TR1F1D.-E. 25 



On the wing in September, October, and sometimes 

 November; more rarely, after hybernation, in March and 

 April. 



Larva cylindrical but tapering slightly from the fourth 

 segment to the head, which is full and rounded, pale bluish- 

 green faintly reticulated with darker ; body tapering a little 

 behind, delicate pale and bright yellow-green ; dorsal stripe 

 broad and very distinct, whitish-yellow, rather narrower at 

 each extremity ; subdorsal line well defined only on the 

 second segment, as is also the beginning of a faint line 

 below it ; on the remainder of the body these are very thin 

 and faint, composed of a series of short whitish streaks much 

 interrupted ; the remainder of the dorsal ground colour, 

 except the dorsal and anal plates, very finely freckled with 

 yellowish atoms ; raised dots whitish-yellow, each set in a 

 green ring ; spiracles oval, white, delicately outlined with 

 black ; along them the green colouring is a little deepened ; 

 below is a broad sulphur-yellow stripe, extending down the 

 front of the anal prolegs ; ventral surface similar in colour to 

 the back; prolegs of the same colour, provided with very 

 sharp hooks. A day or two before retiring to the earth it 

 becomes suffused with brown, deepening at the last to 

 purplish-brown. 



When just out of the egg it is of a pellucid yellowish- 

 green with a faint opaque yellowish-white dorsal line ; a few 

 days later the subdorsal lines begin to appear, and in a fort- 

 night these have become more distinct. (Adapted from 

 Buckler.,) 



May to the end of June or beginning of July on the 

 leaves of ash, remaining upon the tree and clinging tena- 

 ciously to the leaves or leaf-stalks ; but when full-fed leaving 

 the tree to spin up in the ground. 



Pupa red-brown, apparently undescribed. 



The moth seems never to be observed at laiye in the 



