%\t Canadian (fetomotagist 



VOL. XX. LONDON, FEBRUARY, 1888. No. 2 



DESCRIPTION OF THE PREPARATORY STAGES OF 

 COLIAS CAESONIA, Stoll. 



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



Egg. — Fusiform, thick in middle, tapering to a small rounded summit ; 

 marked by about 18 longitudinal ribs, these being low, narrow, the spaces 

 between flat and crossed by many fine ridges. Color yellow-green. 

 Duration of this stage about four days. 



Young Larva. — Length .08 inch; cylindrical, thickest anteriorly; on 

 the ridges of the segments many black points, each with a short black 

 hair ; among these are black tubercles, some with long hairs, but most 

 with white clubbed appendages, which form three longitudinal rows on 

 either side, one appendage in the row to the segment ; these rows are 

 sub-dorsal, upper and lower lateral ; color greenish-white, with a tint of 

 brown ; head rounded, a little depressed at top ; on the face many rounded 

 tubercles, each with depressed black hair ; color pale yellow-brown. 

 Duration of this stage four to five days. 



After first moult: Length .14 inch; the ridges thickly beset with 

 black points, each with black hair ; among these are small tubercles of 

 same color, mostly on middle of each ridge, with longer hairs ; along base 

 a yellowish narrow stripe, and over it, on 3 and 4 each, a rounded black 

 process ; another larva showed this stripe only near the close of the stage, 

 and had not the black process ; color yellow-green ; head rounded, 

 nearly same green as the body, the tubercles and hairs more numerous 

 than before. To next moult four to five days. 



After second moult: Length .21 inch; color yellow-green, with yel- 

 lowish basal band ; the processes on 3 and 4 as before, shining, black ; 

 head yellow-green, more thickly covered with small tubercles, scattered 

 among which are others, larger. To next moult three to four days. 



After third moult : Length .32 to .38 inch ; color yellow-green, the 

 band greenish-white ; the two processes on 3 and 4 present ; on dorsum 



