60 ORTROSIA SUSPECTA. 



with black, a streak of black extending from the top 

 of each lobe being most noticeable; a narrow, polished 

 black plate on the second segment ; dorsal line almost 

 clear white, and on the dark ground is very conspi- 

 cuous ; subdorsal lines very indistinct — except in the 

 plate on the second segment, where they show clearly 

 — and seem to be composed of an interrupted series 

 of faint bluish-white streaks and dots ; on each seg- 

 ment between the dorsal and subdorsal lines is a 

 large square purplish-black mark, and these marks, 

 together with the pale dorsal line, form the most 

 noticeable feature in the larva. There are no per- 

 ceptible spiracular lines, but the spiracles are black 

 and very distinct. The usual trapezoidal dots small 

 and indistinct, of the pale colour of the subdorsal 

 lines. 



Ventral area and pro-legs uniformly dingy glaucous- 

 green, with a purplish tinge; the anterior legs pale 

 straw-colour, and having immediately in front, and 

 also immediately behind each of them, a short black 

 streak. 



The larvse fed up well on birch, and on or about 

 May 23rd, both dissappeared below the surface of the 

 earth for pupation. 



The moths, perfect specimens, emerged together on 

 June 16, a month earlier than the species is usually 

 seen in a wild state in Yorkshire. (GL T. Porritt, 7th 

 January, 1893, E.M.M., XXIX, 41, February, 1893.) 



As Mr. Porritt did not see the young larva of 

 0. susjpecta, I add a few notes of my own observa- 

 tions : 



The eggs were packed closely together side by side, 

 and appeared to have been thrust in between two sur- 

 faces, and it resulted both from this (if so) and also 

 from a real identity, that they reminded me greatly of 

 those of Gerastis vaccinii. A closer examination only 

 confirmed this impression ; the diameter was 0*8 mm., 

 most of the eggs were more or less distorted, indented, 

 or flattened, so that it was only by securing a favour- 



