174 Memoirs of the Indian Museum. VON 
Liosomaphis with Rhop. berberidis (Kalt.) as its type, and described it in the Zoolo- 
gist, 1860, p.1119. The distinctive characters were:— 
(1) Antennae shorter than body. 
(2) Seventh joint smaller than third. 
(3) Cornicles clavate on one side and about one quarter the body length. 
The genus was never accorded any acceptance and Buckton brought back “ Li 10S. 
berberidis’’ under Rhopalosiphum. 
Wilson has attempted to revive it in his “Key to the genera of Aphidinae’’ 
(Ann. Entom. Soc. America, 1910), but apparently not with much success. 
If we accept van der Goot’s latest definition we should place Lios. berberidis © 
under Siphocoryne, and after examining the insect I am of opinion that in spite of its 
very small frontal tubercles its natural affinities are with Siphocoryne. We may 
then for the present score off the genus Liosomaphis. 
But Szphocoryne when thus defined forms quite a heterogeneous group including a 
large number of species. These have been proposed to be broken up into more 
natural subdivisions of generic importance by van der Goot and Theobald. The dis- 
covery of some new forms in the Punjab has necessitated the addition of two more 
genera. The whole view of the present situation can be summed up by giving the 
characters of the various genera proposed in tabular form. 
APHIDINE GENERA WITH CLAVATE CORNICLES. 
I. Antennae of apterous female provided with secondary sensoria. Rhopalosiphum, Koch. 
II. Antennae of apterous female without sensoria (A). 
(A). (i) Capitate hairs over the body, cornicles clavate only on one side, frontal tubercles 
absent. Stephensonia, gen. nov. 
(ii) Capitate hairs absent; cornicles clavate on both sides; frontal tubercles indistinct. 
or absent (B). 
(B). (i) Cornicles smaller than or subequal to cauda. Brevicoryne, gen. nov. 
(ii) Cornicles longer than cauda; frontal tubercles absent or inconspicuous (C). 
(C). (i) A large precaudal tubercle present on the dorsum. Tuberculaphis, Theobald. 
(ii) Large precaudal tubercle absent (D). 
(D). (i) Lateral tubercles on first and seventh abdominal segment present. Siphonaphis, 
van der Goot. 
(ii) Lateral tubercles on first and seventh segment wanting. Szphocoryne, Pass. 
I am not quite sure whether we should differentiate genera by the presence or 
absence of lateral tubercles on the first and seventh segments, as van der Goot has 
done in creating a new genus Siphonaphis with S. nymphae as type. In this paper, 
therefore, the species has been retained in the old genus Siphocoryne. 
It is also worth noting here that Schouteden had adopted the name Hyadaphis 
of Kirkaldy in place of Siphocoryne, Pass. on the grounds of priority (Catal. des 
Aphides de Belgique, 1906, p. 40). This name, in part, was taken by some American 
authorities, but its claim to priority has been discovered to be not very well founded ; 
hence we again consider Siphocoryne, Pass. as the true and appropriate name. 
The species met with in the Punjab have been dealt with separately in the fol- 
lowing pages. 
