A.O. Ziegler 1960 MYOTIS LUCIFUGUS Dungewers Hatchery, 500' ft. 4 mi. SSW Sequim, Chuckan Valley. June 23 Andy collected 100 or so bats from attic of the main building here clustered around a chimney in a very hot part of the structure. There were various sizes young also - from about new-born to flying-size. There were two species represented according to Dr. Benson who collected here before, M. lucifugus & M. yumanensis. He told the study skins apart as follows: LUCIFUGUS skull sloping gradually down eyes fur tips of hair brassy ears + membrane lighter YUMANENSIS ... sloping sharply ... not brassy ... darker We could make no distinction in the field on the coloration or presence or size of young with the species. Dr. Benson kept the 2 species in separate & when heated up again there was a difference in time it took the two forms to recover enough to fly or move again - but I don't remember which recovered first. Of 13 live specimens picked at random for skinning by myself, 3 were yumanensis.