1893.] 13 



characteristic feature of the full-grown larva is foreshadowed in the 

 dense covering of downy hair, each hair springing from a wart or 

 raised spot beneath the skin. The body gradually loses its dark look, 

 and by the second moult the general colour corresponds very nearly 

 with the food-plant, i. e., a clover leaf. "When examined under a 

 microscope, the larva of Hyale reminds one in some respects of the 

 larva of Antlwcharis cardmnines — the body green, shading off to a 

 white side stripe, and covered very thickly with warts, each of which 

 produces a single hair. There is, however, no clear design in the 

 position of these warts, and they appear to vary in size and prominence ; 

 the w^hite line, moreover, is narrow when compared with the side stripe 

 of cardamines larvae, to the naked eye, however, these likenesses are 

 not at all striking. The yellow spots below the white stripe are only 

 faintly visible in this stage. 



After the next moult, i. e., the fourth and last skin, the larva 

 attains to a length of rather more than one inch, and by those who 

 have seen full grown larvae of G. Edusa would readily be mistaken for 

 that of this species, were it not that the dense covering of short hair, 

 and the extension of the orange spots adjoining the spiracles indicate 

 a reliable distinction. Speaking concisely, the full-grown larva of C. 

 Hyale is of a deep green, thickly covered with short hair, and having 

 a white stripe running the length of the body above the spiracles. 

 Adjacent to each of the spiracles, and prolonged so as to give the 

 appearance of a blotch, is an orange-yellow spot, and in some speci- 

 mens these spots would seem to compose a broken line, hence probably 

 the error frequently made in describing this larva as being "green, 

 with four yellow stripes." 



When full-fed, the larva spins a few leaves loosely in the form of 

 a tent or temporary covering, and fastening itself at the anal extremity 

 to a convenient object, passes a silken cord over the back and changes 

 in an upright position to a pupa after the manner of the larva of 

 Gonefteryx rlimnni. The pupa is almost identical in shape with that 

 of Edusa, being perhaps a little less rounded, and not so bulging at 

 the centre ; green, whitish at the back, the wing-cases with several 

 (generally six) dark spots at the hind-margin of the fore-wings ; there 

 is also a dull brown mark on each side of the body below the wing- 

 cases. In each of the two cases in Avhich pupae were obtained the 

 imago emerged in twelve days, on 22nd and 25th November. 



It may be well to note, by way of conclusion, that at the present 

 time, December 20th, three of the surviving larvae are attempting 

 hibernation in that state. 



Grasmere, North Finchley, N. : 

 December 2,0th, 1892. 



