187S.] 291 



food, towards the last, they were entirely kept, until they became mature one after 

 the other, from May 20th to June 5th; the perfect insects appeared from 

 August 10th to 21st. 



The egg of chi is semi-spherical in form, or rather elliptical at top and flattened 

 beneath at its greatest diameter ; deeply ribbed and reticulated ; when first laid it is 

 yellowish, and in a few days turns gi'eyish-brown, and, about a week before hatching, 

 a broad zone of flesh colour appears below, while the upper part is a rich crimson- 

 brown ; at this time, in respect of colour, variations occur ; some of the eggs have 

 a narrow zone of blackish at a distance of two-thirds from the base, while the top 

 is irregularly blotched with this colour. 



The young larvae, when first hatched, were pale olive-greenish, the large head 

 pale brownish with distinct black dots and hairs ; but they became in a couple of 

 days rather bluish-green. By April 23rd, the most forward had become half-au-inch 

 in length, very slender, and of a full, deep green colour, with the lines and also the 

 dots paler green : by May 15th, the biggest had grown one inch in length, still 

 slender in proportion, and rather less deep in coloui*, which, by the 19th, had changed 

 to a yellow-green, and then the fine lines were whitish : by the 27th, the larvae were 

 in their last coats, and presented but little variation in details ; their attitudes were 

 graceful amongst the twigs of sallow and willow, as they bent and elongated them- 

 selves when feeding near the extremities of the leaves. 



The full-grown larva is one and five-eighths of an inch in length, veiy slender in 

 proportion, cylindrical, though tapering a little at either end, the head rounded, and 

 the antennal papillae well developed, the segmental divisions very delicately defined, 

 as well as the intermediate wrinkles, so that the skin appears very smooth and soft. 

 The colour on the head and back is a delicate bluish-green, quite opaque on the back, 

 the dorsal line very thin, a mere pale thread and edged with darker green than 

 the ground colour ; the sub-dorsal line is whitish, better defined, and also edged with 

 darker, indeed, this line on the thoracic segments is white ; beneath it, as far as the 

 spiracles, the colour is a ti-ansparent yellowish, or else a full green, so clear as to 

 show the branchial vessels through it, this colour deepens gi'adually below till it 

 terminates in a fine blackish-green line, along the lower edge of which are the white 

 spiracles outlined with black ; a brilliant pure white stripe follows, very broad along 

 the middle segments, and a little attenu.ated at each end, often extending along the 

 side of the head towards the mouth, and ending behind at the extremity of the 

 posterior leg ; all the legs and belly are rather paler and more yellowish-green than 

 the back ; after the thoracic segments the tubercular dots are ranged in threes on 

 either side of the dorsal line, they are paler than the ground, and sometimes ringed 

 with a little darker colour. 



The variations seem to be in the depth of the general ground colour, more or 

 less blueness of the green, and the presence or absence of a small blackish oval ring 

 with whitish centre, or false spiracle on the side of the third and fourth segments. 



When full-fed, the larva makes a decided cocoon under the surface of the soil, of 

 bits of earth, somewhat toughly spun together ; the pupa is nearly six-eighths of an 

 inch long, smooth and regular in outline, tapering gently to each and, the last seg- 

 ment of the abdomen terminating rather bluntly, and furnished with a knob, from 

 which is emitted a pair of very fine (quite bristle-like) hooked spines ; the colour of 

 the pupa is reddish-brown, and the sm-face glossy. — -Wm. Buckler, Emsworth : 

 March, 1873. 



