1018.] * BASHAMBAR Das: The Aphididae of Lahore. 179 
Aphid I consider it necessary to establish a new genus for it. The systematic position 
it would occupy would be somewhat intermediate between Myzus and the old genus 
Rhopalosiphum on one side and Siphocoryne, Pass. on the other.' 
It is a great pleasure to me to dedicate this interesting insect of Lahore to Pro- 
fessor J. Stephenson, D.Sc., I.M.S., as a token of the highest esteem in which he is 
held by his pupils and colleagues. A distinguished biologist himself, it is he to whom 
we owe practically all we have of Biology in the Punjab, and but for his active 
encouragement throughout and allowing me every possible facility in its study, this 
little work on Aphids could hardly have been undertaken, far less carried out to any 
completion. 
The specific name, it is expected, would help to permanently associate his name 
with the city where he has carried out his many researches. 
Brevicoryne, gen. nov. 
Body elongated oval, stout, flattish; strongly mealy; two posterior segments 
arching over cauda. 
Antennae much smaller than body, particularly of the apterous viviparous female ; 
the spur is smaller than III. 
Lateral tubercles usually wanting except in Brev. brassicae, Linn., where they are 
small, but distinct. 
Cornicles very small in size; clavate on the distal half, narrowed into a neck 
below the vasiform tip ; in apterous females they are more or less cylindrical, much 
thinner near the apex. 
Cauda prominent, larger than the cornicles and long conical in form. 
Other characters much as in Siphocoryne. 
Three species are included under this genus :— 
(I) Brevicoryne coriandri, sp. nov. 
(2) Br. chenopodii (Schrank). 
(3) Br. (=Aphis) brassicae (Linn.). 
They together constitute a fairly homogeneous group or subgroup ; otherwise all 
three would form very aberrant species of Siphocoryne. 
! [I am in doubt, whether the morphological characters of Slephensonia lahorensis, Das, really neces- 
sitate the erecting of a new genus, separate from Siphocoryne (Pass.), v. d. G. 
The clavateness of the cornicles in Stephensonia is small, indeed much smaller than in true Siphoco- 
ryne species such as S. berberidis, S. xylostei and S. ligustri. But we find the same kind of slightly 
swollen cornicles in Aphis padi, L. (=A. avenae, Fabr.), and this species has now by nearly all authors 
been put under Siphocoryne ! 
The very short capitate hairs of St. lahorensis are a little more aberrant, since all true Siphocoryne 
species are nearly naked ; however, this character alone is not sufficient to establish a new genus. Other 
separate characters, as mentioned by Mr. Das, such as the dark colour of the veins, are in my opinion 
of no generic value. It therefore seems advisable to me to sink the genus Stephensonia and place the 
species Stephensonia lahorensis, Das, back in the genus Siphocoryne (Pass.), v. d. G. P.-v. d. G.]. 
