1918. | BASHAMBAR Das: The Aphididae of Lahore. 183 
The males appear on Coriander in January, and quit the plants along with 
other migrant females soon afterwards; they probably have some alternate host which 
so far is unknown. It is also possible that they go to other Coriander plants, 
although no oviparous females have been collected at any time during the year. 
During March and April Coriander plants are again badly attacked. It remains to 
be determined whether these hatch from eggs laid on the plants or migrate from 
another host. The summer history after April to October is also obscure. 
Hosts.—The chief host is Coriandrum sativa; occasionally a few stray specimens 
were captured on Foeniculum (Fennel) and Carum capticum, but they do not infest 
these plants. Coriander is often so much weakened that in bad attacks whole beds 
are killed. At the same time also a fungus (Urophlyctis coriandri) is seen on these 
plants, which causes smaller or larger blister-like swellings and a good deal of hyper- 
trophy of the stems, leaves and fruits. 
The aphids may be the cause of rendering the plants less strong and so less resist- 
ing to the spores of the fungus, thus causing a double injury, one direct and the 
other indirect. | 
The larger Coccinellids and Syrphids act as natural checks, but they are par- 
ticularly liable to the attacks of a species of the fungus Empusa. Such specimens 
become reddish before death, instead of yellowish-brown as is the case when killed 
by Entomopthora. 
The Coriander Aphid of the Punjab is evidently a different insect from a similar 
one in the West (Siphocoryne foeniculi, Pass) known to infest several umbelliferous 
plants. The Western insect was originally described by Passerini (Gli Aphidi, 1860) 
from Italy, and Buckton published an account of the European insect with a coloured 
plate in Brit. Aphidae. There is little doubt that the Punjab insect, though having 
as its host a member of the same group of plants, is not identical with it 
Siphocoryne comii, Davidson, on hemlock, seems to resemble it in certain respects, 
but is differentiated at once by the lengths of the antennal articles and the relative 
size of the cauda and cornicles. The former, as given in the Journ. Econ. Entom., 
II, p. 304, 1909, is much smaller than the latter in the ratio of 3 to 4. 
| There is no other Siphocoryne known to me that may be even remotely similar 
to it, and taking it to be an undescribed species I have named it after its host. 
à Moreover, from the typical genus Siphocoryne it departs in certain important 
structural features, especially in the form, size and relative lengths of the cornicle and 
cauda, as well as the general characters of the body, antennae and lateral tubercles. 
In view of this it has been separated along with two other species into a small 
group comprising the new genus Brevicoryne. Diagnostic characters are given above 
and also in the table of genera under “ Club-Cornicled Aphids.’’ 
Brevicoryne chenopodii (Schrank). 
Host.—Species of Chenopodium, specially Ch. alba. 
Distinguishing marks.—The insect is often conspicuous by the pod-like galls— 
rather pseudogalls—into which it changes the leaves of the herbaceous weed men- 
