COLIAS IV. 



With the later brood of hirva) this period was greatly protracted by the cold 

 weather, reaching twenty days and more. 



Mature Larva. — Length 1.1 to 1.2 inch; cylindrical, of even thickness, 

 tajjering on the last segments ; each segment several times creased, and on the 

 ridges so formed are numerons tine papillae, mostly white but many black, and 

 each sending out a fine, short, white hair ; color dark green ; at base of body a 

 band of pure white through which runs a bright crimson line from segments 2 

 to 11, almost continuous, seen faintly on 13 ; and beneath this band from 3 to 

 12 is a large semicircular or semi-ovate black spot on each segment, the ante- 

 rior ones largest, the rest diminishing gradually ; on the edge of dorsal area is a 

 faint whitish line, thickened at the posterior end of each segment so as to pre- 

 sent well-defined white spots ; next above the white line is one of crimson, 

 broken on each segment, and usually well-defined only just above and near the 

 white spots ; beneath these last, on the last ridge of each segment from 5 to 10 

 is a black dot ; under side, feet and legs pale green ; head obovoid, pale or yellow 

 green. There is much variation in the mature larva with respect to the sub- 

 dorsal lines. 1 have seen no living example in which they are wholly absent, but 

 I have an alcoholic one received from Mr. Dodge in which there is no trace 

 whatever of these lines, and the larva looks like that of Ph'dodice. So I have a 

 carefully drawn and colored figure from the late Dr. H. K. Hayhurst, which 

 shows no trace of these lines. (Fig. e.) On the other hand, one in alcohol from 

 Mr. Dodge shows a broad, continuous white stripe, like that at base, only a trifle 

 narrower. Mr. Bean says, " The glass showed the upper line to be white, edged 

 with yellow only, there l)eing no trace of red whatever, but the day after, the 

 line was unmistakaljly margined with confused crimson and yellowish." I re- 

 ceived a number of larvae in their last stages from Mr. Bean, and my notes read, 

 " In some, the white, crimson, and black of upper band are distinct ; some have 

 no trace of the black, some neither of black or crimson ; and in some the white 

 line fades till nothing remains but the thickened end on each segment, and this 

 may be represented by a dot or minute spot only." (Figs, e, e^, e'".) 



Chrysalis. — Length .85, breadth .09, greatest depth .11 inch; compressed 

 laterally, the thorax prominent, abdomen tapering, mesonotum rounded, head 

 case pointed ; color of anterior part and of Aving cases dark green, of abdo- 

 men ' yellow-green ; a light buff stripe on either side of abdomen from the end 

 of wing cases to extremity, and on the ventral side of this stripe, a demi-band 

 of dark brown ; between the stripe and band three black dots, one on each seg- 

 ment ; on the wins; cases there is a submarg-inal row of black dots, one on each 

 interspace, and on middle of the disk is a small black spot. (Fig./.) Duration of 

 this stage in September fifteen days. Of the later brood the periods varied, the 



