1918. | x BASHAMBAR Das: The Aphididae of Lahore. 219 
Aphis durranti can be distinguished with comparative ease from other malviform 
Aphids, but the differences seen with the naked eye are small, and the size and colour 
being variable, one cannot readily make it out from A. malvordes, sp nov. or even 
À. malvae (Koch) when the two are feeding together. 
As it seems to be an unnamed species, it has been called after its chief host, Dur- 
ranta. 
The time of appearance is late in September or October, and it continues on till 
January or February. 
Late in December some females were observed to be banded with a white powdery 
substance of the same nature as that forming the tassels of the pupae. These white 
bands have been noticed in the case of other species of Aphis as well, but little 
explanation has been offered in regard to them. 
No sexuales were secured, though it is probable that they do form at this season, 
and in all likelihood the progeny of the white banded females may later be found to 
have some connection with their production. 
Winged males in species of this genus are not very different from alate females, 
and only a careful examination of the genitalia and antennae reveal the differences. 
The same is true of the apterous oviparous females whose hind legs are not so much 
swollen as in the other genera; they develop only a few secondary sensoria which 
ordinarily would escape observation. This perhaps accounts for the scarcity of true 
sexes so far obtained in this genus. 
The chief parasite of this species is a Lysiphlebus ; it is sometimes so extraordi- 
narily numerous that about midday one can catch hundreds of them by hand. 
Aphis gossypii (Glover). 
Synonym.—(I) A. citruli (Ashmead), 1882. ‘ 
i (2) A. cucumeris (Forbes), 1883. 
Hos!s.—Cotton ; Capsella; Impatiens sp. ; Cryptostegia grandiflora, etc. 
Literature — 
Glover, Pat. Of. Report, p. 62; 1854 (contains original description; reproduced again by 
> Ashmead, Can. Entom., XIV, p. 91, 1882). 
Gillette, Jour. Econ. Entom., 1, 3, p. 176; 1908 (A. gossypii and allies) ; id., 2bid., ITT, 5, p. 404 
(1910). 
Essig, Pom. Coll. Journ. Entom., III, 4, p. 590 ; 1911 (a complete description). 
Lefroy, Ind. Ins. Life, 1910 (mentioned on cotton). 
There are slight differences in the measurements of the Indian form as compared 
with those given by E. O. Essig for the American insect on Citrus species. 
This Aphid shows more distinct mottling than others; the pattern on the abdo- 
men of the alate female is made up of larger and clearer black spots and dashes, that 
is of two or three lines on the anterior abdominal and three stripes on the posterior 
abdominal segments, besides three precornicular carinal spots and another immediately 
internal to the cornicles. 
Antennae long, black, with slender articles, 
