1914.] 27 



mesothorax, 33 mm., at third abdominal segment 39 mm. in a fairly large 

 specimen. They vary much in colour : some are pale green, with the abdomen 

 rather more yellow, or the thorax, wings, and appendages tending to olive, and 

 a slightly darker dorsal line on abdomen. One or two are very unicolorous, of 

 a very pale yellowish green. In others the abdomen is a dark grass green, the 

 thorax darker, and the wings as if with a wash of black, almost black rather 

 than green. In some the dorsal line is distinctly reddish. In some of the 

 darker examples the wing nervures are very distinct as paler lines ; in the 

 lighter ones they do not show, though the tracheae can be seen in the trans- 

 parent tissue, best with a lens. 



Some of the darker ones preserve much of the larval coloration and 

 markings, this is common in Lycamids, when the pupa? have newly moulted, 

 they retain it for several days. There are a great many very minute hairs, 

 requiring a lens to see them. 



Most of the pupa) emerged in a few weeks, periods no doubt 

 affected by change of climate in travelling, but about a dozen of the 

 argyrognomon did not emerge, and though they did not look dead, did 

 not seem normal. These laid over the winter, and in the following 

 spring there emerged from each a specimen of an Ichneumon which 

 Mr. C. Morley tells me is Agryjwn anomelas, Grav. They escape by 

 cutting off a circular lid from the head end of the pupa. It is obvious 

 that the great care taken of these larvae by the ants affords no com- 

 plete protection against Ichneumon attacks. 



Figs. 1, 2, 3, 4, 6, show various colourings of the larva of P. argy- 

 rognomon, and as a matter of fact, there are so many intermediate 

 colorings that a dozen or more figures would not exhaust the varieties. 

 The honey-gland, which is fairly conspicuous in the living larva, is 

 shown as on the 8th instead of the 7th abdominal segment in figs. 1 

 and 3, by some error in counting the segments. It seemed better to 

 reproduce the drawings as originally made, rather than correct them 

 when living larvae were no longer available. Figs. 5, 7, 8, 9, show 

 various aspects of the larva of A. damon. The differences between 

 these figures are more due to attitude and aspect than to any differ- 

 ences in the larvae, which are very nearly constant in colouring, much, 

 therefore, in contrast to the polymorphic P. argyrognomon. 



I have added photographs of the skins of the first stage larvae of 

 argyrognomon, and of argus (segon) for comparison, x <>7. The 

 latter (argus) is described in Tutt's Brit. Lep., Vol. X, and the skins 

 of the 2nd and 3rd instars are figured. Argyrognomon in the iiisf 

 instar is seen to be rather smaller, and of more delicate texture than 

 argus (segon), but the hairs are (all apparently) very decidedly longer 



