147 



\ / 



( la 



(Fir,. 47.) 



(«l adult: iV) same, side view; (ci larva: ((/) cocoon: li') in.iuivd apple. All slightly 



onlai-ged, except c, which is reduced. Uc-drawn from Masumiira.) 



it i.': probable that the larvte issued from the fruit on tlie journey ; so that it 

 appears to us that this insect is one which is partieularl.v liable to be intro- 

 duced. It has since been learned that this insect has alread.v probabl.v gained 

 a foothold in British Columbia. (Not in British Coluuibia. — .T. R. A.) 

 " Pe.!Vr Fruit-Borer (yriiliniitcriix riihri.:(iiiclUi, H.\(i.). 

 " Is the larger of two species of similar habits found in Japan. Professor 

 JIatsumura states that pear-growers lose every year from 30 to "0 per cent, 

 of their crops from this insect which is more troublesome than the apple fruit- 

 borer. The eggs are laid under a small twig, in clusters of twenty, protected 

 by a white silken web. They hatch early in .June, at the time when the fruit 

 has reached the size of a cherry. The young larva' si)in a considerable amount 

 of silken thread on the twigs and make their way to different fruits near by, 

 which they jumcture to the core, always leaving a blackisli ojieniug at their 

 entrance. Their presence is readily detected by these holes. The larval stage 

 lasts three weeks or more, and the pupal change is under.gone within thin 

 silken cocoons inside the fruit. The insect hibernates in the egg stage." 

 On the matter being referred to Dr. Fletcher, he wrote as follows : — 

 " I have your letter of the ilth January, and am much interested in the 

 matter of the apples wliirh were condemned. If the insect was the apple 

 fruit-miner, ArgyrcsthUt eoiijiiiicUii (which i)robabl.y is what Mr. Jeffre.v means 

 by the Japanese Fruit-Borer, Larvrna hercllcra) I think the Californian people 

 were quite wise to condemn the shipment. You will find this insect treated of 

 at some length in my annual report for 1S08, at page lOS : :ilso in Bulletin 

 No. 10, new series, U. S. I)e]iartment of Agriculture. Bureau of Kntomology, 



