24 BEITISH APHIDES, 



Vacima. Professor Huxley has kindly compared two 

 of his own pencil sketches with drawings I have made of 

 these two genera, and with the sincerity of a truth- 

 seeker he writes that " The former appear to me to 

 agree with your CalUpterus quercus more nearly than 

 with any other species among those you have figured." 

 I may say also that these sketches were kindly for- 

 warded to me, and that to my mind they had all the 

 peculiarities attaching to CalUpterus. 



A settlement of this question is of the more import- 

 ance, since the genus Facuiia^ must be considered 

 somewhat removed from the typical Aphis, and we 

 might therefore, perhaps, expect a somewhat varied 

 parallelism between the morphology of the perfect and 

 imperfect sexes of the genera Siplionoplioray Galli- 

 pteruSi and Vaoufia.i 



Oallipterus QUERCEUS, Kalt., Plate XOI, figs. 1 — 4. 



Aphis querceaf Kalt., Ratz., "Walk. (?). 

 Myzocallis queyxea, Pass. 



Apterous viviparous female. 



Incli. Millimetres. 



Size of body 0-070xO-035 1-77X0-88. 



Length of antennas 0*060 1'52. 



„ cornicles very small. 



Smaller than C. quercus. Variable as to its mark- 

 ings. General colour darkish green mottled with 

 brighter green. Cornicles tipped with black, about 

 the length of the body, and tinged with black. Eyes 

 usually spotted with red. 



* The genus Thelaxes of Westwood lias prioi'ity over Vacuna of 

 Heyden, but I have retained the latter name here as it appears in 

 Professor Huxley's papers. 



t Huxley "On the Morphology of Aphis," 'Trans, Linn. f5oc.,\vol. 

 xxii, part 3. 



