30 



that direction, Prof. Forbes, of the State Normal Museum, writes that " no observations 

 had been made there regarding the migrating of this insect," and he Iciudly identified 

 the last-named species for me ; however both have been carefully looked up and identi- 

 fied as being separate, by other well informed Entomologists, all agreeing with me that 

 the above names are correct. 



Whether their migrating was instinctive, or forced by the Manitoba wave, then 

 reported in Chicago papers as having arrived in that direction, after a spell of very 

 warm weather ; or caused by the dry season, the ponds having become so exhausted 

 as to afford no pasturage for their larvae, seems a matter of conjecture : most likely the 

 latter, however, as the cold wave reached here but very slightly. 



BOOK NOTICES. 



The Hessian Fly, its ravages, habits, enemies and means of preventing its increase, by 

 A. S. Packard, jr., M.D.; being Bulletin No. 4 of the Department of the Interior, 

 U. S. Entomological Commission, 8vo., pp. 43, illustrated by two plates containing 

 many figures, one wood-cut and a map. 



A synopsis of all that has been published in reference to this destructive insect, 

 with such additional facts as the members of the Commission have been able to collect 



A Treatise on the Insects Injurious to Fruit and Fruit Trees in California. 

 By Matthew Cooke, Chief Executive Horticultural Officer ; 8vo., pp. 72. 



This useful pamphlet treats of the Codlin Moth, which has now taken up its per- 

 manent residence in California, making apple and pear growing in some sections very 

 uncertain ; the Pear Slug, the Red Spider, the Tent Caterpillar, Currant Borer, and 

 several species of Scale Insects which attack the apple, pear, peach, plum, orange, etc., 

 illustrated by a number of wood-cuts. It appears that our California friends are now 

 seriously affected by insect pests, from most of which they had until of late been free. 

 The fruit interests of this State are so highly important that very active measures are 

 being taken to keep these insect pests within bounds, and an Act has been passed by 

 the State compelling the general adoption of sucli remedial measures as shall from time 

 to time be found of value. We shall watch with interest the effect of such legislation, 

 and sincerely hope that it may result in a marked abatement of the evils complained of. 



Bulletin No. 7 Insects Injurious to Forest and Shade Trees. By A. S. Packard, 

 jr., M.D. Issued by the Daparhmont of the Interior, U. S. Entomological Com- 

 mission ; 8vo., pp. 275, with 100 illustrations. 



The object of this Bulletin, as stated in the introduction to it, is to give to the 

 public a brief summary of what is up to this time known of the habits and appear- 

 ance of such insects as are injurious to the more useful kinds of trees. Beginning 

 with the insects injurious to the various species of Oak, the author ti-eats of those 

 which injure the EUn, Hickory, Butternut, Chestnut, Locust, Maple, Poplar, Linden, 

 Birch, Beech, Tulip Tree, Horse Chestnut, Wild Cherry, Ash, Alder, Willow, Pine, 

 Spruce, Balsam, Juniper, Tamarack, Arbor Vitae, and others. A Inrge proportion of 

 the work is occupied with descriptions of those insects which injure the more important 

 forest trees such as the Pine and O.ik. This is a most useful synopsis of our knowledge 

 in this department, and its issue will no doubt greatly stimulate the progress of Ento- 

 mology in this practical direction, for while it shows that much has been done in some 

 of the most important departments, in many others our knowledge is extremely 

 scanty. This work is conveniently arranged, and like the other works of this distin- 



