84 THE ENTOMOLOGIST. ' 



The ova from which the foregoing description was made 

 was deposited by a captive female on a plant of A. alpimis, on 

 July 12tb ; it was then creamy white in colour ; on the 13th it 

 had changed to light red, and on the 14th to bright coral-red; 

 on the 20th it was leaden coloured. The larva emerged on the 

 22nd. It thus appears that the period of the ova stage is ten days. 



It will be seen, on reference to my description of the ova of 

 Colias iverdandi in ' Entomologist ' xliv. p. 122, that the ova of 

 these two species are identical in size and in all other respects, 

 except that in C. werdandi the colour changes to deep orange 

 instead of to coral-red, which the ova of C. hecla does. The period 

 of this stage is in the case of C. iverdandi two days longer. 



Immediately after emergence the larva was 1*50 mm. long. 

 The head was black, the remainder of the segments were dull 

 green, transparent and thickly studded with tubercles, each 

 tubercle having in its centre a spine. The larva at this stage 

 eats holes in the upper cuticle of a leaflet of its food-plant, and 

 rests stretched out at full length on the midrib thereof; it 

 changed into the second stage on July 27th, and was then 2 mm. 

 long and stout in proportion to its length. Colour dull green, 

 very spiny, head greenish brown, spiny and shining, the re- 

 mainder of the segments had a dark medio-dorsal stripe, lighter 

 subdorsal area bounded below by darker stripes. The spiracular 

 stripes are lighter than the remainder of the surface of the larva. 



The change to the third stage took place on August 22nd. 

 The larva was then 4 mm. long; head light amber-coloured; 

 dorsal area dull dark green ; subdorsal areas light green of the 

 same tint, bordered on the lower edges with dark stripes of the 

 same tint as the dorsal area. The spiracular stripes were of 

 lighter green, the ventral area was of the same tint as the sub- 

 dorsal. All the segments were thickly covered with black 

 tubercles, each one of which emitted a black spine. The 

 spiracles were light green with black circumferences. On 

 August 29th the larva was slowly feeding ; on September 6th it 

 ceased feeding altogether, and was placed in a cool cellar in a 

 flower-pot which contained dry sand and Sphagnum. 



My stock of ova when I left Laxelv on July 16th was twenty- 

 two, but by the time I reached England, on August 3rd, they 

 had been reduced to half a dozen more or less unhealthy larvae. 

 A. alimms is a most difficult plant to transplant or to keep fresh 

 and healthy when it is dug up, and all my plants were yellow 

 and unhealthy on arrival at home. Of these half dozen larvae 

 only two reached the hibernating stage, and one of these two 

 died soon after being placed in winter quarters, reducing my 

 stock early in October to a single specimen. 



This larva remained quiescent and stretched out on the 

 Sphagnum. 



I had intended, upon the first sign of frost appearing, to 



