1918. | BASHAMBAR Das: The Aphididae of Lahore. 261 
the tubercles near the lateral edge are very small and represented by a few hairs; the 
rest of the dorsal surface is covered over by the whitish pruinose secretion and forms 
a conspicuous band or white area. 
Both of these thoracic segments bear conical lateral tubercles, situated a little 
above the coxal membranes of the leg joints. The groove behind has four spots upon 
it, two median and two latero-dorsal which are larger. 
Abdomen globular or ovate, thickest about the cornicles ; it is exactly bilaterally 
symmetrical and is made so by a mealy line which runs longitudinally in the mid- 
dorsum and can even be traced over the thoracic segments, up to the head. Imme- 
diately on either side of it, each abdominal segment carries a conspicuous black pro- 
jection—the ‘‘ dorsal tubercle,’’ surrounded at its base by a concolorous circular spot 
and beset with short radiating hairs. Near the lateral edge there is another flattish 
tubercle with similar hairs, which might be termed the ‘‘dorso-lateral’’ tubercle. 
Just on its outer side there is one black spot. 
Upon the groove, which divides two consecutive segments, are placed six black 
round spots; one pair in front of the “dorsal tubercles,’’ and one pair on either side 
in the space between these and the dorso-lateral tubercle. The spots are quite black, 
with a round depression in the centre; after treatment with caustic potash it is this 
depression which remains black, the rest becoming bleached. 
The first three segments are quite like each other; on the fourth the dorso-lateral - 
tubercle is very small and upon the fifth and sixth it is represented by small spots 
only, over which a blackish broad band runs backwards and outwards from the corni- 
cles to the lateral border. In all other respects these segments are similar, but the 
dorsal tubercles of the seventh segment are very large and transversely flattened and 
apparently confluent with the 7th dorso-lateral tubercles. On the eighth segment they 
are alike but smaller. 5 
Pattern.—The pattern, therefore, consists of two dorsal rows of tubercles and two 
dorso-lateral. Of the spots there are eight longitudinal rows, two dorsal, four dorso- 
lateral and two almost lateral. In addition to these, each ring of the abdomen carries 
a prominent lateral tubercle situated on the carinae with spots alternating with the 
tubercles.' The ultimate segment is telescopic and forms a ring encircling the cauda 
and the anal plate. 
Cornicles large, black, truncated cones; their bases are very broad and sur- 
rounded again by black basal areas, which occupy a considerable portion of the dor- 
! [The description of the arrangement of tubercles, etc., as given by Mr. Das, is in my opinion not 
fully correct. x 
We find 2 spinal (=‘‘ dorsal’’) tubercles on the dorsum of the mesothorax, metathorax and the 
abdominal segments I—6. On segment 7 and on segment 8 there are two large, oval, chitinous 
“ pleural’’ plates, but no “ tubercles.” 
On the margins of the abdominal segments 1—3 there is visible on either side a chitinous rounded 
plate, which in my opinion cannot be termed a “ tubercle ’’ (= “ dorso-lateral’’ tubercle of Mr. Das). 
The “ prominent lateral tubercles situated on the carinae’’, as mentioned by Mr. Das, I have not 
been able to discover. Perhaps Mr. Das may have mistaken the large stigmata for them? P.v.d.G.]. 
