Transcriber's Note Text emphasis for italics is represented by _Text_. * * * * * U. S. DEPARTMENT OF AGRICULTURE, BUREAU OF ENTOMOLOGY--BULLETIN No. 121. L. O. HOWARD. Entomologist and Chief of Bureau. THE BEHAVIOR OF THE HONEY BEE IN POLLEN COLLECTING. BY D. B. CASTEEL, Ph. D., _Collaborator and Adjunct Professor of Zoology,_ _University of Texas._ Issued December 31, 1912. [Illustration] WASHINGTON: GOVERNMENT PRINTING OFFICE. 1912. _BUREAU OF ENTOMOLOGY._ L. O. Howard, _Entomologist and Chief of Bureau_. C. L. Marlatt, _Entomologist and Acting Chief in Absence of Chief_. R. S. Clifton, _Executive Assistant_. W. F. Tastet, _Chief Clerk_. F. H. Chittenden, _in charge of truck crop and stored product insect investigations_. A. D. Hopkins, _in charge of forest insect investigations_. W. D. Hunter, _in charge of southern field crop insect investigations_. F. M. Webster, _in charge of cereal and forage insect investigations_. A. L. Quaintance, _in charge of deciduous fruit insect investigations_. E. F. Phillips, _in charge of bee culture_. D. M. Rogers, _in charge of preventing spread of moths, field work_. Rolla P. Currie, _in charge of editorial work_. Mabel Colcord, _in charge of library_. Investigations in Bee Culture. E. F. Phillips, _in charge_. G. F. White, J. A. Nelson, _experts_. G. S. Demuth, A. H. McCray, N. E. McIndoo, _apicultural assistants_. Pearle H. Garrison, preparator. D. B. Casteel, collaborator. LETTER OF TRANSMITTAL. U. S. Department of Agriculture, Bureau of Entomology, _Washington, D. C, September 23, 1912_. Sir: I have the honor to transmit herewith a manuscript entitled "The Behavior of the Honey Bee in Pollen Collecting," by Dr. Dana B. Casteel, of this bureau. The value of the honey bee in cross pollinating the flowers of fruit trees makes it desirable that exact information be available concerning the actions of the bee when gathering and manipulating the pollen. The results recorded in this manuscript are also of value as studies in the behavior of the bee and will prove interesting and valuable to the bee keeper. The work here recorded was done by Dr. Casteel during the summers of 1911 and 1912 at the apiary of this bureau. I recommend that this manuscript be published as Bulletin No. 121 of the Bureau of Entomology. Respectfully, L. O. Howard, _Entomologist and Chief of Bureau_. Hon. James Wilson, _Secretary of Agriculture_. CONTENTS. Page. Introduction 7 The structures concerned in the manipulation of pollen 7 The pollen supply 10 General statement of the pollen-collecting process 11 Action of the forelegs and mouthparts 13