264 Memoirs of the Indian Museum. Vor Was 
anterior edge is pigmented as a distinct band. All the veins are striated transversely 
and, except the patch along the first oblique in the forewing, the pigmented parts and 
the margins bear complete or incomplete hexagonal figures, raised above the general 
surface on both sides. These are imbricated one above the other. 
The abdomen is somewhat oval, not so broad as long, like that in the apterous 
viviparous female, with which in other respects it exactly corresponds; the lateral, 
dorso-lateral and dorsal tubercles are disposed in the s same manner, as are also the 
rows of spots between them. 
The cornicles, like the abdomen, are slightly smaller than those of the apterous 
female; they are covered over by scattered hairs upon tubercles. Upon the mem- 
brane stretched across the mouth a black incomplete ring is prominent and charac- 
teristic. | 
The cauda and anal and Ai! plates are . similar. 
Legs reddish-brown; coxae, a ring on the femora, knees and tarsi black ; they are 
only a little longer than those of the apterous viviparous female. 
Rostrum large, extends much beyond the hind coxae, almost to the level of the 
cornicles and even beyond. A | 
The measurements on an average are :— 
Body iR er ee Saalraat. 
Antennae on ce 22 12,0 NET 
Wing expanse.. an 0 20, Les 
Wing re Li oe) 7422148 m. 
Cornicle a a .. 0'20x0'4I mm., base 0‘45 mm., 
apex 0'I5 mm. in diameter. 
Cauda (length) about Sr 202000 
The alate females that are produced in December and January are smaller in size 
than those developed earlier. Their bodies are much attenuated and therefore the 
wings, which are deeper black, appear comparatively long, extending much beyond 
the apex of the abdomen. They look very much as if they were males, but they lack 
their genital armature and by opening up the abdomen one always Er the ovarian 
tubes containing immature embryos of various stages. : 
These females seem to be the product of malnutrition, the flow of sap in the 
plants at this season being at its lowest. Most of them die without ever giving birth 
to a single young. 
A pterous oviparous female.—The apterous females that lay eggs appear in early 
January and are remarkably similar to the apterous viviparous females in external 
anatomy. There appear to be present in this case hardly any secondary sexual 
characters, which in other Aphids distinguish the oviparous from the viviparous 
female. Neither is there a change in colour or pattern or any difference in the 
posterior abdominal segments observable. Sensoria on the hind tibiae are entirely 
lacking. 
There may be a little more duskiness on the legs and a slightly greater curvature 
of the antenna near the basal part of the third article. The sensoria are not so well 
