APHIS LYCHNIDIS. 73 



taries black. Upper parts of femora and tibife 

 ochreous. Wings with greenish cubitus and inser- 

 tions, and brown veins. Eostrum yellow, with a black 

 tip. 



Pupa. 



Wholly black, except a few grey patches, ochreous 

 legs, and brownish wing-cases. 



Bonnet first discovered in this insect the partho- 

 genetic mode of increase, and noticed that the mature 

 winged condition is not attained until a fourfold 

 moult or change of skin is effected. 



Authors have noticed the similarity of this insect to 

 A. vihurni. I believe them to be distinct. The 

 apterous forms may be distinguished by the white dots 

 or pore-marks. When mounted in balsam the insect 

 stains it of a fine reddish brown, which I have not 

 observed A. viburni to do. The winged form is by no 

 means so plentiful as the apterous. It occurs at the 

 end of August. 



Aphis lychnidis, Linn. Plate LIX, figs. 2, 3. 

 Linn., Bonnet, Kalt., Walk., Koch. 



, Apterous viviparous female. 



Inch. Millimetres. 



Size of body 0-060X0-035 l-54x0-88. 



Length of antennae 0*040 I'Ol. 



cornicles 0-007 0-17. 



Globose or semi-globose. Pitchy black, very 

 shining, as if covered with a varnish, " glutinous in 

 appearance " (Walker) . Head broad. Eyes brownish. 

 Cornicles rather short and black. Cauda incon- 

 spicuous, black. Third joint of antennse and all parts 

 of the legs, except the tarsi, dark ginger -brown. 



The whole Aphis is more or less hirsute. The very 

 young insects are dark olive-green. 



