Scale and other Parasitical Insects. 305 



all trees or leaves alike, but seems more generally 

 present on such as are suffering from other causes. The 

 better kinds of grafted mangoes, which are hardly ever 

 so vigorous as the common kinds, seem to suffer most 

 from this scale. As soon as it is seen, no time should be 

 lost in removing it. Where the fruit is attacked, decay 

 soon sets in, but where the invasion is on a limited scale 

 this may be prevented by carefully brushing the colonies 

 off. 



Chionaspis citri, — This coccid, not unlike the pre- 

 ceding one in size and colour, is the pest of the 

 Orange family here — limes, citrons, oranges and bhal, 

 being alike attacked by it. Sometimes the branches 

 and stems of the trees become absolutely white by the 

 great numbers of the inse6ls present, to whose attack 

 after a time the trees are certain to succumb if they be not 

 washed off. 



Ceroplastes vinsoni. A white waxen looking scale, 

 more or less orbicular in shape, with a somewhat irregu- 

 lar outline of slight proje6lions. This inse6l more espe- 

 cially attacks ferns, though many genera appear to enjoy 

 entire immunity from it. So far as has been observed 

 here, it does not affeft more than six species, which too 

 are limited to the genera Adiantu7n and Polypodium. 

 Since it was examined, another coccid, identified as of the 

 same genus, has been found on the native " Long John 

 Tree" (Triplaris surinamensis) — This is probably quite 

 a distin6l species, of which I forbear to say more till the 

 specimens forwarded for investigation have been defi- 

 nitely determined. 



Vinsonia stellifera, — A very beautiful scale, looking 

 like a minute starfish, by which form it may be very 



