FLIES F O R J U X K. 98 



in season until the end of June, or for a few days 

 in July. 



IMITATION. 



BODY. Dark mulberry floss silk, ribbed with 

 gold twist. 



TAIL. Three rabbit's whiskers. 



WINGS. From a brown mottled feather of the 

 mallard, which hangs from the back 

 over a part of the wing. 



LEGS. A purple dyed hackle, appearing black 

 when looked down upon, but a dark 

 tortoise-shell hue, when held between 

 the eye and the light. (See Dyes, 

 Chap. II. p. 35, article 5.) 



their former length, those of the female receive an accession of not quite 

 one third. The colour is generally altered, the wings become shining 

 and transparent. The male carries two large stemmata upon his head, 

 and a pair of callipers at the end of his body, which two peculiarities 

 chiefly distinguish his appearance from the female. He is also usu?lly 

 rather smaller than she is. He may be seen merrily dancing, as it 

 were, up and down in the air in vast crowds, frequently near a bush by 

 the water side, whilst the female is to be discovered busily employed 

 rising and falling and hovering over the water, and sometimes touching 

 the surface and making use of her long tails to spring up again. She 

 lays her eggs at this moment. 



The Larva and Nympha of the Genus Baetis have three tails, although 

 the fly which comes immediately out of the Nympha has only two. 



