THE EARLIER STAGES OF PERONEA MACCANA, TR. 258 



The Rev. J. W. Metcalfe, whilst staying last year in the 

 Eannoch district, obtained a number of Tortrix larvaB from 

 Myrica gale and Vaccinium, and from these bred imagines of 

 P. maccana and P. rufaiia, without, however, identifying the 

 larva of either species, or separating them (see 'Entom.,' li, 

 p. 265). 



Mr. Metcalfe very kindly described to me the spot in which 

 most of these larvae were obtained, and this year I found 

 considerable numbers -of both there. For the ova of P. lipsiana 

 I am indebted to the kindness of Mr. F. G. Whittle, who 

 forwarded to me females from Eannoch in the spring of 1918 ; 

 unfortunately these ova were not fertile, and I am unable to- 

 deal with the earlier histars of the larvfe of this species. 



P. maccana, Tr. 



Larva in last instar and full-grown, about 13 mm. long; 

 head amber- coloured— in some instances light brownish-green — 

 and glabrous; black round the mouth, on each side of the 

 mouth is a black round dot, very small but conspicuous. 

 Prothorax is the same colour as the head but it is not glabrous ; 

 the segments at the rear of prothorax, claspers and prolegs are 

 light bluish-green; there are very slight traces of an anal plate, 

 the tubercles are prominent and noticeable, the spiracles 

 inconspicuous. 



These larvae were to be found of all sizes, from what was 

 probably the second instar to those ready to pupate, about the 

 middle of July; they were practically identical in all stages, and 

 were easily recognisable from any other larva feeding at the 

 time on the same plants — in fact, I had no difficulty in separating 

 them. The distinct black spot on each side of the head would 

 at once distinguish them from any Tortrix larva that I can 

 remember having seen. 



They were found both by Mr. Whittle and myself in con- 

 siderable numbers in the Black Wood upon Vaccinium vitis-iihea 

 and V. myrtilliis, and on the open moors to the west of it in the 

 vicinity of the Camghouran Burn upon Myrica gale. 



Whether feeding upon Vaccinium or Myrica they spun the 

 leaves of a shoot together, forming a tube and living therein. 

 The pupa is about 7 mm. long and 1-75 mm. broad; the head, 

 thorax and wing-cases are yellowish-green, smooth and some- 

 what glabrous ; the abdominal segments are reddish-brown ; the 

 head is rounded, and there is no trace of a pupa opener ; 

 the wing-cases reach to the centre of the fifth abdominal 

 segment ; the abdominal segments taper gradually and regularly 

 to the anal segment, which terminates in a square end 

 looked at from above ; at each point of this is a hook which 

 points ventrallj'. (This arrangement of gradually tapering 

 abdominal segments, square end and hooks, applies to the pupae^ 



