1918.] BASHAMBAR Das : The Aphididae of Lahore. 167 
The actual specimens in the Indian Museum labelled as Rhop. dianthi, upon Brinjal, 
that I had occasion to examine, proved mostly to be Aphis malvae, Koch; so the 
latter reference in the Jud. Mus. Notes is probably an error. 
- The Aphid may be found almost at any time wherever there is any kind of 
Brassica crop growing and then mostly in company with Szphocoryne indo-brassicae, 
n.sp. But its hosts are numerous and I have given below a list of plants on which 
it has been actually collected. 
_ The life-history appears to be much the same as in America, but details have 
not been properly followed out yet. 
This species is extremely abundant after August and September. Numerous 
plants serve as hosts as will be seen from the list. During October and November 
Brassica crops are their special favourites and they feed on these usually in company 
with Siphocoryne indo-brassicae. About the last week of November, from various 
herbaceous plants, large autumn migrants and alate males begin returning to young 
peaches and settle on the under side of the leaves. Throughout December this con- 
tinues. The colonies from whence they come themselves retain their parthenogenetic 
reproduction as usual, and there is hardly any perceptible diminution in numbers by 
their migration. 
The “return migrants’ are much larger and give birth to young which develop 
into deep pink. 
Oviparous females.—Egg-laying does not start before January, unlike what obtains 
in the west, where it is reported to commence as early as the first week of November. 
Winter is in no way detrimental to their life and viviparous females remain 
fairly active after sunrise even on the coldest days. They pass into spring in this 
manner ; when food is more abundant the colonies multiply quickly. 
As is the case with many other plant-lice in Lahore, this species also disappears 
about the beginning of May, and the earliest date for collecting it again is the last 
week of August as apterous viviparous females on cruciferous plants. 
It may be that some eggs hatch at this time, but then they do not hatch upon 
she peach: "1 
The ordinary predaceous and parasitic insects feed upon them. 
Systematic.—According to the investigations of Gillette and Cholodkovsky, the 
correct name for this species is Myzus persicae (Sulzer). It has been frequently 
referred to as Rhopalosiphum dianthi (Koch) in the literature on these insects. 
* The explanation offered by Gillette for the mistake about the genus is that the 
. “spring migrants’’ in this case possess cylindrical cornicles, while the ‘‘ autumn 
migrants” have them clearly clavate in their distal halves. 
In Lahore so far we have not secured any specimens with straight cornicles, they 
are always more or less swollen. 
Recently the species has been separated into a new genus (M yzordes) by van 
der Goot, 1913, along with two more similar Aphids. As this name has not been 
generally accepted yet I have retained the old one of Myzus persicae (Sulzer). 
Food-planis.—Myzus persicae (Sulz.) [= Rhopalosiphum dianthi (Schrank)] has 
