XVI 11 



LIST OF ILLUSTRATIONS. 



Galls of Pontania salicis . 182 



Galls of Pontania bella . 1S2 



Galls of Pontania gatti- 



cola . . . .183 



Galls of Pontania ischno- 

 cents . . . . .184 



Leaf of goat willow eaten 

 by larvae of Pontania 

 scdicis . . . .184 



Larva? of Crcesus seplen- . 

 trionalis on alder . 185 



Crcesus septentrionalis : in- 

 sect and larvae . .186 



Foliage of larch injured 

 by larvae of Nematus 

 Erichsonii . . 1S7 



Nematus Erichsonii . . 1S7 

 . Larva? of Nematus Erich- 

 sonii . . . .188 



Pupal cases of Nematus 



Erichsonii . . . 18S 



Plank of silver fir injured 

 by Sii-ex gigas . . 189 



Sirex gigas (female) . 190 



Sirex gigas (male) . .190 



Spruce timber injured by 

 Sirex juvencus . . 191 



Sirex juvencus (female) . 191 



Sirex juvencus (male) . 191 



Injury done to ash stem 



by hornet . . .192 



Hornet ( Vespa Crabro) . 193 



Galls on under side of leaf 

 of dog-rose caused by 

 Rhodites eglanterice . 193 



"Moss or pin - cushion 

 gall,' - ' caused by Rhod- 

 ites rosce . . .193 



Seeds of Douglas fir in- 

 jured by Megastigmus 

 spermotrophus . .195 



Megast igmus spermotrophu s 

 (female) . . . 196 



Megastigmus spermotrophus 

 (male) . . . 197 



Seeds of silver fir injured 

 by Megastigmus strobi- 

 lobius . . . .199 



C0CCID.E (Scale-Insects). 



194. Ceratajihix lataniot (fringed 



aphis) on palm . . 203 



