94 CHARACTERS OF THE GENERA OF APHIS AND COCCUS. 
short, and thread-shaped (filiform) ; wing-cases and wings 
of equal size ; body mealy; eyes two, each divided into 
two. 
Ex. A. Chelidonii, Latr. Reaumur s Genera Insectorum, 
pi. XXIII. f. 18. 
I am not aware of any English figure of this insect. One species 
( A. Proletella, Latr.) is said by Kirby and Spence ( Introduction to 
Entomology, vol. iii. p. 89,) to lay 200,000 eggs. The species are 
very minute, and many have probably escaped observation; five only 
having been named. 
VII. Fam. CocciDiE, Leach. 
Snout (rostrum) only in the female; wings in the male, 
but no wing-cases ; female wingless. 
1 Gen. Dorthesia, Bose, (scale bugs). 
The body of the animals of this genus is covered by a number 
of cottony or waxy laminae, which partly cover each other, and are 
arranged usually in a triple series. In character and habit allied 
to Coccus. ” 
Ex. D. Floccosa, De Geer. Memoires pour servir a VHistoire 
des Insectes; par Charles de Geer, vol. vii. p. 604, 
pi. XLIV. fig. 26. 
I know of no figure in any English work; six species only of this 
genus have been noticed in Britain. 
2. Gen. Coccus, Linne. (scale bugs). 
Snout (rostrum) bent under the breast; antenna thread¬ 
shaped (filiform) ; abdomen of the males with tw T o long 
bristles (setae) ; icings in the males two, erect; females 
without wings. 
Ex. C. Fragarge, Gmel. ? Phil. Trans., vol. cli. pi. X. 
Some interesting notices of several species of Coccus occur in 
Bingley’s Animal Biography (I2mo ed.), vol. iv. p. 78 et seq. 
Rennie also states some facts from Reaumur, Insect Transformations, 
p. 87, and has figured C. cacti at p. 89. 
Upwards of twenty species are natives of Britain, and doubtless 
many more would reward the assiduous collector. 
I cannot agree with you, at p. 57, that the colours of the different 
species of Aphis, are owing to the quality of their food. They are 
doubtless distinct species, and their food has nothing to do with 
their colour ; although age may, in a slight degree. In both animals 
and plants we find that individuals of very diversified colours affect an 
identity of pabulum. 
Yours &c., A 
February 1 6th, 1836. 
