244 Memoirs of the Indian Museum. _ Vor. NE 
ably migrates to some other place. The further life-history and the formation of 
sexuals has not been noticed. 
There are the usual insect enemies; specially active are Scymnus communis. and 
Chilomeles sexmaculata. 
The small brown ants (Myrmecinae) and larger ants (Camponotidae) are always 
found attending the Aphid colonies. 
Callipterus trifolii (Monell). 
, (Lucerne or Clover Aphis). 
Synonym.—Chaitophorus maculatus, Buck. 
Literature :— 
(1) Monell, Canadian Entom., XVI, p. 14, 1882 (contains the original description). 
(2) Ind. Mus. Notes, IV, p. 277, and a reprint of the same in Indian Insect Life by Lefroy, 
p. 746 (gives an indifferent description with figures under a wrong name). 
(3) Davis, Ann. Entom. Soc. America, I, 1908 (gives a description with figures). 
This Aphid is very widely distributed in India and has been collected at most 
of the places where lucerne {Medicago sativa) is grown as horse fodder. 
The first notice of it is to be found in Indian Mus. Notes, Vol. IV, no. 5, 1899, 
when it was reported from the Jodhpur State Farm. 
The specimens were submitted to Buckton who gave a short description of it as 
a new species of Chaitophorus. It seems to have nothing in common with the 
characters of that genus but, as reported to me by Mr. J. J. Davis and compared with 
published descriptions, is evidently identical with the American insect Callipterus 
trifolii, the yellow Aphid of clover. 
I have found it in several districts in the Punjab on various species of M edicago, 
also on the introduced Egyptian clover, from March to May. The lucerne Aphid is 
medium-sized, somewhat fusiform, pale yellow in colour, with rows of dusky spots on . 
the back. These spots make it appear under a low lens or to the naked eye of a dark 
grayish colour or mouse colour. 
It is extremely sensitive and the adults are very often found singly or with a 
brood of a few young around them. With the slightest touch or shake of the twig, 
on the under sides of the leaves of which they may be sitting, they fall to the 
ground. After remaining perfectly still for a short time—feigning death—they 
scramble up the branches again. On account of this habit it has been found much 
easier to collect them by spreading a piece of cloth under the plant and then shak- 
ing it gently. The young are not so active, nor are those that are about to moult 
or that are reproducing. à 
Both apterous and alate females reproduce PAR re which is sa to 
be rather unusual in this genus. 
As accurate and fairly detailed descriptions are available in American literature, 
no further morphological account is given here. 
Systematic.—The generic position of this species seems to be an unsettled question 
so far. That it is not a Chaitophorus, as Buckton took it to be, is perfectly clear. It 
