160 
Psyche 
[Vol. 94 
Materials and Methods 
Lending museums and individuals are referred to by the following 
abbreviations: 
AMNH American Museum of Natural History, New York, New 
York. 
LACM Los Angeles County Museum of Natural History, Los 
Angeles, California. 
MDPC Mark B. DuBois, Washington, Illinois. 
ORST Oregon State University, Corvallis, Oregon. 
UKS University of Kansas, Lawrence, Kansas. 
SSPC Steven O. Shattuck, University of California, Davis, 
California. 
UALB University of Alberta, Edmonton, Alberta, Canada. 
UCB University of California, Berkeley, California. 
UCD University of California, Davis, California. 
UCOL University of Colorado Museum, Boulder, Colorado. 
UIDM University of Idaho, Moscow, Idaho. 
UNSM University of Nebraska State Museum, Lincoln, 
Nebraska. 
USNM United States National Museum, Washington, D.C. 
UTST Utah State University, Logan, Utah. 
UWYL University of Wyoming, Laramie, Wyoming. 
WAST Washington State University, Pullman, Washington. 
Analysis of Specimens 
Every attempt was made to record character data on worker spec- 
imens from the entire range of each species and to represent all areas 
with roughly equal numbers of individuals. In some cases this meant 
ignoring specimens from densely collected areas, when other areas 
lacked sufficient samples for analysis. If a single nest was repre- 
sented by many individuals, three individuals were selected at ran- 
dom and their characteristics recorded. Queens and males were not 
analyzed because they are poorly represented in collections. Speci- 
mens were examined with a dissecting microscope at 75X magnifica- 
tion. Measurements were made with an ocular micrometer and 
recorded to the nearest 0.01 mm. The collection sites for specimens 
studied are listed in Shattuck (1985). 
