Insects, etc., Injurious to Nuts. 317 



the leaves a sickly yellow when present, as it is in some seasons, in 

 very large numbers. Winged and wingless females are found to 

 produce living young, unlike the former species and are seen earlier 

 in the season. They feed near the mid rib, as does juglandis, but 

 always on the under surface. Their first appearance is about the 

 middle of May and they continue until October (1). The eggs are 

 laid on the bark and twigs of the walnut tree. I have observed it 

 on two or three occasions in a harmful state at Kingston, and once 

 at Taplow. 



Desceiptiox. 



The apterous female or larva is small, somewhat elongate, pale 

 bluish-yellow. Body, hairy ; hairs, capitate. Abdomen with two 

 longitudinal rows of brown spots on the dorsum. Eyes, red. 

 Eostrum, short. 



The pupa is larger than the female. Yellow, green, and 

 brown. Abdomen with four rows of black spots. Wing buds and 

 legs a peculiar kind of pale greenish-blue. 



The winged female is almost orange. Abdomen semi-transparent. 

 Thorax sometimes brownish-orange. Antennas, short; seventh seg- 

 ment, small; tips of segments, dusky. Legs, yellow. All the 

 nervures, stigma, and insertions of the wings are yellow. 



The oviparous female is apterous, hairy, yellowish-green, and 

 has three black bands on the abdomen. Antennfe ringed with black. 

 Legs, green, with isolated black spots on tips of femora. Appears in 

 August. The male is winged and is like the viviparous female, only 

 much smaller. 



This dolphin occasionally causes much loss to the walnuts by 

 drawing out quantities of sap from the leaves. In 1890, and again 

 in 1894, they were very abundant at Kingston-on-Thames, but 

 they do not seem to secrete much honeydew, and hence only do 

 damage by puncturing the tissues of the leafage. They are particu- 

 larly destructive when many appear early in the year when the 

 walnut leaves are still tender. Notes of its occurrence have been 

 sent me also from Great Staughton, from Worcester, and I have 

 observed it swarming on the leaves at Wye. The wash used for 

 juglandis is also of use for this louse. 



References. 



(1) Theobald, F. V. Notes upon Insect Pests in 1894, with especial reference 



to Insects attacking the Walnut, p. 17 (1905). 



(2) BucUon, G. B. ' Monograph of British Aphides,' vol. III., p. 32 (1880). 



