Western evening grosbeaks collected during the spring migrations of 1947 and 1948 in Corvallis, Oregon, were found to be heavily infected with a trematode inhabiting the bile passages of the liver. Nine birds were examined, 6 of which were infected with 4 to 42 parasites per bird. Serial longitudinal and cross sections as well as whole mounts were prepared for anatomical study. The drawings were made by placing whole mounts on a Bausch & Lomb triplepurpose projector. The images were reflected onto photographic paper which was then developed. The anatomical details were traced with India ink after the paper was dried. Then the silver deposit was removed with photographic bleach and the paper again dried. Further details were added free-hand following a study of the serial sections. The same technique was employed for figures 1 and 3 except that a compound microscope was used instead of the projector. The type specimen deposited in the U. S. National Museum has been catalogued as U. S. N. M. Helm. Coll. 37087. Nine paratypes have been catalogued as No. 37088 in the same collection. Additional paratypes have been deposited in the invertebrate collections, Department of Zoology, Oregon State College. In the description below the first measurement was that of the smallest of a structure in any of the 9 paratypes, next the largest of a structure of the 9 paratypes in the U. S. National Museum. The third measurement given in parenthesis was of the type form.
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Jan 1, 1957
W L Putman 
Open Access
