120 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. VIII. 
“THE LOCUSTS OF BENGAL, MADRAS, ASSAM, AND BOMBAY. 
By E. C. Cores. 
(With one plate.) 
A report has recently been issued on the subject of Acridiwm peregrinum, 
which is par excellence the locust of North-Western India.t In gathering to- 
gether the materials upon which this report was based, information was 
obtained concerning other locusts which have from time to time proved 
destructive in Bengal, Madras, Assam, and Bombay. The present report, 
therefore, is intended to record what has been ascertained about these other 
locusts. To complete the subject, ashort réswmé has been added of what is 
known of the chief locusts that are found in other parts of the world. 
The principal sources of information have been the reports and specimens 
furnished by the Revenue and Agricultural Department of the Government of 
India, and by the Agricultural Sections of the various Local Governments in 
India, but reference has also been made to the more important papers published 
in the United States, Algeria, and Europe, on the subject of locusts. 
A short preliminary sketch of a portion of this paper was submitted in 
November, 1889, since which date a good deal of fresh information has 
accumulated. 
The writer takes this opportunity to acknowledge the help which has been 
most kindly afforded by Dr. Henri de Saussure in identifying species. 
Locusts IN BENGAL, 
In Bengal, it is chiefly in the comparatively dry country to the west that 
locusts appear, though occasionally flights traverse the whole of Bengal and 
even penetrate into Assam, These flights are composed of insects belonging 
to different species, and there are at least three distinct sources from which 
they come. In the first place, flights of Acridium peregrinum occasionally 
penetrate from the North-West frontier into Bengal. This was the case both 
in 1863 and 1890. An account of what is known of these flights is given in 
the report on Acridium peregrinum. Secondly, flights occasionally penetrate 
into Bengal from the highlands of Southern India, and in these cases they 
probably belong to some of the various species which occasionally prove 
destructive to crops in the Madras and Bombay Presidencies and in the 
Central Provincest. This was probably the case with the flights of 1877 and 
1878, notices of which are given below. ‘Thirdly, flights are believed occa- 
* Reprinted from Indian Museum Notes with the permission of the Trustees. 
f See Journal, Bombay Natural History Society, Vol. VI, page 242. 
1 The chief of these species are said to be Acridiwm succinctum, Pachytylus cinerascens, 
Acridium eruginosum, Acridium melanocorne, Tryxalis turrita, Hieroglyphus Surcifer , 
Caloptenus erubescens,; Caloptenus eruginosus, Cyrtacanthacris ranacea, Oxya furcifera, Eu- 
prepocnemis bramina, Oxya velox, and Chrotogonus sp. 
