GEORGIAN BAY EPHEMERID^ 143 



SESSIONAL PAPER No. 39b 



1911. Morgan, Anna H. — Mayflies of Fall Creek. Annals of the Entomological Society of America, 

 vol. IV., No. 2, 1911. 



1913. Clemens, W. A. — New Species and New Life Histories of Ephemeridse or Mayflies. 

 Can. Entomologist, vol, XLV., Nos. 8 and 10. 



EXPLANATION OF PLATES. 



PLATE XV. 



HEPTAGENIA NYMPHS. 



Fig. 1. Heptagenia tripunctata Banks. 

 Fig. 2. Heptagenia lutea Clemens. 

 Fig. 3. Heptagenia luridipennis Burm. 

 Fig. 4. Heptagenia fiavescens Walsh. 

 Fig. 5. Heptagenia fiavescens, ventral view. 



PLATE XVI. 



HEPTAGENIA NYMPHS. 



Fig. 1. Heptagenia fusca, Clemens. 

 Fig. 2. Heptagenia rubromaculata Clemens. 

 Fig. 3. Heptagenia frontalis Banks. 

 Fig. 4. Heptagenia canadensis Walker. 

 Fig. 5. Heptagenia, undetermined. 



PLATE XVII. 



MOUTH-PARTS AND GILL OF NYMPH OF H. LUTEA CLEMENS, AND GENITALIA 



OF H. TRIPUNCTATA BANKS. 



Fig. 1. Left maxilla. 

 Fig. 2. Labium. 

 Fig. 3. Labrum. 

 Fig. 4. Hypopharynx. 

 Fig. 5. Left mandible. 

 Fig. 6. Gill. 

 Fig. 7. Genitalia. 



PLATE XVIII. 



MOUTH PARTS AND GILL OF NYMPH OF H. CANADENSIS WALKER, AND GENI- 

 TALIA OF IMAGO. 



Fig. 1. Left maxilla. , 



Fig. 2. Hypopharynx. 



Fig. 3. Labrum. 



Fig. 4. Labium. 



Fig. 5. Left mandible. 



Fig. 6. Gill. 



Fig. 7. Genitalia. 



