86 BEITISH APHIDES. 



mucli later period. Here, very curiously, the Aphis 

 passes into its winged, condition before its death is 

 effected, the parts consumed apparently being such as 

 are not immediately concerned in the external meta- 

 morphosis of the Aphis. 



Not unfrequently the empty skin of the winged 

 Aphis may be seen mounted on the summit of one of 

 these parasitic cocoons. 



All the species of Coryna do not make constructions 

 similar to the above. In the middle of July I bred 

 several specimens of a closely allied species from the 

 indurated pupse of Siphonophora rosoe. They emerged 

 from holes pierced in the backs of the Aphides. 

 These insects had orange legs. Mr. Walker referred 

 them to the genus Coryna, but, as Goruna clavata (sic) 

 of Curtis has twelve antennal joints in the female and 

 thirteen joints in the male, in this respect they differ 

 from my insect, and thus I conclude they cannot be 

 specifically identical. Provisionally I will name the 

 former parasite Coryna duhia,* Buckton. 



The cocoons of both these parasites are figured on 

 Plate LXIV. 



Aphis laburni, Kalt., Koch, Pass. Plate LXV, figs. 



1—3. 



Apterous viviparous female. 



Inch. Millimetres. 



Size of body 0-080x0-045 2-02xl-13. 



Length of antennae 0*050 1*27. 



cornicles 0-015 O'SS. 



Wholly black with the exception of the third, fourth, 

 and fifth antennal joints, and the upper halves of the 

 femora and tibise, all of which are yellowish. Cauda 



* Body briglit brassy green. Antennae pilose, witb ten joints, in- 

 cluding tlie minute basal joint ; second joint longest. Eyes dark 

 brown. Palpii nconspicuous. Legs greenish, with a single spur on each 

 tibia. Wings pilose, iridescent, with a single costal cell. Cubital vein 

 dilated into a button, as in C. clavata. 



