275 



The apples from two trees that were not treated were counted and 

 examined with the following results : 



One produced 84:6 apples, 297 of which, or 35.1 per cent, were wormy, 

 and the other produced 751 apples, 278 of which, or 37 per cent, were 

 wormy. 



Summarizing the results of the experiment, we find that the foliage 

 of the trees w^as entirely uninjured by any of the treatments ; that in 

 nine comparisons of the treatments of London purple and Paris green 

 seven resulted in favor of using Paris green. The two treatments gave 

 in one instance only one-tenth of 1 per cent and in the other six-tenths 

 of 1 per cent in favor of London purple ; that in every instance except 

 one the use of insecticides at the rate of 1 pound to 200 gallons of water 

 gave the best results. 



That 7.6 per cent of the fruit from all trees sprayed with London 

 purple was infested with the codliug larva, and only 4.4 per cent from 

 those sprayed with Paris green; a dift'erence of 3.2 per cent in favor of 

 the latter. 



I deem it unnecessary to enlarge upon the utility of the treatments, 

 as it is generally conceded that the ravages of the codling larva can be 

 prevented. Heretofore I have been prejudiced iu favor of London 

 purple, but this experiment proves conclusively that Paris green is the 

 more effectual. 



The next paper was by Mr. 0. M. Weed : 



LIFE HISTORY OF PIMPLA INaUISITOR. 



By C. M. Weed. 

 [Author's abstract,] 



The author reported rearing this species from larvae externally para- 

 sitic on an unknown Lepidopterous larva living within the stems of 

 Evening Primrose {(Enothera biennis). Figures of all stages of the par- 

 asite were shown. ♦ The eggs had been found several times attached 

 to dead lepidopterous larvae, suggesting the surmise that these larviie 

 were stung by the adult Pimpla before oviposition. 



In the discussion of this paper Mr. F. L. Harvey inquired if Pimpla 

 species oviposit in larvae already dead. Mr. Weed said that it was pos- 

 sible that they did, but he did not know. 



Mr. Howard asked how many eggs Mr. Weed found on a single larva, 

 to which Mr. Weed replied that he usually found but one, but occa- 

 sionally two. 



* Dr. Weed has submitted a specimen of this larva, which proves to be Laverna 

 eloisella Clem, the only Lepidopteron which we know to breed in the stems of (Enothera, 

 the and which we reared many years ago at St. Louis. Of the other species of 

 same geuus affecting (Enothera and which Miss Murtfedt has reared for us. L. murt- 

 feldtiella Ch. feeds in the flower buds; and L. brevivitella Clem and i. circumscri])- 

 tiella Zeller, in the si;ed capsules.-— C. V. R. 



