226 THE CANADIAN ENTOMOLOGIST. 



DESCRIPTION OF THE PREPARATORY STAGES OF 

 LIBYTHEA BACHMANNI, Kirtland. 



BY W. H. EDWARDS, COALBURGH, W. VA. 



EGG--In shape are oblate spheroid, somewhat pointed at base, and 

 a Httle truncated and depressed at summit ; marked by many horizontal 

 strice, and longitudinally by i8 or 20 narrow, prominent ribs, which pro- 

 ceed from base and terminate, some of them irregularly, at about four fifths 

 the distance to summit, while eight, increasing gradually in prominence, 

 end abruptly at the rim of the summit ; these long ribs are cut on either 

 side by grooves perpendicular to the surface of the egg ; they are also 

 frequently deflected somewhat from a direct line ; color pale green. 

 Duration of this stage about 4 days. 



YOUNG LARVA — Length just from egg .04 inch; cylindrical; the 

 segments a little rounded, and four times creased transversely ; covered 

 with a fine short down ; color green, semi-translucent ; head twice as broad 

 as 2; obovoid, a little depressed at suture, the vertices rounded ; sparsely 

 pilose; color yellow-brown. To ist moult about 2 days, in July. 



After First Moult — Length .08 and .09 inch ; color brownish-green, 

 the segments curved ; head a little broader than 2, shape as before ; color 

 yellow-green. To next moult 2 days. 



After Second Moult — Length .12 inch ; same shape ; upper side dark 

 green ; a faint shade of yellow over and along basal ridge, rather macular ; 

 under side, legs and feet lighter green ; the segments much specked with 

 faint white on the ridges caused by the creases ; on 3, high up, a black 

 dot on either side ; head as before; color 'light green. To next moult 

 2 days. 



After Third Moult — Length .26 to .28 inch ; color dull green, yellow- 

 ish along and over basal ridge ; specked with pale white, or yellow white, 

 as before ; the black dots as before ; head green. To next moult about 

 2 days. 



After Fourth Moult — Length .4 inch. Four days later the larva 

 reached maturity. 



MATURE LARVA— .7 to .9 inch; cylindrical, thickened at 3 and 

 4, the dorsum of last segment abruptly curved down to the end ; color 

 dark green, the lower side, and also feet and legs, pale green ; each seg- 

 ment four times creased transversely and on the flat ridges so caused are 



