104 JOURNAL OP ECONOMIC ENTOMOLOGY [Vol. 3 



Scientific Notes 



Gypsy Moth at Wallingford, Conn. — A serious infestation of the gypsy 

 moth was discovered at Wallingford, Connecticut, about twelve miles north 

 of New Haven, during December. Up to the time of this writing nearly 

 6,000 egg-masses had been found and destroyed by soalting them with creo- 

 sote oil. The center of the infestation is in the village, and while the limits 

 have not yet been determined it is hoped that the pest has not spread to the 

 surrounding country. 



The suppression work will be conducted vigorously under the supervision 

 of the State Entomologist, and if possible the pest will be exterminated from 

 this locality, which is the farthest point westward where this insect is linown 

 to occur. 



Heretofore the only known infested locality in Connecticut was Stonington, 

 where, after four seasons' work, the pest has been nearly exterminated. 



W. E. B. 



Carbon Tetrachloride vs. Carbon Bi-sulphide. — Several serious disad- 

 vantages attend the use of carbon bi-sulphide as a fumigant when used in 

 buildings for the control of pests of grain products or natural history col- 

 lections, particularly its inflammable character, disgusting and irritating 

 odor, and diagreeable residuum. Last year I experimented with the tetra- 

 chloride of carbon, using larvae of Attagenus as subjects, and found it much 

 more agreeable to use and reasonably effective. On my recommendation 

 several others have tried it with satisfactory results. 



In tight cases it should be used at a strength of 45 to 50 cc. per cubic foot. 

 For the standard museum case, 16 x 19 x 3 inches, 15 to 20 cc. is sufficient 

 if the case shuts tightly. For large cases a strength of one quart to 50 

 cubic feet is desirable — practically twice that of carbon bi-sulphide, of which 

 a pint to 50 cubic feet is sufficient.^ 



Carbon tetrachloride is a clear, volatile, heavy liquid with a specific grav- 

 ity of about 1.6. It is non-inflammable, and its odor on evaporation is 

 scarcely noticed where that of bi-sulpliide would be intensely disagreeable. 

 It is very useful as a solvent of oils, rubber, etc., agreeably replacing gaso- 

 line or naphtha for removing grease from clotliing or insect specimens with- 

 out injury to color. ("Carbon," etc.) When purchased at retail the price 

 ranges about 30 or 40 cents per pound, but in quantity it may be had for 

 about one third as much. 



Albert P. Morse, WcUesleij, Mass. 



' 1 am aware that this amount of carbon bisulphide is much greater than is generally 

 stated to be necessary, but a strength of one pound to 1,000 cubic feet of space has not 

 proved satisfactory for museum pests, the above proportions being found necessary in the 

 experiments referred to above. 



