19 



SESIA CULICIFORMIS. 



Plate V. Figure 6. 



THIS species varies from about ten lines to an inch 

 or a little over an inch in the width of the wings. 

 Male: front wings transparent, having a blue gloss when 

 held to the light; blue-black on the upper edge, the 

 bar the same, and the outer edge with a tinge of purple 

 violet; the lower edge reddish towards the base. The 

 hind wings have the fringe blackish. The body is blue- 

 black, with a broad ring of red tinged with fulvous; 

 the head and thorax blue-black; the tail-tuft black. 

 The flight of this species is rapid. 



Localities for this species are York, Gravesend, Man- 

 chester, Epping, Dublin, Coburg-road, and other places 

 near London. 



The situations where it is found are open places in 

 woods. 



The dates of the appearance of the perfect insect arc 

 the end of May and the beginning of June. 



The caterpillar is pale dull yellowish white, the second 

 segment dull yellow, the head brown. 



The date of the appearance of the caterpillar is in April. 



It feeds on the interior of the stems and branches of the 

 birch, and also of the alder; and likewise, according to 

 Mr. Westwood, on the wood of the plum and the apple. 



.SESIA FORMIC^EFORMIS. 

 Plate V. Figure 7. 



THIS very neat insect measures across from ten lines to 

 eleven and a half. Male : front wings transparent, black 



