25 



black. The body is black with one pale yellow ring, 

 the head black, thorax black, and tail-tuft black; the 

 antenna?, which are also black, have a pale yellowish 

 rather broad bar on their upper side near the top. 



Localities for this species are Langwith near York, 

 Burton-on-Trent, Manchester, the New Forest (?), and 

 woods near London (?). 



The dates of the appearance of the perfect insect are 

 the end of May and the beginning of June, and on to 

 July- 



The caterpillar feeds inside the stems of the alder, 

 and also, it is said, the birch. 



SESIA ASILIFOKMIS. 

 Plate VI. Figure 7. 



THIS fly measures from one inch to nearly an inch and 

 a quarter in width. Male: front wings dark blackish 

 brown with, a blue tint, inclining to be transparent towards 

 the base. Hind wings transparent, with dark blackish 

 brown fringes. The body, which is bluish black, has five 

 yellow rings, the two intermediate ones very slender, the 

 antenna? are pectinated. The head and thorax bluish 

 black, with a yellow collar, and a stripe of the same 

 on the side of the latter. The tail-tuft black, with two 

 streaks of yellow lengthwise. 



The body of the female has three yellow rings. 



A locality for this species is Epping, but it is also 

 said to have been taken in woods in Surrey, Kent, and 

 Middlesex, and near London. 



The "date of the appearance of the perfect insect is 

 in June. 



The date of the appearance of the caterpillar is in 

 April. 



