2025 Memoıirs of the Indian Museum. [Vor. VI, 
sum on the fifth abdominal ring and encroach upon the fourth and the sixth as well. 
Over the surface there are numerous hairs and the truncated end is bounded by a rim, 
across which is stretched a white membrane. Upon this membrane lies another black 
incomplete ring. The diameter at the apex is about one-third of that at the base. 
The secretion from the cornicles is dirty black. : 
The cauda is a flattened semicircular plate with its posterior convex edge much 
thickened, black and strongly spiny; it is attached by its broad base and does not 
project much beyond the body. 
Anal plate below large, broadest in the middle; black and spiny like the cauda. 
These two structures bound the anus, which is a large opening facing postero- 
laterally. The clear drops of limpid “‘ honey-dew’’ exude at this place and are 
thrown off at very short intervals of time. 
Genital plate smaller, somewhat elliptic in form ; it forms the anterior boundary 
of the genital aperture. In colour and spinose character it resembles the anal plate. 
Three rudimentary gonapophyses are to be discerned as faintly marked small 
processes, with a few spines to each. 
The ventral surface in living specimens is silvery white on account of its pruinose 
character. The colour otherwise is dark purple, due chiefly to a similar tinge of the 
body juices. Near the lateral edges on either side runs a row of large black 
spots. 
The legs are remarkable for their length; the hindmost are the longest and 
proportionately longer than in most other Aphids. The colour is shining orange or 
reddish-brown, with some parts pitch black. 
In the hind legs the coxae, their membrane, a small patch to the outer surface of 
the femora, the femoro-tibial joint, the ankle and tarsi are quite black. Most of the 
femora and tibiae are orange brown, the later shading into a darker colour. The 
tibae are a little less than double the length of the femora and are a little curved 
towards their distal half as shown in the camera drawing. 
Tarsus.—There are no sole-pustules present on the tibial points; the first joint 
of the tarsus is about one half the length of the second; the latter is furnished with 
two stout claws. The other legs are shorter but similarly coloured ; on the middle of 
the femora they bear a complete ring of black which may sometimes extend very 
near to the coxae. 
The rostrum is remarkable for its length; it reaches much beyond the level of the 
third coxae, often up to the level of the cornicles and even further in thinner speci- 
mens. The longest article is brownish in colour, while the last two are black and 
subequal. ‘The three setae that may be seen in the ventral groove are very long, while 
the labrum at the base is a well-developed, narrow, triangular piece, overhanging the 
setae. The rostrum in the new-born young is proportionately much longer and pro- 
jects like a tail from the ventral side of the body end. 
The face is shining black, elevated from the middle of a depression, bounded by 
a mealy ridge which runs on its anterior and lateral sides as a white line. 
The measurements on an average are as follows : — 
