82 THE EEPOET OF THE No. 36 



calyces had closed up to the time when the fruit of the Spy trees was one-quarter 

 inch in diameter. Lygidea mendax in Ontario and in New York hatches most 

 freely just as the blossoms are opening out well. Of Lygus invitus in Nova Scotia 

 the maxinmm hatching takes place during the period of maximum bloom, and of 

 Heterocordylus malinus in Ontario during the period from the time the Spy 

 blossoms are opening up to full bloom. Of Paracalocoris colon in Ontario the 

 records are not definite, but nymphs gathered at Woodburn in 1912 with 

 N. nubilus were in the same instar, suggesting that they may have hatched about the 

 same time. However, in 1912 N. nubilus seemed to hatch somewhat earlier than 

 in 1915; thus making" impossible the assignment of a date of hatching for Para- 

 calocoris colon. From this comparison it can be seen that a spray designed to 

 control the other Capsids and. which could be applied at the time of the spray for 

 the Codling Moth would fail to control N. nubilus, at least during the season of 

 1915, because it would be too early for this species. 



Nymphs. The nymphs, which appeared first on May 27th, at first grew 

 rather slowly but later seemed to grow more rapidly. By June 11th the largest 

 were about 3 mm. long, and by June 20th many were found 5 mm. long, exclusive 

 of antennae. About June 22nd the largest were slightly over one-quarter of an 

 inch in length and wing pads were then present on quite a number. The first 

 adult was seen on June 30th, Thus we suppose the nymph stag0 requires in the 

 neighborhood of a month in a cold season like that of 1915. In a warm season, 

 however, it is quite probable that less time would be required. 



Adults. From June 30th the adults increased in number until by July 15th 

 they outnumbered the nymphs present. Many of the females at this date were 

 distinctly swollen with eggs, which upon being examined seemed to be perfectly 

 formed and, though as mentioned above, no egg-laying was ever witnessed, there is 

 no doubt that oviposition began about the middle of July. It is perhaps worth 

 recording that we never saw any mating of the sexes. Males do not live so long as 

 females. Several of the latter which were in the adult stage when put in a cage 

 on July 9th were still alive on August 12th, having lived at least 33 days. From 

 July 15th for two weeks the number of adults seemed to be constant, then began 

 slowly to decrease till by August 24th very few were observed, and these had 

 disappeared entirely by September 7th. 



Description of Life Stages. 



Eggs. The egg is 1.5 mm. long by .3 mm. in average diameter, quite strongly 

 curved, slightly club-shaped, nearly colourless, with a glistening white cap. The 

 end which is thrust into the twig is slightly larger than the other, is rounded, and 

 circular in cross-section. Towards the other end the egg gradually flattens, is 

 oval in section and is surmounted by a definite, glistening, white, cylindrical 

 hollow cap, which makes up about one-sixth the total length of the egg (see fig.). 

 The cap appears as though it had been slipped on over the end and is deeply 

 notched on the flattened sides. The tips of the projections so formed, draw more 

 or less together after the eggs are laid, suggesting somewhat a minute lobster claw. 



Nymphs. The nymphs, when freshly hatched, are about 1.5 mm. long, almost 

 colorless, with large triangular head, large dull red eyes and with long stout 

 antennae and legs marked with faint reddish bands. They are quite sluggish and 

 were mistaken by one of Ontario's best apple growers for aphids. 



All the later stages of the nymphs have green bodies with dull reddish 

 mottlings upon the back and sides; the second abdominal segment has a small 



