COLIAS I. 



traces of sub-marginal spots on same wings ; on the under side the sub-marginal 

 clusters of scales on both wings are usually conspicuous. (Figs. 1-3.) The pre- 

 paratory stages of Eiirydlce are thus described : — 



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

 base flat ; ribbed longitudinally, the number of ribs about eighteen, four or five 

 of which end at nearly three quarters the distance from base to summit ; they 

 are low, narrow, of even height and width throughout, the spaces between flat 

 and crossed by many fine horizontal ridges; the micropyle (Fig. a^) in centre of 

 a rosette of five hexagons, outside of which is a ring of cells of same shape but 

 irregular; color yellow-green. (Fig. a.) Duration of this stage about five days. 



Young Larva. — Length .1 inch ; cylindrical, thickest on 2 and 3, tapering 

 sliglitly to 12 ; each segment several times creased, and on the ridges so made 

 are many black points, each giving a short black hair ; scattered among these 

 points are black tubercles, some with long black hairs, but most with white 

 clubbed appendages (Figs. W, ¥) ; on front of 2 is a cross row of the hairs, five 

 on either side, running from dorsum to base ; on 3 and 4 are four each, also in 

 front, but from 5 to 12 there are three of the white appendages on the side of 

 each segment, a subdorsal one on the front ridge, an upper lateral on fourth 

 ridge, a lower lateral on second ridge, or between second and third ; these form 

 three longitudinal rows, and the subdorsal extends over 4 ; 13 has three hairs in 

 triangle on either side, and from 4 to 12, below spiracles, are two hairs each, the 

 front one always a little below the other ; color dull yellow-green ; feet and legs 

 same; head rounded, a little depressed at top; on either side of face are seven 

 rounded tubercles, and two in the triangle, in all sixteen, each with long de- 

 pres.sed black hair; color of head pale yellow-brown. (Figs, h, 6^.) Duration of 

 this stage about four days. 



After first moult: length .14 inch; rather more tapering, the ridges thickly 

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

 same color, mostly on middle of each ridge and nearly equidistant, with longer 

 hairs (Fig. c^) ; color yellow-green ; head nearly as before, somewhat broader in 

 proportion across lower half ; the tubercles and hairs much more numerous than 

 before ; color pale yellow-green. (Figs, c, c^.) As this stage proceeds a yellowish 

 basal stripe begins to show itself. To next moult four to five days. 



After second moult : length .22 inch : color deep green ; the points and tuber- 

 cles as in previous stage ; the basal white band distinct ; just over it, on 3 and 4, 

 on middle of the segment, a black, vitreous, round process, almost a hemisphere ; 

 head yellow-green, more thickly beset with tubercles than before, mostly small, 

 but twelve, scattered among the others, are of larger size. (Figs, d, d?, d^.) To 

 next moult three days. 



