COLIAS IV. 
the magnitude of the discal spot with its ferruginous rings and patch. This is 
the typical character, but there are intergrades connecting this form with Kee- 
loaydin. % 
EURYTHEME. Egg. — Length .06 inch ; narrow, fusiform, tapering evenly 
from the middle to either extremity, the base broad, the summit pointed; 
ribbed longitudinally and crossed by numerous striae; color buff-white when 
first deposited, after one or two days changing to crimson, and near the close' 
of the stage to black. (Fig. a.) The larva emerged after six days in August, 
nine days in September. 
Young Larva. — Length, .05 inch; cylindrical, -of even diameter to eleventh 
segment, each segment several times creased, and on the ridges thus formed 
many black points, from which spring white hairs ; color dark brown or choco¬ 
late ; head obovoid, granulated, dark brown. (Fig. b.) Duration of this stage 
in August two days, in September five. 
After first moult: length .125 inch; shape as before ; body covered with mi¬ 
nute black tubercles, disposed on the ridges so as to form both longitudinal and 
transverse rows, each tubercle sending out a white hair; color dull green, head 
obovoid, dark brown. To next moult in August five days, in September four¬ 
teen days. 
After second moult: length .28 inch; color dark green; tuberculated as be¬ 
fore ; pilose ; head as before. (Fig. c.) To next moult in August six days, in 
September seven days. 
After fourth moult: length .56 inch, color darker green, but varying, some 
examples having the sides only dark, the dorsum yellowish, the sub-dorsal stripe 
sometimes wanting, but usually more or less defined ; at the posterior end of 
each segment from 3 or 4 to 10 or 11, it becomes thickened, forming a distinct 
spot rather, while elsewhere it is faint; many examples show a red streak on 
each of these spots, and not unfrequently there is a black dot exactly under the 
feebly-defined, fragmentary line of greenish-white ; head obovoid, yellow-green. 
(Fig. d.) To next moult in August five days, in October ten days. 
After third moult: length, .45 inch ; cylindrical, long and slender ; color dark 
green; tuberculated and pilose as before ; at base of body now appears a white 
stripe through which runs a crimson line, and under this stripe are black semi- 
- 
circular or ovate spots, sometimes only seen on segments 3 to 6, but usually from 
3 to 11, diminishing in size posteriorly; in some examples these spots are wanting; 
at the beginning of this stage there is no indication of a sub-dorsal line, but 
presently appears a line paler than the ground, which gradually changes into a 
white spot on segments 5 to 10. (Fig. e.) To maturity in August seven days. 
