CALLIPTERUS QUEROUS. 21 



head, thorax, and abdomen banded and spotted with 

 rich brown. The antennse are longer, and the stigmata 

 are more of a grey shade than with the females. 



This species furnishes one more example of the 

 dimoTjpliism of the males, and points out the plasticity 

 of this insect family under the varying action of local 

 surroundings. 



At present we are ignorant whether or no there be 

 any modification of form in the insects hatched from 

 the broods of these different paternities. If there 

 should be any difference, the circumstance would have 

 considerable interest with the morphologist. 



Calliptekus quercus, Kalt.i Plate XC. 



Aphis quercus, Kalt., Walk., Ratz. 



GaUlpterus quercus, Koch. 

 Myzocallis quercus, Pass. 



Apterous oviparous female. 



Inch. Millimetres. 



Size of body 0*080 X 0'040 2-02 X I'Ol. 



Length of antennae 0*060 1'52. 



„ cornicles very small. „ 



Flat, oval, pale green or yellow, some examples are 

 almost colourless ; front bristly. Antennae not so long 

 as the body ; pale, ringed with brown. Eyes brown 

 or reddish. Abdomen with two rows of brownish trans- 

 verse dashes, and six or more tubercles with capitate 

 bristles on each lateral edge. Cornicles green and very 

 short. 



Pupa. 



Paler than the larva. Wing-cases and legs pale 

 yellow-green. More hirsute than the last-described 

 form. 



