REPORT 



OF THE 



E NTOMOLOGIC A L S ECT I ON 



OP THE 



WELLCOME TROPICAL RESEARCH LABORATORIES 



HAEOLD H. KING 



Member of the Association of Economic Biologists 

 Govermuent Entomologist, Anglo-Egyptian Sudan 



Inteoduction 



This report deals with work accomplished since February 14, 1909, on which date 

 I arrived at Haifa on my way back from leave. Thence I proceeded to Zeidab to spend a 

 week in investigating the causes of an outbreak of malaria among the natives on and in 

 the neighbourhood of the estate belonging to the Sudan Plantation Syndicate, Ltd. On 

 April 17, I left Khartoum for Gondokoro, on the s.s. Gidex with the floating laboratory 

 in tow, and from there worked down stream as carefully as time would permit, collecting 

 blood-sucking insects and ticks and endeavouring to obtain some knowledge of their 

 life histories, arriving in Khartoum on July 19. Eighteen days later, I started for Khor 

 Arbat, Eed Sea Province, to obtain living specimens of the fish Cyprinodon dixpar which 

 it was hoped would prove of value in the control of mosquitoes by devouring their larvae, 

 and, on September 19, went to Zeidab to place these fish in a gudwal on the estate 

 of the Sudan Plantation Syndicate, Ltd. 



On October 19, I proceeded to England on leave, and three days after my return, 

 on January 23, 1910, started for Dongola Province to investigate an attack of cutworms — 

 larvae of Ayrotis ypsilon, Eott. — on the basin cultivations at Nuri and Gureir. On my way 

 back, at the end of February, I stopped at Berber in consequence of a plague of " Asal fly " — 

 Aphis soryhi, Theob. — on seluka dura, and at El-Damer for the purpose of overhauling the 

 spraying machines, etc., stored there for use against locusts. On February 27, I again went 

 to Berber and from there to Zeidab, and on April 5, started for Khor Arbat to obtain 

 more Gijprinodon dUpar, returning to Khartoum ten days later. 



On April 28, I left for Dongola Province with a view to ascertaining whether it would 

 be possible to lessen the numbers of " Nimitti " — Simulium griseicollis, Becker — which 



