IN THIS ISSUE
Date of Publication: May 1975
| The genetics of subspecific phenotype differences in Pieris occidentalis Reakirt and of variation in P. o. nelsoni W.H. Edwards (Pieridae) | Arthur M. Shapiro | |
| Early stages of Phyciodes pallida, P. orseis , and P. mylitta (Nymphalidae) | James Scott | |
| Recent captures of Anthocharis cethura catalina Meadows | Larry J. Orsak | |
| Old Timers | John Adams Comstock | |
| Why do California Tortoiseshells migrate? | Arthur M. Shapiro | |
| Early work on the Megathymidae | John Adams Comstock | |
| Supplementary records of butterflies in the Sacramento Valley and Suisun Marsh, lowland central California | Arthur M. Shapiro | |
| An ecological study of the butterflies of the Sierra de Tuxtla in Veracruz, Mexico | Gary N. Ross |
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