302 



FOREST ENTOMOLOGY. 



It is very variable in colour and appearance. Hence Buckton re- 

 marks that " it is exceedingly difficult to reconcile the descriptions 

 of various insects named Aphis cratcegi by authors." 



The apterous viviparous 

 female is a bright - green- 

 coloured insect with brown 

 eyes. The antennae are 

 shorter than the body. The 

 third and seventh joints are 

 the longest. The cornicles 

 are comparatively long, cylin- 

 drical, and equally thick 

 throughout. The tail is 

 short but conspicuous. 



The pupa in many respects 

 resembles the apterous speci- 

 mens, but on the whole is 

 very much smaller in size. 



As I have not made any 

 descriptive notes on the 

 winged form (fig. 282) when 

 examining the living insect, and mounted specimens lose all colour, 

 I append Buckton's description : 



" Head, neck, ring, thorax, and its lobes black, head broad and 



convex, abdomen shining bright- 

 green, with the same marked carin- 

 ation and minute pore marks of 

 the larvse. Cornicles long and 

 straight, colour olive - green, an- 

 tennas and legs ochreous, pale, and 

 hairy. Rostrum reaches to the 

 second coxa. Tail conspicuous 

 and green. Eyes bright red." 



With regard to remedies for 

 this pest, we must either kill the 

 insect in the stages of its metamorphoses or destroy the eggs. The 

 insect form may be considerably checked by syringing the foliage 

 with a mixed solution of soft soap and quassia chips. On the other 

 hand, the eggs may be got rid of, so far as young hedges are concerned, 



Fig. 281. Eggs of Aphis crataegi on thorn in 

 nursery -line. 



Fig. 282. Aphis crataegi. (From Buckton's 

 'Monograph of British Aphides.' Ray 

 Society.) 



