. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 268 CLARENCE P. CUSTER AND CHARLES H. HICKS. Dianthidium sayi Cockerell syn. interruptum Say. (nom. preocc.). The bees of the genus Dianthidium have been known to construct nests of resin on rocks, in stems of plants, in deserted snail shells and other places, but, so far as we know, seldom in the ground as does Dianthidium sayi. We have found no reference to the nesting habits of this species except that in 1926 by Hicks (5). This latter information was derived from a number of cells dug up from a small area at White Rocks,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 268 CLARENCE P. CUSTER AND CHARLES H. HICKS. Dianthidium sayi Cockerell syn. interruptum Say. (nom. preocc.). The bees of the genus Dianthidium have been known to construct nests of resin on rocks, in stems of plants, in deserted snail shells and other places, but, so far as we know, seldom in the ground as does Dianthidium sayi. We have found no reference to the nesting habits of this species except that in 1926 by Hicks (5). This latter information was derived from a number of cells dug up from a small area at White Rocks, during fall of 1925 near Boulder, Colorado. We have obtained our field notes during the summer of 1926 mainly at this locality where two colonies, one hundred yards apart, were found and The six colonies of D. sayi, observed during the latter part of the summers of 1925 and 1926, were all located on hillsides that face south and slightly east. Scattered over these hillsides were tufts of Bromus brizxformis Fisch. and Mey.,1 to the roots of which some of the resin cells were attached. We find that the species may nest as a colony of from eight to fifty or more females, although one apparently solitary female was found nesting in a vertical clay bank. The colony is at its maximum activity during the month of September. The picture shows a small colony of D. sayi on a grass-covered mound of sandy soil one yard in diameter. Base rock surrounds this on all sides, the nearest soil being five feet away. Tall 1 Kindly determined by Dr. Francis Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred
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