During the fall and winter of 1938 the author conducted a brief study of the food habits of trout in Rattlesnake Creek, Missoula County, Montana. In the course of this investigation numerous bottom samples were taken, the final analysis of which yielded interesting but incomplete information concerning the distribution of several species of mayfly nymphs over part of the stream.
LINDUSKA, Age Indicators in the Ring-necked Pheasant 't27 1943 .• different years. Consequently, age determination, using spur lengtl{ alone, should be done with some circumspection and doubtful specimens checked by reference to other characters. Additional spur con-Vol. 60] LaNOUSrO,, •lge Indicators in the Ring.necked Pheasant 437 •945 a ditions which were found to be distinctive for each age group, and which should be considered, are the shape, color, and texture. It is our experience in Michigan that, as late as January, age recognition is possible for fully three-fourths of the cock birds by noting spur characters alone. The presumed ages of doubtful specimens may be easily verified by reference to the bursa, which can be probed through its opening into the cloaca. Aging of all hens was found possible into January, the juveniles being characterized by a bursa depth greater than 5 min. BOYDEN, •DWARD A. 1922. The development of the cloaca in birds, with special reference to the origin of the bursa of Fabricius, and the function of the urodael sinus, and the regular occurrence of a cloacal fenestra. Am. Jour. Anat., 30: 153-193. OowE•t, W. CARL 1939. The use of the bursa of Fabricius as an indication of age in game birds. Trans. Fourth N. Amer. Wilcll. Conf.: 426-430. JOLLY, T. 1915. La bourse de Fabricius et les organes lymphaepitheliaux. Arch. d'anat.
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