COLIAS IV. 



the magnitude of the cliscal spot with its ferruginous rings and jxatch. This is 

 the typical character, but there are intergrades connecting this form with Kee- 

 waydin. 



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; cj-lindrical, 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. h.) 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, dai'k 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 fixint ; many examples show a red streak on 

 each of these spots, and not nnfrequently 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 beo-inning 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. 



