the east— specifically on July 10 at the junction of U. S. highway 281 and Texas highway 141 (about 14 miles west of Kingsville, in Jim Wells County) — we again encountered a heavy migration of Libytheana (only), this time heading about due south. Our route took us north on 281 and we quickly left the migrants behind, but during the short time we were among them the car radiator became completely clogged.
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INTERNATIONAL COMMISSION ON ZOOLOGICAL NOMENCLATURE
Notice of proposed use of plenary powers in certain cases (A. (n.s.) 70)
In accordance with a decision of the 13th International Congress of Zoology, 1948, public notice is hereby given of the possible use by the International Commission on Zoological Nomenclature of its plenary powers in connection with the following case, full details of which will be found in Bulletin of Zoological Nomenclature, Vol. 22, Part 3, published on 13 August 1965.
(2) Designation of a type-species for Anthanassa Scudder, 1875 (Insecta, Lepidoptera) Z.N.(S.) 1697;
Any zoologist who wishes to comment on the above case should do so in writing, and in duplicate, as soon as possible, and in any case before 13 February 1966. Each comment should bear the reference number of the case in question. Comments received early enough will be published in the Bulletin of Zoological Nomenclature. Those received too late for publication will, if received before 13 February 1966, be brought to the attention of the Commission at the time of commencement of voting.
All communication on the above subject should be addressed as follows: The Secretary, International Commission on Zoological Nomenclature, c/o British Museum (Natural History), Cromwell Road, London, S.W.7, England. w E CmNA
Assistant Secretary to the International Commission on Zoological Nomenclature
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