162 Memoirs of the Indian Museum. 
Alate viviparous female. 
(1) Body broader. 
(2) Antennae 3°55 mm. to 42 mm. 
(3) Sensoria very many (Essig); from 
42—48 (Theobald); over entire 
More 
Alate viviparous female. 
(I) Body narrower. 
(2) Antennae 3°0 mm., quite similar to 
that of the apterous female. 
(3) Sensoria on 3rd article never more 
than 16; from 14—16 ventral and 
in one line. 
(4) Pattern on abdomen: three lateral 
spots large and two smaller ; 
patches at bases in front and be- 
hind absent; also the dark band 
on the last segment. 
Two tows of spots in last grooves; 
two spots in front of and in line 
with cornicles; transverse marks 
on the middle of first two ab- 
dominal segments present. 
length. 
(4) Pattern on abdomen: three spots on 
sides; a black patch at bases of 
cornicles ; a crescentic one in front 
and two dark patches behind on 
either side ; last segments with a 
black stripe. 
There are also some other minor discrepancies which can be explained as indivi- 
dual variations, but in view of the above account it forms a very good species. 
Twice a year roses in Lahore produce new shoots, once in March and again 
about October or November. At both these periods the ‘‘ Rose Aphis’’ can be col- 
lected. My dates from the City Circular Gardens and the Botanical Garden have 
been early December and March-April. As there are always a few young shoots 
present throughout the winter it is true that the species remains actively viviparous 
during this period, but after April or early May no trace of it is to be found in the 
plains. Whether it migrates or deposits eggs after producing sexual forms on the 
approach of summer is still undetermined. 
Natural enemies :- - 
(I) Lysiphlebus sp. which extensively parasitises it. 
(2) Syrphids, several species. 
(3) Coccinellids, chiefly Chilomeles sexmaculata, often clearing twig after twig. 
Unlike the European Rose Aphis there is no pink variety in the case of this 
insect. 
Macrosiphum granarium (Kirby; Pergande). 
““WHEAT GRAIN-LOUSE.’’ 
Literature :— 
Buckton, Brit. Aph., vol. I, p. 114. 
Pergande, U.S. Dept. of Agric. Div. Ent. Bull. 44, 1904. 
Theobald, Jour. Econ. Biol., vol. VIII, 1913 (gives description and figures; a part of the acccom- 
panying illustration is copied from Theobald’s figure). 
The large wheat plant-louse is easily recognisable in the field from the brief 
diagnostic characters already given above (p.157). Itinfests several graminous crops 
grown in winter, more especially wheat, barley and avena. 
