140 BRITISH APHIDES. 



tubercles. Thorax with two lateral corrugations, 

 tufted with hair. Abdomen flattish, with a marked 

 carination, and provided with four longitudinal rows 

 of dark shining tubercles. Cornicles just appearing 

 above the surfaces of the back. Cauda small, rounded, 

 dark green, and pilose. Legs and antennas pale. First 

 and two last joints of the latter dark. Rostrum reaches 

 to the second coxae. 



Feeding on the birch, Walthamstow. 



Apterous oviparous female from the same tree and place. 



Inch. Millimetres, 



Size 0-090 X 0-045 2-27x1-13. 



Oval, broad across the abdomen, tubercular, and 

 tufted with ochreous bristles. Colour ochreous yellow. 

 Head dark brown. A square spot on the thorax, and 

 eight or more interrupted brown stripes across the 

 abdomen. Legs dark brown, hind tibiae dilated. 

 Antennae yellow, with the first and the last joints dark 

 brown. 



Though Koch found his Gli. granulatus feeding on 

 Acer campestre, it is possible that the insects above 

 described may be of the same species. 



Captured with the male at Walthamstow, in October. 

 This insect contained seven large eggs. 



Chaitophoeus populi, Linn. Plate LXXXII, 

 figs. 3—5. 



Aphis populi, Linn., Fab., De Geer (?), Kalt., Ratz. 



Walk. 

 Myzcegirus Amyot. 

 Arctaphis populi, Walk. 

 Chaitophorus populi, Pass. 



