86 Indian Museum Notes. . [Vol. V. 



An emulsion, if properly made, always contains a greater per 

 cent, of kerosine than of other ingredients. This percentage may 

 vary from 60 per cent, to 90 per cent., but experiment has shown 

 that 66 per cent, kerosine will give the most satisfactory results. 



The formula for the preparation of kerosine emulsion recom- 

 mended is as follows : — 



Kerosine . . . . .2 gallons = 67 per cent. 

 Common soap or whale oil soap . § pound ") 

 Water ..... 1 gallon j 33 



Dissolve the soap in the water by heating and add the solution, 

 boiling hot, to the kerosine, and churn the mixture by means of a 

 force pump and spray nozzle for five minutes. The emulsion, if 

 perfect, forms a cream which thickens on cooling and should adhere 

 without oiliness to the surface of glass. Dilute, before using, one 

 part of the emulsion with nine parts of cold water. The above for- 

 mula makes 3 gallons of emulsion, and when diluted gives 30 gallons 

 of wash. 



The mixture is sprayed over the crop and should rid it of B. gibbus 

 and in addition of all soft-bodied mandibulate insects, such as cater- 

 pillars, etc. 



7. Dictyophara pallida, Donov. 



Reference. — Cat. Spec, of Homop. Ins. in Br. Museum, Pt, II, p. 310. Fulgora 



pallida, Donov. Ins. Ind., pi. 8, f. 2. Indian Museum Notes, V. 2, 43. 

 Classification.— Order Hemiptera. Sub-Order Homoptera. Family Fulgoridce. 



Life history and description. — Not very much appears to be 

 known about this insect. Under the name of Pseudaphana pallida 

 it is described shortly and figured in Westwood's Natural History 

 of the insects of India. The description given by Westwood is 

 Donovan's, and, as he states, it is far from concise enough. It is as 

 follows : — 



Trunk linear, ascending ; thorax pale green with red lineations ; 

 wing cases hyaline, length with the wings closed, \ an inch. 



Distribution. — Has been reported from Southern India. It occurs 

 also in Bengal (Donovan). 



Report of attacks in the cane fields. — In January, 1900, the 

 Agriculture Inspector reported that this insect was damaging the 

 sugarcane crop in the North Arcot District, Southern India. He 



wrote : — 



"These insects are seen to perch on the underside of the cane leaf avoiding 

 sun and on shaded leaves. They are good springers. The bug is soft-bodied 



