1 68 Scxo/id Report on EcoNonu'c Zoology. 



This forest pest often attacks large areas at the same time ; in one 

 instance 2,000 acres were invaded. They often disappear suddenly ; 

 this is due to their being so susceptible to climatic changes, cold and 

 wet weather being very prejudicial to tliem. 



Several other Sawflies attack the conifers in this country, but tlie 

 only one recorded as doing damage is the Fox-coloured 8awlly 

 {Loph)/ni>i nifnx), Avhich did coiisideral)le harm in Argylesliire to 

 Scotch pines in 1890. It prefers young to old plants, trees from ten 

 lo fifteen or twenty years old being most sought after. Miss Ormerod 



found in the Argyleshire outlireak 

 that plants two to six feet liigli 

 were most subject to attack. 



The adult female (Fig. 2ii, a) is 

 reddish-brown, with black spots on 

 the thorax and with yellow to 

 reddish-brown legs. They occur in 

 August and September. One brood 

 only appears to exist and occurs in 

 larval form from the end of ]May 

 until the middle or end of June. 

 The larva' (Fig. 2o, a) are dusky 

 greenish-grey with black heads, a 

 pale line along the back and a dusky 

 line with a pale one on each side of 

 it above and below ; the spiracles 

 are placed in the lower pale line. 

 The sucker feet and venter are pale 

 green. When full grown they reach 

 rather more than half an inch in 

 length, and then form an oval 

 pale yeUowish-brown parchment- 

 like coc(5on botli amongst the needles 

 and amongst heather and in the 

 They are also social, two usually 

 pupate in June, those kept under 

 observation going into this stage the third week in June. Although 

 needles and other " cover " lay on the ground in the breeding-cage in 

 which I kept specimens they pupated in the earth just as described 

 by KoUar. The females which come from these cocoons lay their 

 eggs in August and Septendjer in the needles just as is done by 

 L. pini. Apparently the eggs remain in the needles rdl rlio winter 

 und hatch out in earlv May. 



Fig. 20. — TWO pine sawflik: 



a, Liqihurns nifnif; b, l..puii.\ 



t'artli, etc., 

 feedin-j,- on 



beneath the trees. 

 each needle. They 



