104 PKAR. [1890 



shape and whitish in colour (from the upper coat of skin being dead), 

 slightly raised in the middle, and of a somewhat transparent tint 

 just (u-cr the r,int((i)U(l c(i(j, which was a soft mass, compressible, thick, 

 and somewhat circular in outline. These little white blisters, or 

 patches, of white dead skin roverhn/ the effijs, were about one-sixteenth 

 of an inch across, and on one leaf where I counted them, over thirty 

 in number, on another there were about twenty five ; all these (with 

 possibly one exception ) showing on the upper surface of the leaf. — 

 (E. A. 0.) 



The procesa of e(j(i-layinii, which I had not the opportunity of ob- 

 serving, is thus described by Mr. C. L. Marlatt in his paper on habits 

 of the "Pear Slug," referred to in note at p. 102, ante: — "But one 

 egg is deposited in a place, and it is always inserted from the under 

 side of the leaf. The ovipositor is thrust obliquely through the leaf 

 to the upper epidermis, but not piercing the latter, and shows there 

 distinctly through the transparent upper skin of the leaf." [The 

 description is accompanied by a figure. — E. A. 0.] "The saw-like 

 instrument, when brought into the position noted, is moved rapidly 

 with a swinging lateral motion from side to side, cutting the upper 

 epidermis free, so as to form an irregular cell or pocket of peculiar 

 flattened ovoid outline. The egg is quickly passed down between the 

 plates of the ovipositor, and dropped into the pocket thus made, the 

 time occupied being a little over one minute for the entire operation. 



. . The egg is oval, slightly flattened on one side, and remains 

 in its peculiar cell for a period of about two weeks before the larva 

 escapes." — (C. L. Marlatt : see paper previously referred to.) 



Mr. Newstead's description of the egg in his paper, from which I 

 quote at length further on, agrees very nearly with the above : — "Form 

 subcircular, slightly flattened, shining. . . . It is laid on the upper 

 surface of the leaf beneath the epidermal layer." — (K. N.) 



In my own observations, taken from specimens sent me on 

 June 14th, 1898, I had the opportunity of seeing the Sawfly larva 

 whilst still in the e^g. Most of the larva) had hatched out, leaving 

 only the white skin cracked where the maggot had efiected its escape, 

 but two eggs still remained unhatched. One of these eggs contained 

 the white Sawfly larva curled on itself within, and sufficiently deve- 

 loped to be of characteristic shape — that is, with the largest segments 

 behind the head, and the hinder portion of the maggots with the 

 segments much narrower transversely. In the other egg the contents 

 were not yet sufliciently developed to be defined in shape. I did not 

 see any larvae in the act of coming out of the egg, but the smallest of 

 them were as a general thing of a yellow colour. — (E. A. 0.) 



As recorded by Mr. Marlatt, the larva at first is clear or free from 

 slime, and in colour nearly white, except the yellowish-brown head. 



