96 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



Hospital. He also attempted to discover the insect carrier 

 of a short-period fever which was seriously impairing the 

 ,, efficiency of ships' crews in dock. Experiments were also 

 undertaken at Bombay on ridding railway carriages of bed- 

 bugs, at the request of the Bombay Baroda and Central 

 India Railway. 



As arranged by the Hon'ble Member and the Military 

 authorities, the Imperial Pathological Entomologist was 

 directed to resume Surra work and carry out a fly-survey 

 in the Punjab and North- West Frontier Province. He 

 accordingly left Bombay on 25th September 1919 for this 

 work and visited the following places with Messrs. P. G. 

 Patel and S. K. Sen, Assistants, in connection with this 

 survey, viz., Karachi, Jacobabad, Quetta, Lahore, Camp- 

 bellpur, Basal, Jhalar, Nowshera, Attock, Lawrencepur and 

 Peshawar, and many other small villages. In connection 

 with this work also, an abstract of all reports received from 

 Veterinary Officers with regard to Surra and Horse Flies 

 has been sent to the Director, Veterinary Services in India, 

 Simla. 



The Mosquito Campaign on the Pusa Estate was conti- 

 nued throughout the year. 



Mr. P. G. Patel, Entomological Assistant, reports as 

 follows on his work during the year : — 



" From November 1919 to February 1920 observations 

 were made regarding the activity of the parasites of 

 Tabanidae. 



" Tabanid parasites are in the habit of laying their eggs 

 inside the eggs of Tabanus. The egg-laying period of 

 Tabanidae is (1st brood) from February to April, (2nd 

 brood) from June to July, and (3rd brood) from September 

 to October. There are certain species of Tabanus which 

 may be found to lay their eggs either in May or August, 

 but the majority behave *in the manner stated above. 



" Tabanid parasites have been observed during the whole 

 egg-laying period of Tabanidae more or less, but no record 

 seems to have been made regarding the behaviour of Taba- 



