L*U JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, 1891. 



find that in the Rajputana area egg-laying generally takes place at the beginning 

 of the south-west rains, in June or July, and again, if the conditions happen to 

 be favourable, ahout October ; while in the North-west frontier area, egg-laying 

 generally takes place in March or April, and again, if the conditions are favour- 

 able, about August. To this rule, as will be seen from the following analysis, 

 there have been several exceptions, which may, however, perhaps, be explained by 

 supposing that flights from the one area have been carried by chance winds, so 

 that they have oviposited in districts which are usually visited by flights belonging 

 to the other area : — 



The records which have been found of egg-laying in the invasions of 1889-90, 

 1869 aud 1863, in all of which the species Acridium peregrinum was concerned,* 

 are as follows : — 



Invasion of 1889-90. — In 1889 egg-laying took place in June and again in October 

 in Jodhpur and Ajmere-Meruara, and in August and September, and again 

 in October, in the Dera Ismail Khan district. In 1890, in March, in the Pesha- 

 war, Rawalpindi, and Shikarpur districts ; in June in the Jodhpur and Bikanir 

 States, and in the Gurgaon district ; in August, in the Koliat, Amritsar, and 

 Ferozepur districts. 



Invasion of 1869. — Egg-laying took place in the end of May in Jodhpur; in 

 July in Deesa, Tonk, and Hissar, and again in the latter part of September and 

 beginning of October in Hissar ; while in the Dera Ismail Khan district egg-laying 

 took place about April. 



Invasion of 1863. — Egg-laying took place in February and March in the Shahpur 

 district, and in July and August in the Hissar district. 



Isolated flights. — Turning now to the records of more isolated flights which have 

 appeared in other years, and which no doubt in most cases were composed of 

 insects belonging to the species Acridium peregrinum, though there is no direct 

 evidence to this effect beyond the fact that they appeared in regions subject to the 

 invasions of that species. In 1821 eggs were laid on about the 20th of June in 

 Etawah ; in 1864 about] July in Hissar ; in 1865 about the beginning of June in 

 Hissar ; in 1866 about July in Hissar, and also in Bikanir ; in 1870 in August in 

 Amritsar; in 1872 about July in Jodhpur, also in the early part of July in Roh- 

 tak and Jhelum ; in 1879 early in March in Meerut; in 1880 in April in Jullundur. 

 "With regard to this last there is some doubt as to the identity of the species 

 owing to the fact that Jullundur is sometimes invaded by other species, such as 

 Acridium melanocorne and Acridium succinct um. 



With regard to the breeding of the insect in the vast area extending from the 

 Indus to the Red Sea, too little is known to throw any light upon what goes on 



* Specimens taken from a flight which visited the Mozaffurgarh district in 18f»3 

 preserved by Mr. W. Coldstream, establish the identity of the 18R3 locust; while the 

 united witness of a number of the reports leaves no room to donbt all that the locust 

 .,i ISO'.) was idontical with that of 18G3 and of 1889-90, though no authentic specimens 

 ;.^v" yel !ieeu discovered. 



