INSTITUTE, PUSA, FOR 1917-18 117 



REPORT OF THE IMPERIAL PATHOLOGICAL 



ENTOMOLOGIST. 



(F. M. HOWLETT.) 



I. Introduction. 



I was in charge of the Section for 10 months of the year, 

 from August 28, 1917, when I returned from military duty 

 in England. From 1st July to 27th August, 1917, Mr. T. 

 Bainbrigge Fletcher, Imperial Entomologist, was in charge 

 of this Section in addition to his own duties. 



The greater part of the work of the Section during this 

 period may be put under four main heads, work under each 

 head being done chiefly by the officers named against each : — 



(1) Mr. P. G. Patel. Observations on the life-histories 



and habits of blood-sucking and saprozoic 

 insects. 



(2) Mr. H. N. Sharma and the Imperial Pathological 



Entomologist, with M. Shaffi and M. Karim. 

 Experimental and practical work on mosquitos. 



(3) Mr. S. K. Sen and the Imperial Pathological Ento- 



mologist. Experimental work on insect psycho- 

 logy in relation to feeding and oviposition. 



(4) The Imperial Pathological Entomologist. Experi- 



mental and practical work on insect-repellants 

 and insecticides. 



II. Blood-sucking and Saprozoic Insects, 



Attention was chiefly directed to the comparative 

 study of the habits of the larvae of Tabanidae, which show 

 marked and interesting differences in the various species, 

 and to working out the life-histories of the Pusa midges 

 (genera Culicoides and Ceratopogon), a group of minute 

 blood-sucking insects of which very little is known. The 

 main features of several of these life-histories have been 

 ascertained and illustrative coloured plates prepared, the 



