220 Memoirs of the I ndian Museum. [Vor. VI, 
Proportions :— 
IT: IV. V. VI. 
07 IO 104 6+18 
Lengths .. 0°28 O'I6 O17 0‘I10 +030 mm. 
The spur and the 3rd article are subequal. 
The sensoria are often placed in pairs, some larger and some smaller, from 6— 
8 in number, usually 7. 
Wings large, with the usual venation; stigma greenish. 
Cornicles black, cylindro-conical, imbricate. 
Cauda with a slight constriction about its middle; base broad, hyaline; tip 
dusky. 
Measurements :— 
Body length .. “a ..: L'50—1 75 mm. 
Breadth a a .. 065—0'75 ,, 
Antennae ot = 2. 27° 722mm) 
Cornicle Br = RO 2ON 
Cauda a ie aie Ogle 
Wing expanse .. ie Soe SAONE 
In the apterous female the spur is always smaller than the third article; the 
cornicles about twice the cauda ; sometimes less than that. The cornicles and cauda 
are much longer than those of the alate female. 
Date of collection.—From October to December, also in March and April. 
Systematic.—Some doubt has recently been cast in Europe and America as to the 
distinctiveness of this species. It is supposed that Glovers’ A. gossypu is only a 
synonym of A. malvae (Koch), but the supposition has never been so far definitely 
established, and in American literature A. gossypii (Glov.) stands as a well-defined 
species. = 
There are numerous references to it and Pergande has listed upwards of thirty 
plants as its host (Riley’s Znsect Life, vol. III, pp. 309-314). It would not be sur- 
prising at all if some of these references at least refer to species other. than A. 
gossypii, and this may have been the origin for the doubt entertained by some 
writers. 
That the species is, however, a perfectly distinct one can be shown by its 
morphological characters as is clear also from the table given above (p. 213). 
Aphis nasturtii (Kalt. ?). 
Host.—Nasturtium sp. (N. indicum ?), found in moist places along the margins 
of ditches and water-courses. 
| [M. Das has in a clear and distinct way succeeded in separating Aphis gossypu, Glov., from allied 
forms, such as A. malvae, Koch. His work will definitively extinguish the confusion, which until now 
has reigned on this subject P.v.d.G.]. 
