MARCH, 1863. 213 



trunk. Its mine is extremely long and very narrow, being 

 only a tract beneath the young and delicate cuticle of the 

 branches, sufficiently wide to accommodate the body of the 

 miner. At first it is difficult to detect the mine, but after 

 some months it is easily traced by the elevated line of reddish- 

 brown matter that marks the course of it. Thus it is easily 

 found in early spring before the buds have expanded, and the 

 larva may be sought in April and is easily reared. In the 

 spring the larva is of a dark lemon-yellow colour without 

 markings, and at this time the larva can be seen through the 

 cuticle of the branch. About the middle of May, or rather 

 about the 10th of the month, the larva will be found banded 

 alternately with red and yelloAv, with two black dorsal dashes 

 on the second segment. (I regard the head as the first.) 

 This is the indication that it has reached its maturity, and in 

 a day or two it cuts the cuticle and leaves the mine to Aveave 

 its cocoon, sometimes in the angle of a bud, on the branch of 

 which it has been feeding, and sometimes on adjacent sub- 

 stances. 



In rearing this insect, it is simply necessary to thrust the 

 branches of the willow into wet sand contained in some 

 convenient vessel, and to protect them so that the larva? cannot 

 wander after leaving their mines. 



The perfect insect appears after a pupation of about a 

 month, or, as in the case of one specimen specially observed, 

 in twenty-six days. It may be found as an imago, therefore, 

 about the middle of June. 



Glypihpteryx, Hiibner. 



Wings oblong or elongate, Avith moderately long cilia. 

 Hind-wings rather ovate or lanceolate. The costal vein is 

 conspicuous, free and simple. The subcostal simple, attenu- 

 ated towards the base. The discal vein gives rise to tAvo 

 discal nervules. The median subdivides into three branches, 

 the upper tAvo arising from a common base. 



In the anterior Avings the secondary cell is distinct and the 



