64 BRITISH APHIDES. 



or bluisli brown. Under a, lens the skin is finely reti- 

 culated, and covered by a fine cottony pile. Antenua3 

 yellow, fine. Cornicles small. Cauda obtuse and 

 black. Legs wholly bright yellow. The young when 

 first born are white, with dark cornicles and red eyes. 

 Taken at Haslemere on the pear in August, when they 

 were injuring the trees greatly by the excretions made 

 by countless numbers. Later in the year certain speci- 

 mens were sent to me from Clifton infesting the dahha ; 

 these I consider to be the same Aphis, notwithstand- 

 ing the diff'erence of food-plant mentioned. 



Winged viviparous female. 



Inch. Millimetres. 



Expanse of wings 0*220 5*58. 



Size of body O'OGOx 0*025 1*52X0*55. 



Length of antennsB 0*060 1*52. 



cornicles 0*005 0*12. 



Variable in tint, the fresher specimens having yellow 

 abdomens with numerous brown bands and spots. 

 These bands increase with age and by widening out 

 finally obliterate all the ^^ellow. The adult winged 

 form is greenish black or sooty brown. Belly grey- 

 ish. Antennse, legs, tail, wing-insertions, and cubitus 

 ochreous yellow. Eyes red. The stigma and veins 

 brownish yellow. Rostrum reaches to the second 

 coxa3. The cornicles very short and yellowish brown. 



This insect, on account of the presence of small 

 frontal tubercles, might almost be grouped with Myzus ; 

 but from the form of the cornicles and the general 

 appearance of the body it better assimilates to Aphis. 

 If it really be A. ijyTarius of Passerini, this is its first 

 noted appearance in this country, and it then should go, 

 perhaps, into the genus he has placed it. 



Mr. Walker informed me that he had never seen a 

 pear-tree attacked by Aphides. Yet for two consecutive 

 years I found a tree so infested by this species that it 

 appeared as if it had been dusted with soot. The tree 



