1918. | BASHAMBAR Das: The Aphididae of Lahore. 239 
Antennae very much like that of the apterous viviparous female; the spur is 
small. 
Proportions (on an average) : — 
tbe IV. V. ML 
14 6 6 63 +53 
Lengths,.. 0°23 O‘IO O‘IO O'II +009 mm. 
The whole length about three-fourths of a millimetre. 
Sensoriae from 5 to 7 on article III and from 2 to 3 on article IV. 
The primary sensoriae are provided with hair-rims and are normal. 
Both pairs of wings are of the same type as in Aphidinae; the veins are well 
marked and the stigma brown. 
The lateral tubercles on the abdominal segments are much larger and their sen- 
sorium-like character is brought out with great distinctness as shown in the figure. 
Cornicles more cylindrical than those of the apterous female, but of the same 
form and size; black, imbricated and subconical. 
Cauda more pointedly conical; the distal half bearing the usual curved hairs is 
black and toothed. The ratio of the cornicle and caudaisas5 to 8. _ 
Rudimentary gonapophyses three. 
Legs long; sole-pustules present above tarsi. 
The rostrum reaches up to the 2nd coxae; last joint twice as long as the one be- 
fore it. 
Measurements :— 
Body a" Er 7:90,89: 9A tata: 
Antennae LE i 075 TU. 
Wing expanse .. ne ALOE 
Cornicle ae ne E7000. 3, , 
Cauda de Sr OZ 
The insect has been collected only during May and June on Carthamus oxycarpa, 
a wild spiny compositous weed which grows very abundantly in waste land. The 
particular spot where it turns up every year is a fallow piece of land in the fields 
between the Chhota Ravi and the first ‘‘ Rakh’’ (reserved forest) along the road lead- 
ing to the railway bridge. 
There are a number of ant colonies in the vicinity and the Aphid is very rarely 
found unattended by them. Frequently a nest opens just about the roots of the 
host-plant and the ants coursing up and down the stems ate a sure sign of the pre- 
sence of the Aphid. : 
It is a striking fact that this Aphid does not thrive well when kept on plants in 
the field isolated from the ants. There are so many Aphid enemies to contend against 
during these months that only those colonies have a chance to live and grow that are 
protected by the ants. It was also noticed that plants on the craters of ant’s nests 
were thickly populated with Aphids, while those even a foot or two away were 
entirely free from them. Probably their distribution is controlled by the ants toa 
certain extent. 
