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208 Memoirs of the I ndian Museum. VOLS wile 
Systematic.—-The species doubtfully belongs to the genus Aphis, at least it is a 
very aberrant one. The points of difference are noted below :— | 
(1) The antennae in the alate female are about as long as the body, not 
smaller. 
(2) The cornicles are small, hardly three times as long as broad, not four — 
times or more. 
(3) The cauda is subequal or even longer a the cornicle, not distinctly 
smaller 
- (4) The wings are clouded with pigment, not hyaline as is usual in A phis.' 
Aphis maidis (Fitch). 
Synonyms. —A. adusta (Zehnt.) 
A. sorghi (Theobald). 
Literature :— 
(x) Fitch, Second Report on the Insecis of New York by Sie Enomolonse 1856 (ES 
description). 
(2) Oestlund, Synop. Aphid. Minn., 1887, p. 56 (alate insect described). 
(3) Webster, The Corn-leaf Aphis. U.S. Dept. Agri. Circ. No. 86, 1907. 
(4) Davis, U. S. Dept. Agri. Bur. Ent. Tech. series, No. 12 (account of biological studies on this 
and two more Aphids; mentions full bibliography ; a description without figures is also 
added). 
(5) Agri. Dept. of India, Pusa, Behar. A plate under the name of nent aphis”’ has he 
issued, but is more of popular interest than of any scientific value. 
(6) Ind. Ins. Life, p. 747 (identified by Schouteden as A. adusta on “juar’’, Sorghum valgare). 
I have not seen good figures of this and therefore have given some, 
showing morphological details. 
Distinguishing characters.—The Wheat rose or the Corn-leaf ae invariably 
takes up its position in the half rolled-up young leaves of various graminous crops. 
It is only on maize and Panicum colore (a grass) that it attacks the inflorescence. 
The blue-green colour and long oval body, with two black spots surrounding the 
bases of the short black cornicles, always conspicuous in the light-coloured individuals, 
are unmistakable marks of its identity. 
The alate form is never abundant and is often entirely absent; the structure of 
the antennae only separates it from another similar species (Siphocoryne avenae) on 
the same crop. The spur of the 6th article is a little over twice the base. 
The alate female would often be mistaken in the field for Siphocoryne avenae ; 
more so because both migrate to wheat and Avena seedlings in November, and are 
seen as isolated specimens. The black body and head with similar antennae and 
very short second fork of the cubitus are characters common to both. ‘The number 
of sensoria on the joints differ, and the spur of the 6th article in Siphocoryne avenae 
! [The writer has placed Aphis sacchari, Zehnt. in a new genus called Longiunguis, v. d. G.; to this 
genus belongs another species, Longiunguis odinae, v. d. G., which is common in Java and has been col- 
lected too in Ceylon by the late Mr. Rutherford. P. v. d. G.] 
