PEMPHIGUS PALLIDUS. 127 



Pemphigus pallidus, Haliday. Plate CXIII, figs. 1 — 5. 



Eriosoma imllida, Haliday : Curtis.* 

 Pemjpliigus albusj Liclit. 

 „ tilini, Liclit. ? 



Apterous viviparous female. Queen Aphis. 



Inch. Millimetres. 



Size of body O-llOXO-070 2-79xl-77. 



Length of antennge 0'025 0*62. 



Large, oval, white or pale yellow, which by age turns 

 browner. Antennae five-jointed. Eyes very small, 

 almost obsolete. Legs and antennae rather fuscous. 

 Hind legs much longer than the other four. The 

 members of the first brood are much smaller than the 

 insects which issue from the Qgg ; they are of a ferru- 

 ginous pale yellow. 



Pupa. 



Long-oval, yellow, with pale wing-covers. Eyes 

 red. Abdomen greyish. 



Incli. 



Size 0-070 X 0-035. 

 Winged viviparoufi female. 



Inch. Millimetres. 



Expanse of wings 0-220 5-58. 



Size of body O'OSO X 0-035 2-02 X 0-88. 



Length of antennae 0*020 0'50. 



Variable in size. Head and thorax bluish-black. 

 Abdomen oval, yellowish, with fine lateral dots. Eyes 

 red. Legs and antennae fuscous. Wings moderately 

 long. Veining fine and pale brown. Stigma greenish. 

 The hind wings, like other Pemphigince, have two 

 oblique veins. Notwithstanding the similar woody 

 character of the two galls, both of which are formed 

 without foot-stalks on the midrib of the leaf of the 

 elm, the above-described insect probably is not that 

 called by Ratzeburg Tetraneura alba, which seems also 



* Curtis, App. 279. 



