272 THE ENTOMOLOGIST. 



segments are without the green tinge that is found in P. lipsiana, 

 and the points of the rows of spikelets are more pronounced 

 than in that species. 



Out of some five or six dozen larvse obtained, only twelve 

 imagines emerged between August 24th and September 16th. 

 There is one point about this species which is at present 

 unknown, and that is whether it deposits its ova in the autumn 

 or hibernates and deposits them in the spring. So far as I am 

 aware no one has seen a specimen after hibernation. 



P. schalleriana, L. 



Ova. — The ova is horizontal ; it is oval in shape. The surface 

 is glabrous and slightly opalescent, greenish-grey in tint ; it is 

 divided into a large number of irregularly shaped cells by slightly 

 raised ribs. These cells vary much in shape : those near the base 

 are opened out much more than those in the centre and towards 

 the micropyle ; the sides of these cells are all sinuous in outline 

 and not straight, as is the case in many Tortrix ova. Through 

 the envelope of the ova is seen, not very distinctly, a nucleus 

 which is buff coloured ; the diameter of this nucleus is about 

 •4 mm, by '3 mm. The size of the outer envelope is about 

 '67 mm. by '55 mm. ; the height of the ova is about "15 mm. 



This ova was deposited on August 26th, 1917, on the stem 

 of a spray of blackthorn, at the base of a bud ; others were 

 deposited in a similar position on a spray of whitethorn. 



The ova were examined on November 18th, 1917 ; the nucleus 

 was now orange in colour, and the ova resembled the orange 

 nodules Avhich are abundant on the stems of blackthorn ; the 

 diameter of the nucleus had increased and was then about 

 •55 mm. by '34 mm. ; the outer envelope was quite colourless 

 and very transparent, the nucleus had a well-defined outline and 

 showed up very distinctly. 



Larva.— A larva emerged April 23rd, 1918, length about 

 •7 mm. ; head intensely black, spiny and glabrous ; prothoracic 

 plate fuscous ; segments at rear of prothorax pale green, glabrous, 

 tubercles not prominent, prolegs darker than the prothorax. 



The larva feeds in this instar by burrowing into a sloe leaf 

 from the upper side, forming a chamber in the leaf and feeding 

 therein. On- May 1st the larva was in its second instar; it was 

 then 1"15 mm. long; it was similar in all respects except size to 

 the first instar. The third instar was reached on May 8th, the larva 

 being then 4 mm. long; it lived in a web on the underside of a leaf, 

 forming a dwelling between two of the main veins of the leaf ; 

 this leaf had been placed upon another leaf, and the larva fed 

 upon the lower cuticle of the upper and the upper cuticle of the 

 lower leaf. The head and prothorax were jet black and glabrous ; 

 the division between the two was distinct and of the colour of 

 the segments at the rear of the prothorax, i. e. light green ; the 



