OcroBER 30, 1889. 



Garden and Forest. 



521 



inch, and tliose of the latter a little less than one-half of an inch. 



In a revision of the saw-tiies {Trans. Am. Ent. Soc, vol. i., 

 p. 236), published in 1867-68, the habitats given are Connec- 

 ticut, New York, Virginia and Illinois, showing that its known 

 range at that time was widely extended. 



The best, cleanest and most effective remedy we have tried 

 is the powdered white hellebore. An application of this 

 powder upon the foliage of infested plants soon caused the 

 ground beneath to become covered with dead and dying 



that the family to which it 

 Much good service seemed 

 l)ugs belonging to the family 

 and destroyed many larvae, 

 stages, i)y perforating them vv 

 ing the juicy contents of th 

 Uhler, and a closely related u 

 cially noticeable, and Negara 

 but was less common. 



belonged was not ascertained. 



to be done by several species of 

 of PentatomoidcE, which attacked 



in the imperfect and mature 

 ith their slender beaks and suck- 

 eir bodies. Euschistus fissilis, 

 ndetermined species, were espe- 

 hilaris, Sav, liad the same habit, 



Fig. 138. — A Cornel Saw-fly — ( Harpiphorus variatiiis. ) — See pnge 520. 

 Larva; before and after last moult. Larvfe hibernating in decaying wood. Female Saw-lly, enlarged. 



larvse. Kerosene emulsion would, undoubtedly, also be 

 effective, as well as Paris green and London purple. But 

 careful experiments shoidd be made with the arsenical 

 remedies, to determine the dilution necessary to prevent 

 injury to the foliage. Where there are but a few plants, 

 the egg-bearing leaves, or the leaves upon which the young 

 are clustered, might be picked off and destroyed. Among 

 the natural enemies of the insect is a very minute fly, 

 which was observed apparently in the act of ovipositing 

 upon its eggs. Unfortunately, the specimen was lost, so 



Two of the most beautiful of the species of Cornus — Conius 

 florida and C. Mas — have thus far escaped injury by these 

 larvas. C. alternifolia also lias been imtouched. But the 

 foliage of Cornus sericea, C. alba, C. stolonifera, C. paniculaia, 

 C. sanguinea, C. asperifolia and one or two others has been 

 greedily devoured. In this region groups of tiiese plants 

 often appear as if they had been visited by fire. The accom- 

 panying figure of Harpiphorus varianus is from a drawing 

 made by Mr. C. E. Faxon. J. G. Jack. ' 



Arnold Arboretum. 



