92 



The paper comprises more or less complete notes ou the habits and 

 careful descriptions of various stages of the Cherry Plant-louse [Myzus 

 cerasi L.), Willow Grove Plant-louse {Melano.ranthus salicti Harr.), 

 Spotted Willow Plant-louse {Melanoxanthns salicis L.), White Pine 

 Plant-louse {Lachnus strohus Fitch), Toothed Willow Plant louse {Lack- 

 nus dentatus LeB.), and the Scotch Pine Plant-louse {Laclmus pini L.). 



Four plates of drawings by Miss Freda Detmers, Mr. Weed's assist- 

 ant, accompany the article and illustrate several of the stages of the 

 plant-lice discussed. All publication ou Aphidids that does not em- 

 brace the full annual life-cycle must needs be preliminary ; but such 

 studies as the above are most useful as helping to final results. 



The Boll Worm Investigation.— By resolution of Congress the Division 

 has been instructed to conduct an investigation upon the Cotton Boll- 

 worm {Heliothis armigera) supplementary to that which was summar- 

 ized in the Fourth Report of the U. S. Entomological Commission. 

 Active measures have been taken to make a success of the investiga- 

 tion and trained agents have been stationed at Holly Springs, Miss., 

 College Station, Tex., Pine Bluff, Ark., and Shreveport, La., and are 

 carrying on a course of observations and experiments. 



Diseases of Crops and their Remedies.*— Dr. O. B. GrifiQths has recently 

 favored us with a copy of his little book with the foregoing title, which 

 forms one of the Bell's (London) Agricultural Series, and is designed, 

 as stated on the title page, as a hand book of economic biology for 

 farmers and students. It gives briefly the life-histories of the principal 

 insect and vegetable foes of the farm together with means to prevent 

 or reduce the losses arising therefrom, and will doubtless beof service to 

 the English farmers. The subject matter of the book has been compiled 

 from various sources including, on insects, the publications of the U. 

 S. Entomologist. The illustrations are copious and apparently new, but 

 of very inferior character. 



SOME NEW ICERYAS. 



It is a peculiar and interesting fact that while, since 1878, the genus 

 Icerya has been known only by its two species I. seychellarmn (Westw.) 

 {=sacchari Sign.) and I. purchasi Mask., the present season should 

 have brought to light no less than four additional species. The enor- 

 mous damage done by I. purchasi in South Africa, New Zealand, and 

 particularly in California, bids fair to be duplicated by that which 

 has been and may be done by the new /. cegyptiacum (Doug.) in Egypt, 

 while the probabilities are that much damage may be expected from 



» Loudon : George Bell & Sons, 1890, 2s. Gd. 



