. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. ^BULLETIN OF THE Southern California Academy of Sciences LOS ANGELES, CALIFORNIA Vol. 69. Part 1 LIE APR :.' CONTENTS The Hylaeus of the Bonin Islands, Western Pacific Ocean (Hymen- optera: CoUetidae). Roy R. Snelling 1 Trace fossils of Trilobites from the Deadwood Formation (Upper Cambrian) of Western South Dakota. George Callison 20 Epicaridea (Isopoda) of Hawaii. Charles G. Danforth 27 A small collection of Chiggers from Surinam (Acarina: Trombicu- lidae). James M. Brennan 32 New Myrmecinae
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. ^BULLETIN OF THE Southern California Academy of Sciences LOS ANGELES, CALIFORNIA Vol. 69. Part 1 LIE APR :.' CONTENTS The Hylaeus of the Bonin Islands, Western Pacific Ocean (Hymen- optera: CoUetidae). Roy R. Snelling 1 Trace fossils of Trilobites from the Deadwood Formation (Upper Cambrian) of Western South Dakota. George Callison 20 Epicaridea (Isopoda) of Hawaii. Charles G. Danforth 27 A small collection of Chiggers from Surinam (Acarina: Trombicu- lidae). James M. Brennan 32 New Myrmecinae (Coleoptera: Curculionidae). Elbert L. Sleeper 38 Communication systems and organizational systems in three species of rodents. George F. Fisler 43 A new subgenus and two new species of Hexidionis (Acarina, Trom- biculidae) from North America. Richard B. Loomis and James L. Lucas 52 Sexual differences in foraging behavior of white-headed woodpeck- ers. Robert Koch, Armand E. Courchesne and Charles T. Col- lins 60 r March 31, 1970. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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