1918.] BASHAMBAR Das : The Aphididae of Lahore. 171 
dominal band. On the fifth the inner spot just meetsthe third band, while 
the outer one just lies behind the cornicles. The segment behind has 
only two lateral spots. 
Wings large and broad; slightly smoky in appearance ; slightly dusky flattenings 
at apices. Veins very dark; cubitus with a double fork and obsolete at base. Stigma 
dark brown at the flattening with yellow insertions ; the stigma has a gentle curve as 
shown in the camera lucida drawing. 
Cornicles black, long and cylindrical, with a distinct rim reaching to the tip of 
the extended cauda. 
Cauda long, with one or two indentations ; dusky green. 
Anal plate semicircular. Genital plate brownish and made up of two darkish 
halves. | 
Ventral surface segmented and of a light greenish or yellow colour. 
Legs like the apterous female, slightly more dusky, without knobbed hairs. 
The rostrum just reaches the second coxae beyond the black sternal muscle-bosses. 
The lateral tubercles are absent. ; 
Measurements :— 
Body .. au 3 25.608.657. 
Antennae + LR .. » 1:60 MM 
Wing expanse .. + MMS SO 
Wing .. meee Re EHRE. 
Cornicle I 2 = .0:45-mm,. 
Cauda + Bet esos LOG" VE 
Life-mstory.—The species makes its appearance in October on old sickly-looking 
plants of Cannabis. The specimens from which the description has been prepared 
were collected in November near the bridge on the Ravi adjoining reserved forests. 
They multiply freely till some time in December when sexuales are produced. Only 
on one occasion, below a mango groove along the opposite bank of the Chhota Ravi, 
a few young oviparous females were secured. They resembled the apterous vivipa- 
rous female, except that the colour was pink and the hind tibiae stout and swollen 
on account of the presence of many small circular sensoria. 
No males were captured; probably they are alate and form a little earlier. 
Neither was it possible to collect the eggs. | 
In the absence of any definite data, which further observations might furnish, it 
can only be surmised that alate males and some migratory females fly off to some 
other host where, after the oviparous females have developed, the eggs are deposited 
to tide over the winter. 
Such an alternate host is probably one or more compositous plants, besides Can- 
nabis itself, on which the winter may be passed even in the parthenogenetic condition. 
. In March and April the species is sparingly present on Cannabis indica, in the 
angles between the ventral veins of the leaves. But it thickly infests the under sides 
of the leaves of Cnicus arvensis. It may be collected on the latter throughout May, 
