122 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



of our commoner species, and they undoubtedly condemn the 

 too prevalent system of clear cutting, which leaves the clearing 

 littered with branchwood and stumps. Unfortunately for the 

 private owner, it is almost impossible to clear land of worthless 

 branchwood and stumps, which are costly and difficult to 

 remove. All the more then is it important to realise that the 

 felled area is a source of evil which, if extensive and scientific 

 forestry is ever to be a success, must be removed. Meantime 

 there is much room for workers in forest entomology, especially for 

 those who can make observations in their daily work. At present 

 our knowledge of the distribution of our chief forest pests, and 

 of the actual financial loss caused by them, is very vague, and 

 all observations relating to these will be of great value. 



Explanation of Plates. 

 Plate I. 



Fig. la. Antenna oi Hylastes afer, showing seven-jointed whip. 



Hylastes palliattis, showing pear-shaped pro-thorax. x 6. 



Hylastes ater, showing long, narrow pro-thorax. x 6. 



Antenna ol Myelophilus piniperda, showing six -jointed whip. 



Myelophilus piniperda. x 6. 



Underside of pro-thorax (pro-sternum) of T. acunmiatits, showing 



intercoxal process. 

 T. acuniinatus (male), x 6. 



Underside of pro-thorax, showing absence of intercoxal process. 

 P. bidentattis (male). x I2. 

 Antenna of P. bidentatits, showing five-jointed whip. 



Plate II. 



Snout of Hylobius, showing antennse inserted near apex. 

 Fore leg of Hylobius, showing toothed femur. 

 Snout of Pissodes, showing antennoe inserted at middle. 

 Fore leg of Pissodes, showing absence of tooth on femur. 

 Mother gallery of Myelophilus piniperda. 

 Mother gallery of Hylastes palliatus. 



Mother galleries and breeding chamber of Pityogenes bidentatus. 

 Mother and larval galleries of Trypodendron lineaium shown in 

 transverse and vertical section. 



