188 
Psyche 
Materials and Methods 
[Vol. 93 
Extensive collections in the Department of Entomolgy, Royal 
Ontario Museum (ROM) provided the main basis for this study and 
were supplemented by material borrowed from other collections; 
deposition of all other specimens examined is given below. On the 
distribution map for O. unicolor (Fig. 14), not all records in the 
central part of the range are plotted. Since complete listing of all 
records for O. unicolor is too voluminous for inclusion here, an 
abbreviated citation is used; localities are listed under state or pro- 
vince and any other identifier, followed by the place of deposition of 
the material, and the range for adult flight records is given for each 
state or province. A complete listing of all records compiled is dep- 
osited in the Library of the Royal Ontario Museum. Records for 
larvae are included; instars are designated as LV (Larval instar V), 
LIV, LIII, P (Pupa), PP (Prepupa). Life history data for O. unicolor 
are grouped into weekly intervals for plotting (Fig. 10), with each 
dot representing a collection comprising one or more individuals at 
a given stage. Larvae were identified to the third instar, although 
some characters are not as well developed as in the final instar. 
Observations on food are based on analysis of the contents of the 
entire gut from 10 LV, following the method of Cummins (1973). 
Food data were recorded on a percentage area basis using an eye- 
piece grid, and were classified under four categories: animal frag- 
ments, vascular plant pieces and filamentous algae, diatoms, and 
fine particulate organic material (FPOM) unidentifiable as to 
origin. 
Location of specimens examined 
CAS California Academy of Sciences, San Francisco 
CNC Canadian National Collection, Biosystematics Research 
Institute, Agriculture Canada, Ottawa 
DGD D. G. Denning, Moraga, California 
DJB D. J. Burdick, Department of Biology, California State Uni- 
versity, Fresno 
INHS Illinois Natural History Survey, Champaign 
LACM Los Angeles County Museum 
MCZ Museum of Comparative Zoology, Harvard University, 
Cambridge 
