107 



in diameter, and long enough to reach from the top to the bottom of 

 the bulk of grain. Punch the joints out of the bamboo, so ai to be abl« 

 to pass a stick through from one end of the bomboo to the other. Have 

 the stick made to fit the cavity in the bamboo. Pass the bamboo with 

 the stick in it, down through the bulk of gain from the top to the 

 bottom. Withdraw the stick, and drop into the top of the bamboo 

 about half a teaspoon of naphthaline powder. The bamboo can then be 

 drawn out, as the naphthaline is safe at the bottom of the bulk of grain. 

 If the bulks are large this should be done once to every 10 feet square 

 of the bulk. Eepeat the application every 15 or 20 days as the powder 

 evaporates. 



" The weevils that can leave the grain will do so, and those that can- 

 not leave are killed by the odour of the naphthaline. I do not believe 

 that naphthaline thus used can cause any injury whatever to grain. 

 For seed purposes the germinating powers appear not to be affected in 

 the least. For marketable grain the colour is not affected, and the 

 odour will leave in a short time if fresh naphthaline is not applied to 

 it. The quantity of powder used is infinitely small in proportion to the 

 quantity of grain, and the powder is entirely destroyed by evaporation, 

 so that for food purposes the effect is nil." 



COCCID^ OR SCALE INSECTS— XIII, 



By T. D. A. CocKERELL, Entomologist of the New Mexico Agricultura 



Experiment Station. 



The following species and varieties have been added to the West In- 

 diana fauna since the groups to which they belong were discussed in the 

 present series of Articles. 



(12a.) Margarodes formicarum, var. rileyi, Giard, 1897. (Riley's 

 Ground Pearl.) On the shore at Port Royal are washed up 

 quantities of smaU pearl-like objects, of a beautiful golden-brown 

 colour. These are the shells of a species of Margarodes, which 

 M. Giard has named as above. The same insect has been found 

 in quantity at Largo Key, Florida, by Mr. W. T. Swingle. I 

 am by no means certain that this insect is an inhabitant of 

 Jamaica, as it is well known that seeds from Trinidad can be 

 found in the drift outside of Kingston harbour, and there is no 

 telling whence the Mangarodes shells may have floated. 



(86.) Rhi%(BCU8 eloti, Giard, 1897. (Elot's mealy-bug). 



This is a small mealy-bug, 2 mm. long, which infests the roots 

 of coffee trees in Guadeloupe. It is of a greyish colour, with 

 more or less of the usual cottony secretion. M. Giard's speci- 

 mens were found by M. Auguste Elot The genus JRhizcectis was 

 established by Kiinckel d'Herculais in 1878 for a species {R.fal- 

 cifer) found on the roots of an Australian palm ; it resembles 



