8 Indian Insect Fests, [Vol. I. 



of the water to one of the emulsion, it will kill most insects without injury to the 

 plant." 



It should be applied through a spray nozzle (see pi, 4, fig, 4) — 

 *' The nozzle which best combines the necessary qualities is undoubtedly the eddy 

 or cyclone nozzle, consisting of a small circular chamber with two flat sides, one of 

 them screwed on, so as to be readily removed. Its principal feature consists in the 

 inlet, through which the liquid is forced, being bored tangentially through its wall, so 

 as to cause a rapid whirling or centrifugal motion of the liquid, which issues in a 

 funnel-shaped spray through the central outlet in the adjustable cap. The breadth or 

 height, fineness or coarseness, of the spray, depends on certain details in the propor- 

 tions of the parts, and specially in the central outlet. 



" To drive the liquid through the nozzle some kind of force-pump is required, and 

 a great number have at different times been experimented with, some of them being of 

 a most complicated nature. It is perhaps not of any very great consequence which 

 particular form is adopted for use in India ; but the aquapult force-pump, which has 

 been arranged to be worked entirely by one man, who also distributes the spray, seems 

 to be about the best suited for general use in a country where economy in labour is 

 generally not so great an object as economy in the cost of apparatus." 



Lecanium acuminatum^ Sign. 

 Ann. Soe. Ent. France, p, 397, t. 12, £. 1 (1873). 



Plate I, Jiff. 3, c, shows the ventral surface {after Signoret); Jig. 3 a, the dorsal 

 surface, and Jig. 3h,a side view, the two latter magnified about 7 times. 



This eoccid was reported by Signoret as occurring on orchids in the 



conservatories of the Luxembourg. It has since been found on the 



mango in Ceylon by Mr, E, E. Green, and has been identified by Mr. 



Douglas with the species described by Signoret. Only the adult form 



has been found, which is thus described-^ 



Body briefly oval, acuminate towards the apex, rounded, very broad towards the 

 extremity : antennae 7-jointed, fourth longest, third equal to the fifth and sixth taken 

 together, which are the shortest, the seventh as long as the fifth and sixth taken 

 together. Feet broad, flattened ; tarsi short, hardly half the length of the tibise. Dif- 

 fers from X. hesperidum in the form of the body and the shortness of the tarsi : the 

 embryo, too, is oval, rounded, and very broad where the abdomen commences. 

 Long., 2-3 millimetres. 



This eoccid is reported by Mr. Green to do some damage to the m ang 

 leaves which wither and fall off when attacked. 



