1918. | BASHAMBAR Das: The Aphididae of Lahore. 153 
Fore-wings with the media I! simple; media IT and cubitus with a short common trunk. Hind- 
wings with 2 transverse veins. 
Legs well developed ; trochanter not separated from the femur. P. v. d. G.]. 
It may be mentioned here that the insect under review has several structural 
characters in common with Pemphigus (?) cynodonti described below. 
There is another similar Pemphigus infesting the leaves of the same Pistacia in 
the Punjab Hills near Kasauli. It forms only pseudo-galls by reflecting a part of the 
leaf over the rest of its surface. The alate females develop in July. The sensoriae 
on the antennae are more rounded and tuberculate; the wings, glands, etc., are alike, 
but rudimentary gonapophyses are entirely wanting. 
All three species seem to fall in the same category though an entire lack of gona: 
_pophyses in one is rather a remarkable feature. 
Pemphigus (?) cynodonti, sp. nov. 
Host.—Cynodon dactylon. 
Vern. Dub grass. 
Locality.—River bank near railway bridge; canal bank in the Botanical Gardens. 
Distinguishing marks.—In moist places, from November to March, one often 
notices some of the lowest suckers of Cynodon very much stunted in growth, pale 
yellowish, and in places pink-coloured. All the leaves are much smaller than nor- 
mal ones and hypertrophied breadthways, while they appear to arise in a bunch, 
due to arrest in the growth of internodes. Such pseudo-galls contain numerous dull 
green insects covered over with long threads of iridescent gray flocculence issuing 
from rows of glands on their backs. One such branch is shown in the accompanying 
sketch (pl. xiv, fig. 10) besides a normal healthy shoot. The ground below is sprinkled 
over with white pulverescence. 
Only apterous viviparous females are generally met with. Six rows of glands on 
the body, those on the head having chitinous rings encircling them; absence of cor- 
nicles and visible cauda, very small rostrum and two rudimentary gonapophyses are 
further characters to distinguish this aphid. In winged females the cubitus is simple 
and the sensoria irregular. 
MORPHOLOGICAL DESCRIPTION. 
Apterous viviparous female.—Body ovate to oval, stout, from light greenish to 
dull dirty green: in March individuals lose most of this green tinge and look almost 
whitish, even after removal of the ordinary clothing of white meal. 
Long white threads are particularly abundant on the head and the anal end, 
where they flow into a thick tail. Each of these larger threads is made up of smaller 
ones that issue from cells below the chitinous layer of the body, see pl. xiv, figures 1 
and 2. | 
À white powder is secreted, at least it is found over the whole body. 
The posterior end is often tuckled in. 
! [I follow the nomenclature of veins as used by lullgren and others; in this description media I= 
cubitus, media II= first discoidal and cubitus = second discoidal of Mr. Das’ descriptions. P. v. d. G.] 
