168 BRITISH BUTTERFLIES. 



(1) Yellotv-green form (two examples almost exactly alike in tint and markings ; 

 described May 27th, 1905). Head red-brown rather than black ; gronnd colour 

 yellow-green ; prothoracic segment with a bright red-brown tinge across the 

 prominent part transversely, the whole segment being inclined to an orange tint ; 

 the sloping sides yellow-green, the lateral flange and downwards to prolegs tinged 

 with red-brown, inclining to bright red on the 6th, 7th, 8th, and 9th abdominal 

 segments, where the red lateral line is very marked, the red line going round the anal 

 flange, and being prominent as a patch on the outside of the anal prolegs. The oblique 

 lines on sides slightly darker than ground colour of side. - The dorsal line on meso- 

 thorax dark (almost blackish), the median depression between the two elements of the 

 dorsal ridge, filled in with a number of bright red-brown chevrons (the point of each 

 to the front), on each segment From metathorax to 7th abdominal, that on the 7th ill- 

 developed ; the series thinning off into a dark line, ending in a dark brown patch on 

 the anal segment ; the reddish chevrons are more or less subdivided by a pale 

 greenish line ; the tops of the ridge-points are also faintly tinged with reddish, and 

 there is the slightest reddish tinge about the lateral oblique lines which have a 

 slightly transparent appearance compared with the more opaque ground colour 

 between them ; the longer tubercular hairs, and also the shorter white secondary 

 hairs, show very clearly against the darker areas of the ground colour. The area 

 below the lateral flange, the areas carrying tuberles vi and vii, and the upper 

 outside segment of prolegs, also tinged with red. Altogether a very pretty form. 



These larvas stopped feeding on May 29th, and, on May 30th, were 

 in the resting-positions in which they intended to pupate. They 

 turned to a distinct and somewhat uniform red during the period from 

 May 31st- June 2nd, and pupae were observed on the morning of 

 June 3rd. 



(2) Bright green form (described May 26th, 1905) : The whole of the body 

 bright green, with no darker areas whatever ; the apices of the segmental sections 

 of the dorsal ridges whitish-green ; the oblique lateral lines whitish-green ; the 

 lateral flange whitish-green ; the mediodorsal line of a deeper tint of green than the 

 ground colour. The coloration of the larva made up entirely of different shades 

 of green. 



This larva ceased feeding on May 27th, 1905, and took up resting- 

 position. On the 28th, the bright green areas had turned dark grey ; 

 the length had contracted to 9mm. ; the apical points of the raised 

 segmental sections of the dorsal ridge paler ; pale lines running there- 

 from partly down the sides between the abdominal segments ; a very 

 pale mediodorsal line from the lst-7th abdominal segment. The 

 tumid prothorax and the lower parts of meso- and metathorax along 

 the lateral flange green. On May 29th, these green thoracic areas were 

 very marked and evidently developing into the pupal wings ; the spiracles 

 pale; the anal segments so withdrawn that the 8th, 9th, and 10th occupy 

 little space. On May 30th, the green thoracic areas occupy full space 

 of pupal wings. On the morning of May 31st the pupa was observed. 



Foodplants. — Ulmus montana (Newman), seeds (Thornewill). leaf- 

 buds and leaves (Tutt), (Jim us alba (Hering), Ulmus campestris 

 (Hering, Moschler, Kranz), Ulmus saberosa, a variety with a curious 

 corky bark to the small branches, found at Leuk (Lowe). Ash 

 (Fraxinus excelsior) [Newnham notes (Ent. lice, vi., p. 33): " About 

 the middle of June, 1894, I obtained a nearly fullfed larva off an ash- 

 tree. I fed it for some days on ash, until it pupated; the imago 

 emerged on July 10th. "j [Meess and Spuler note the larva on 

 " elm, lime, and oak." The Verein Fauna in Lei pzig, records that 

 a "larva was found on Sali.c caprea, and the imago reared on this 

 food." We think that "lime," "oak," and "sallow" all require 

 confirmation.] [Miihlig beat the larva in June, 1853, near Hochstadt, 

 from sloe (Primus spinosa) and elm (Ulmus campestris) (teste Kalten- 



