1916 



ENTOMOLOGICAL SOCIETY. 



and Ontario. In Ontario E. P. Van Duzee reported it as '• common and highly 

 colored^' in Muskoka during July and August, 1888; he also saw a specimen that 

 had been captured at Temagami in 190'8. It has also been observed by Prof. 

 Caesar, Mr. G. J. Spencer or the writer in the following additional places in 

 Ontario : Woodburn, Hamilton, Fonthill, St. Catharines, M'ilton Grove (Middlesex 

 County), and in Norfolk County at Simcoe, Walsh and Tyrill. 



Life History, 



Eggs. Although we could never find a female ovipositing either in cages or 

 in the orchard there seems no doubt that egg-laying extends over a long period, 

 which this year would be from about July 15th to September 1st, most of it being 

 over by August 15th, from which time the adults gradually decreased in number, 

 completely disappearing by September 7th. The majority of the eggs are laid 

 singly, but not infrequently two are found so very close together as to suggest that 

 they might have been laid at the same time. They are invariably found behind 



Adult Xetirocolpus nuMlus and nymph. (Enlarged.) 

 clavate hairs on antennae of nymph. 



Note the 



the buds Avhich are situated in the axils of the leaves on the new growth. In 

 addition to the Apple, eggs were found also on Sumachs. They were inserted into 

 the tissues of the new growth. We suspect they are also laid in Elder though we 

 are not sure. No eggs could be discovered on any kind of weed in the orchard. 

 On apple trees they are so deeply pushed under the bud into the tissue that even 

 the white tips are hidden from view. If the bud is removed the egg will be seen to 

 be sticking out of the spongy tissue for from one-quarter in extreme cases to one- 

 half its length, the average being about one-third of the length (see fig.). There 

 is absolutely no external evidence of the presence of the egg when the bud and leaf 

 are on the twig. 



This year the eggs began to hatch on May 2Tth; the maximum hatching taking 

 place between June 5th and June 9th. Freshly hatched nymphs, however, con- 

 tinued to be found up to July 13th. 



In this connection it will be interesting to note the relationship existing 

 between the maximum hatching of the various kinds of apple-attacking Capsids 

 and the stages of the apple trees in each case. Thus this season at least (1915) 

 the majority of the eggs of N. nuhilus in Ontario hatched from just after the 



