12 ENTOMOLOGICAL NEWS. [January. 



fact that, according to Mr. Slingerland, the egg is quite hard and may be 

 roughly handled without injuring it. I have found the kerosene emulsion 

 entirely ineffective on the hard eggs of ^[elittia ccto and Anasa tristis, 

 but quite completely effective on the soft eggs of certain Tortricid moths 

 and of certain Coccida;. Chitine of any thickness resists perfectly the 

 action of most penetrants, including alcohol and chloroform, yields but 

 slowly to potash, carbolic acid or acetic acid, but is readily attacked by a 

 saturated solution of bichloride of lime, or by eau Jaralle and can La- 

 ban-ague. In such strength as we may apply them on vegetation, I be- 

 lieve that none of the materials named will injure a hard shelled egg, 

 simply because they could not penetrate it. This will explain, also, why, 

 on certain bugs like Anasa tristis or beetles like Macrodactylus subspino- 

 sus, the diluted kerosene is ineffective, and even the pure article is resisted 

 quite strongly. On such insects the spiracles offer the only part of entry 

 for the insecticide, and these are exceedingly well protected in the cases 

 mentioned. The softer the egg or the insect, and the less protected the 

 spiracles the more effective becomes the kerosene emulsion. 



Notes and. Ne^vvs. 



ENTOMOLOGICAL GLEANINGS FROM ALL QUARTERS 

 OF THE GLOBE. 



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Ix recent years the bark-beetle, Dendroctonnsfrontalis Zimm. has ap- 

 peared in the \Yest Virginian forests with very disastrous results. To 

 combat it in some measure, Mr. Andrew D. Hopkins, entomologist of 

 the Agricultural Experiment Station at Morgantown, \Y. Ya., has formed 

 the plan of introducing against it a new enemy in the European bark- 

 beetle, Clerusforinicarins L. For this purpose Mr. Hopkins has lately 

 been in Germany, and has here applied himself with great skill and good 

 fortune to the collection of this useful insect, and to the study of its con- 

 ditions of life. He has taken to America the larva? of the bark-beetle 

 destroyer in various stages, as well as the pupa and imago, all in their 

 Winter rest, and the hope is entertained that if they arrive there in healthy 

 condition, the attempt at acclimation can begin next Spring. CAMILLO 

 F. SCHAVFUSS, Mus. Dir. Meissen, Saxony. 



