CONTENTS. 



Page. 



Introduction 5 



Generic and specific synonymy of Prociphilus tessellata Fitch 6 



First series: Pemphigus aceri/olii Riley 9 



Extracts from notes made at the time 11 



Second series : Pemphigus tessellata Fitch 14 



Extracts from notes made at the time 14 



Description of the principal stages of Prociphilus tessellata Fitch 18 



Sexual generation 19 



Sexual female 19 



Male 20 



Winter egg 21 



Asexual generations 21 



Colony on leaf of maple 21 



Young stem-mother 21 



Mature stem-mother 22 



Migrant 22 



Apterous female on alder 23 



Hibernating series 24 



Economic status 25 



Index 27 



ILLUSTRATIONS. 



Page. 



Fig. 1. Prociphilus tessellata: Migrants from maple to alder 12 



2. Prociphilus tessellata: Return migrants on trunk of maple 16 



3. Prociphilus tessellata: Sexual female and antenna 19 



4. Prociphilus tessellata: Male and antenna 19 



5. Prociphilus tessellata: Colony on leaf of maple 20 



6. Prociphilus tessellata: Young stem-mother and antenna 21 



7. Prociphilus tessellata: Mature stem-mother and antenna 22 



8. Prociphilus tessellata: Migrant and antenna 23 



9. Prociphilus tessellata: Colonies of apterous feaiales on alder . 24 



10. Prociphilus tessellata: Colonies of apterous females on alder 24 



11. Gallery made by the ant Cremastogaster to protect colony of Prociphilus 



tessellata on alder 25 



12. Prociphilus tessellata: Apterous female and antenna 25 



3 



