O BRITISH APHIDES. 



Thelaxes dryophila, West. Plate CXV, figs. 1 — 7. 



Vacuna dryophila, Heyd., Kalt., Koch, Pass., Licht. 



Aphis dryophila, Ratz., Schr. 



Vacuda, Amyot. 



Cinara quercus, Sir 0. Moseley. 



Apterous viviparous female. 

 Queen Aphis. 



Inch. Millimetres. 



Size of body O'OOO X 0'055 2-28 X 1*39 



Length of antennae 0*035 0*88 



Cornicles 0*005 0*12 



Oval, flat ; olive-brown, greenish, or chestnut-brown. 

 Rings of the body well marked ; a pale yellowish streak, 

 commencing at the head with diminishing distinctness, 

 passes down the dorsum to the apex ; five dark pore- 

 marks, each surrounded by a pale ring, occur on both 

 sides. Nectaries wart-like, pale, and inconspicuous. 

 Legs and antennaB brown. Eyes very small, and 

 divested of the usual tubercle ; the optical facets, 

 which number only five or six, are set far back on the 

 head. AntennaB about one- third the length of the 

 body ; five-jointed, the third joint much the largest. 

 Body slightly pilose. Rostrum rather short, but this 

 organ is longer in the }^ounger forms. 



The queen Aphis or fundatrix is, as usual, much 

 larger than her offspring. 



I'h pa. 



Inch. Millimetre. 



Size 0-060x0-030 1-52x0-76 



Small, green or yellowish, with a pinkish hue to- 

 wards the head ; slightly mealy, with two pale streaks 



