THE CANADIAN ENTOMOLOGIST. 277 



pupation the larva becomes of a rather dirty greenish-white colour, very 

 plump, especially about the middle. The larva, when contracted for 

 pupation, lies curved on its back among the grass without any attempt at 

 spinning silk, just as Edwards figures it. First one pupated 15th Aug., 

 the second on the ryth, the third on the i8th, the fourth failed to pupate 

 and died, the fifth pupated on 29th. 



The fourth stage was thus from thirteen to sixteen days. 



Pupa, when first formed, is of a creamy colour, very similar to that 

 of the grub of a Tachina fly when it has just emerged from the body of 

 its victim before it contracts and hardens into the puparium. The brown 

 markings appear in the course of an hour or two, and the description is 

 then as follows : — 



Pupa.— Length, 11.7 mm. Pale horn colour, streaked and spotted 

 with dark brown ; cylindrical ; abdomen stout, conical, with a slightly 

 curved, ]:)ointed tip. The abdominal segments are margined with brown, 

 especially at the sides, and are also spotted with brown, The spiracles 

 are orange. There are brown stripes in the interspaces of the wings, and 

 the antennae, tongue and feet-cases are also marked with brown. 



The first pupa was seen to be black, and the wing markings showing 

 on 27th Aug., and it emerged early on the 28th, and was a 9 '> the one 

 that pupated on 17th gave the imago, a $ , on 29th; the one which pupated 

 on 1 8th gave the imago on 30th, and the one which pupated on 29th 

 Aug. gave the imago on 9th Sept. 



The pupal period thus varied from thirteen to eleven days. 



The average of the first three gives a period from oviposition to 

 imago of from sixty-eight to seventy days. 



The points in which my observations chiefly differ from those of Mr. 

 Edwards are : — 



First : As to the egg which Mr. Edwards describes as having thirty- 

 five ribs, while my count gave in one case twenty-two and in another 

 twenty-four, it was impossible for me to get all the eggs which I had 

 into a position where the ribs could be counted, but I thought that two 

 out of about a dozen should yield a fair average. It is true that there is 

 variation in the number of ribs in the same species and even in the same 

 individual, but the difference between twenty-four and thirty-five seems 

 hard to account for. 



Second: Edwards describes four moults, the larva hibernating after 

 either second or third moult. 



