TABLE OF CONTENTS. XVU 



PAGE 



Family II.— Ukocebidae (\V^ood-wasps). 



1. Sirex juvencux (Steel-blue wood- wasp) 355 



2. S. glfjax (Yellow wood-wasp) ... . 357 



Family III.— Cyxii'idae (Gall-wasps) 358 



(Z?.) Diptera. 



Family I. — Gkcidomyiidae (Gall-gnats). 



1. Cri'Hhiinijla mViciperda (WiWow <j:,-A\\-gni\V) 360 



{('.) Hemiptera. 



Family I. — Aphididae (Plant-lice). 



1. f/wnwes- rt7(/c/;.'( (Spmce-gall Aphis) 361 



2. C. cocclneux 364 



3. C. .ifi-ohilobiux (Larch Aphis) 36-t 



4. C. sihiricu.'i 365 



Family II. — Coccidae (Scale-insects). 



1. Coccus fugl 366 



1, Lecanium hemicrijphum 367 



(Z*.) Orthoptera. 

 Family I.— Gryllidae (Crickets). 



1. Grijllotalim vulgaris (Mole-criciiet) 368 



Family II.— Aceidiidae (Locusts). 



1. Pachi/fgh/n migratoriiis {Migratorj locust) 372 



List of Trees with the Insects which attack them . 373 



PAKT III. 

 PROTECTION AGAINST PLANTS. 



CHAPTER I. 

 PROTECTION AGAINST FOREST WEEDS. . 



Section I. — General Account. 



1 . Definition .... 386 



2. Classification 386 



3. Utility of certain weeds 390 



4. Damage done by forest weeds .... . . 390 



5. Preventive measures 395 



G. Remedial measures 397 



F.p. h 



