212 Memoirs of the Indian Museum. Vor Wag 
Measurements :-— 
Body length .. Se .. 155—1:65 mm. 
Abdominal breadth ae .. 0°38—0'°42 ,, 
Thoracic breadth ir 0.2050 —0'54 ,, 
Antennae ne ER en, 
Cornicle = a, VONT ee 
Cauda ag ss 120 00 ME, 
The alate viviparous females, produced at the same time when these males form, 
are unusually large; the dimensions of their wings, body and antennae are all greater 
than the males. The number of sensoria on article III may be as many as 24; on | 
IV 6-7, some individuals were found with about 5 or 6 sensoria on their 5th article 
as well. 
No oviparous females were collected and are probably never developed on 
Cynodon. Later the size of the apterous and alate females, that were still present 
on the grass in March, grew extremely small; their colour also was very light 
greenish. 
Life-cycle.—The life-cycle, therefore, after the migration of winged males and 
females from Cynodon in February, is not known. ‘The insect is not noticeable after 
March. We have again seen apterous viviparous females multiplying actively on 
Panicum sp. in June, in the Botanical Gardens not far from the place where the 
original colonies existed. These looked remarkably like ‘‘stem-mothers” of other 
Aphids, and in all likelihood had hatched from eggs laid upon these plants some time 
previously. Therefore, though we have not been able to actually collect either the 
oviparous females or the eggs, inferentially it seems correct to conclude that after 
March eggs are laid on species of Panicum growing along water-courses. These 
hibernate in the hot summer months of April and May, ARR in June if there is 
an early shower of rain. 
The point that needs clearing up is, whether the migrant females and males do 
return to Panicum, and whether the progeny of the former develop into oviparous. 
females. From June to March the food-plants are abundant on which the species 
can conveniently subsist. 
Enemies.—Larvae of the smaller kinds of Syrphids destroy whole colonies of this 
species ; several Coccinellids also abound among them. 
MALVIFORM GROUP OF APHIS SPECIES. 
The characters common to the species of this group, besides their extremely 
polyphagous nature, are :— 
(1) Body more or less oval, from dull or mottled green to lemon-yellow ; 
usually a row of oil globules, coloured yellowish or greenish, between 
the cornicles. 
(2) Cornicles tapering, black. 
