1976] 
Peck — Beetle Genus Echinocoleus 
61 
I hope that this hypothetical series can be further tested with addi- 
tional information on yet unknown species, and on additional dis- 
tributional and host data for the known species. 
Acknowledgements 
J. F. Lawrence, H. F. Howden, and W. L. Brown, Jr., reviewed 
all or parts of the manuscript. F. Werner (University of Arizona, 
Tucson), A. Newton (MCZ), D. E. Foster (Texas Tech), D. Kava- 
naugh (CAS), and J. M. Kingsolver (USNM) loaned or contributed 
specimens from their collections or collections under their care. 
My field work in the southwestern US was supported by a Canadian 
National Research Council operating grant. Drs. Brown, Foster, 
and Werner contributed information from their studies of the host 
ants. 
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