1918.] BASHAMBAR Das: The Aphididae of Lahore. 189 
sickly plants present the appearance of being oiled over, on account of the profuse 
honey-dew that is excreted and which falls on the lower parts. 
Myzus persicae is frequently found along with it in varying proportions, but it 
can easily be made out even with the naked eye. 
It is also quite distinct from the European Aphis brassicae (Linn.), but appa- 
rently has been confused with it, and it is in all probability this species that has been 
referred to as such in Lefroy’s books ““ Indian Insect Life’? and ‘‘ Indian Insect 
Pests,” as well as in the list of vernacular names for common pests. A plate has also 
been issued by the Imperial Entomological Department at Pusa, which is quite good 
from an artistic, but of little value from a scientific, point of view. 
It is quite likely that the Aphis brassicae, Linn. as mentioned in Indian Museum 
Notes is also more often this Indian Aphid than the European insect. The latter 
is also met with in India, and in this paper an account of it is given under Brevicoryne 
brassicae (Linn.). It is not at all so abundant and common, and when present it 
chiefly attacks cabbages or turnips, at least this is the case in the plains and hills in 
the Punjab. : 
The distinguishing features of this Aphid are the following :— 
(I) A very slight meal on the body (abundant in A. brassicae, Linn.). 
(2) Two median rows of squarish spots and two more on the lateral sides. 
These spots appear bright and shining in contrast with the dull greenish- 
White of the body. At these spots meal is entirely absent, so that they 
become easily wet with water. | | 
(3) Posterior abdominal segments banded. 
(4) Black clavate cornicles which are longer than the cauda ; a very prominent 
genital plate and many sensoria on the 3rd and 4th antennal article 
of the alate female. 
(5) The oviparous females have from twelve to eighteen eggs. 
Apterous oviparous female.—This form appears in November and December on 
turnips (Brassica rapa) and mustard (B. juicea) and is quite similar to the apterous 
viviparous female in form and colour. 
Antennae black, except the basal part of the 3rd joint. 
Cornicles slightly smaller, not so clavate and narrowed at the tip. 
Cauda broadly conical without the middle constriction. 
Posterior legs characteristically swollen and smaller. 
The hind tibiae in the oviparous female are about (5/6) five-sixths of those in the 
apterous viviparous female (45:56). Its proximal two-thirds is beset with numerous 
small, rather irregular sensoria, often in groups of two or three; their rims are not 
so well defined as of those of the antennal ones in the alate female. 
The body, if the eggs have not been laid, is distended. The number of eggs is 
quite unusual; from twelve to eighteen may be dissected out from a single indivi- 
dual. This is even more than the number that are to be found in much larger Aphids 
of the Lachnine tribe. 
