.iassid m . 
739 
prothorax. The insect is a pest to some varieties of castor especially, 
but is not usually destructive to castor grown as a field crop. 
Typhlocyba sudra, Dist., is sometimes curiously abundant on Bauhinia 
and it is a striking commentary on the dependence of these sucking 
insects on their food-plants to see a tree with the leaves yellow and 
withering from the depredations of this insect when none live on 
neighbouring trees. Annandale records their occurrence in Calcutta 
and we have seen a remarkable case of this kind at Pusa, a tree with 
every leaf covered with 
them in all stages and 
which put forth and 
maintained healthy 
foliage only after 
thorough spraying. 
Collecting .—There is 
much to be done before 
the Jassids of tropical 
India become properly 
known and the num¬ 
ber of species recorded 
only from Pusa or Cal¬ 
cutta in^tropical India 
shows how little the 
family has been col¬ 
lected in the plains. 
Still more is there 
room for life-history 
and bionomic work 
and no group offers 
such facilities for re¬ 
search on the relation 
between the vigour 
of the plant and its 
immunity from these 
and kindred pests. 
