THE CANADIAN ENTOMOLOGIST. 217 



DESCRIPTION OF PREPARATORY STAGES OF ARGYNNIS 



IDALIA, Drury. 



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



EGG — Shaped like that of Diana and Cybele ; conoidal, truncated, 

 rounded at base, the sides well rounded ; depressed at summit ; marked 

 vertically by about 18 vertical ribs, somewhat wavy, half extending from 

 base to summit, the remainder ending irregularly at about three-fourths 

 the distance from the base ; between each pair of ribs are equi-distant, 

 transverse, slightly raised striae. Duration of this stage about 25 days. 



YOUNG LARVA — Length .08 inch ; cylindrical, somewhat thickest 

 in middle ; color pale yellow-brown, translucent ; each segment from 3 to 

 12 marked by a transverse row of eight elongated, sub-ovate, tubercular 

 dark spots, of which six lie on dorsum and upper part of side, and one 

 below spiracle, the whole forming eight longitudinal rows ; from each spot 

 spring one or two long black curved hairs ; head scarcely broader than 

 2nd segment, rounded in front, bilobed, the vertices rounded, sparsely 

 pilose. The larvae at this stage cannot be distinguished from Diana, 

 Cybele or Aphrodite. The 1st moult occurred 23 days after the close of 

 hybernation. 



After 1st Moult — Length .15 inch, cylindrical, stout, tapering from 

 middle either way ; color cinereous, mottled and striped with brown ; a 

 macular stripe running with the dorsal rows of spines, and another just 

 outside 1 st laterals ; the spines form six longitudinal rows, two dorsal and 

 two on either side, and are long, fleshy, black, each beset with short black 

 hairs ; head black. Duration of this stage 12 days. 



After 2nd Moult — Length .3 inch ; stouter; mottled and striped with 

 light and dark cinereous ; the spines longer, more tapering, each dull 

 yellow at base ; head black. Duration of this stage 15 days. 



After 3rd Moult — Length .7 inch; same shape; the dark portions 

 quite black, the light of a dirty white ; on dorsum a white stripe through 

 which runs a black line ; at the junction of the several segments a trans- 

 verse white stripe, on which are short black lines ; each segment crossed 

 longitudinally by black stripes, interrupted by the spines, with a wedge- 

 shaped mark between the spines ; these are long, shining black, with 

 black bristles, and mostly rise from pale orange tubercles ; head flattened 

 frontally, bilobed, the vertices rounded ; color light brown. To next 

 moult 17 days. 



