THE CANADIAN ENTOMOLOGIST. 147 



BOOK NOTICE. 



Miscellaneous Entomological Papers. By F. M. Webster : 

 Feb., 1894. 



We have just received a neat pamphlet of 59 pages, which forms 

 Bulletin 51 of the Ohio Agricultural Experiment Station. It is by Prof. 

 F. M. Webster, and, like all his work, shows careful preparation. 



The insects treated of in the first part are : — The Asparagus Beetle, 

 the Western Corn Root-worm, the Broad-striped Flea-beetle, Blister 

 Beetles, the Basket Worm, the Cabbage Aphis and the Apple-leaf Louse. 



An interesting account of the insects which have been introduced 

 into the State is given under the head of " Some Insect Immigrants in 

 Ohio." There appear to have been two great highways which insects im- 

 ported from Europe have followed : those which have entered the State 

 at its north-eastern corner and spread westward, and those from Southern 

 Europe which have generally entered by the way of the Ohio Valley and 

 have a more or less restricted northern distribution. 



In the article " Insect Foes of American Cereals " the writer is evi- 

 dently dealing with a subject of which he has made a special study. By 

 patient observation and the application of practical common sense. Prof. 

 Webster has made some important discoveries in Economic Entomology. 

 Not the least of these is the fact recorded in this pamphlet that the 

 Apple Aphis passes part of the year as an injurious enemy on wheat. In 

 fact Mr. Webster says : " So far as my observations go, it is more detri- 

 mental to the wheat than to the apple." This is an important discovery, 

 and will doubtless draw the attention of entomologists to this important 

 subject of the " Alternation of Generations " among the Aphides — a line 

 of investigation which has engaged much of the time of Messrs. Riley and 

 Howard at Washington. Speaking of remedies. Prof. Webster says : 

 " It would appear almost visionary to advocate spraying apple orchards 

 with kerosene emulsion in mid-winter to protect the wheat crop, but 

 nevertheless one of the most serious enemies of young fall wheat passes 

 its egg stage on the twigs of the apple during the winter season. I refer 

 to the Apple-leaf Louse, Aphis ?nali, Fab." 



" Soon after the young wheat plants appear in the fall the winged 

 viviparous females of this species flock to the fields, and on these give 

 birth to their young, which at once make their way to the roots, where 

 they continue reproduction, sapping the life from the young plants — 



