PEMPHIGUS BUESARIUS. 117 



Pemphigus bursaeius, Hart. PL CXI, figs. 1— -7, and 



CXIII, figs. Q—S. 



Aphis hursaria, Linn., Fab., Scli., Kirby and Spence. 

 Eriosoma populi, Mosley. 

 ApJiioides bursaria, Rondani. 

 Pemphigus hur sarins, Kalt., Koch., Pass. 



Apterous viviparous female {Queen Aphis). 



Incla. Millimetres. 



Size of body O'llOx 0-080 279 X 2-02. 



Length of antenna 0-015 0-38. 



Large, oval, dusky green, body-rings well marked. 

 Head fuscous. Antenna very short. Legs dusky and 

 very short. All the somites are garnished with from 

 four to six white woolly patches. Tail none. Rostrum 

 very short. The antenna are only partially developed, 

 and are composed only of four joints. 



The generation which succeeds this is flatter and 

 smaller; smooth, darkish green, and furnished with 

 short cotton-like threads. The antennse, though some- 

 what more developed, still only show four articulations. 

 Eyes very small. 



Pupa. 



This has a longer form, and is of a pale greenish 

 hue. Head, wing-cases, and legs, somewhat smoky. 

 The sides of the abdomen and the last few rings have 

 white mealy patches. Towards the tail this farinaceous 

 matter appears in greatest abundance. The lateral 

 edges also have similarly disposed white spots, 



« Winged viviparous female. 



Inch. Millimetres. 



Expanse of wings 0-300 7-62. 



Size of body O'llO X 0'040 2-79 X I'Ol. 



Length of antennas 0*040 1-01. 



