87 



41-45. Dilophus vulgaris (hop-cone fly) : perfect insects, with 

 drawings of insects and of larva ; piece of an affected plant. 

 The larvae attack the roots, the flies the cones. 



46, 47. Agriotes lineatus : perfect insect and larvae ; also 

 larvse of other species. [See also Insects injurious to Potato, 

 No. 41.] 



48. Julus, sp. This and the two following millipedes gnaw 

 the tender roots. 



49. Polydesmus complanatus. 



50. Julus pulchellus : drawing, natural size and enlarged. 



E. 140. 1886. 



281. "Water-colour sketches showing the injury done 

 to Scotch fir and spruce fir by various parasites. 



1. Scotch fir destroyed by Hylesinus piniperda. 



2. Spruce fir injured by Sesia cephiformis. 



3. Scotch fir injured by Tortrix buoliana. 



4. Scotch fir destroyed by Noctua piniperda. 



282. Water-colour sketches showing . the injury to 

 Scotch fir and larch by various parasites. 



1. Scotch fir injured by Hylesinus piniperda. 



2. Larch injured by Coleophora laricella. 



3. Scotch fir injured by Geometra piniaria. 

 '4. Scotch fir injured by a small Tenthredo. 



283. Diagrams (six) showing enlarged representa- 

 tions of insects injurious to farm crops. 



Prepared by Miss E. A. Ormerod for the Royal Agricul- 

 tural Society. 



1884. 



C. MODELS. 



284. Model of a " bordered pit " from the wood of 

 a conifer ; highly magnified. 



E. 150. 1888. Made by F. S. Leach. 



The upper half of the model can be lifted out to show the 

 closing membrane of the pit. 



285. Model of the apex of the thallus of Metzgeria 

 furcata to show the arrangement and mode of division of 

 the cells in a growing point with a bilateral apical cell. 



E. 160. 1888. Made by F. S. Leach. 



Black indicates the principal walls of the segments. 

 Red the first division in each segment. 



Green the second division in each segment. 



