240 



Jasschke (V. J.). La Garrapata Comiin del Ganado Bovino en la 

 Republica Argentina. [The Common Cattle Tick in the Argentine- 

 Republic] — Anales Soc. Rural Argentina, Buenos Aires, lii, no. 6, 

 June 1918, pp. 346-358. [Received 21st October 1918.] 



In this paper the various stages of the common cattle tick of 

 Argentina [3Iargaroinis {Boophilus) anmdatus microplus] are described 

 and its life-history and habits on the host are discussed. 



Scott (E. W.), Abbott (W. S.) & Dudley, Junr. (J. E.). Results of 

 Experiments with Miscellaneous Substances against Bedbugs,. 

 Cockroaches, Clothes Moths, and Carpet Beetles.^ — U. S. Dept. 

 Agric, Washington, B.C., Bull. no. 707. 26th August 1918, 36 pp. 



Experiments to test the value of various materials as insecticides 

 against Cimex lectularius (bed-bug) were made both in jars and rooms. 

 Trials on a practical scale w^ere made by thoroughly dusting badly 

 infested rooms or beds with the material to be tested, one examination 

 only being made, usually 4 or 7 days after treatment. 



The liquids tested included 27 different hydrocarbon-oil preparations,, 

 composed largely of kerosene and gasoline oils mixed with varying 

 amounts of nitrobenzene, phenols, essential oils, etc., which were 

 found to be very effective against bed-bugs, owing to their power 

 of penetration, killing in most cases 100 per cent, within 48 hours. 

 Coal-tar cresote emulsions were effective, when used undiluted. 

 Mercuric chloride in a 6 per cent, solution and also as a dust was found 

 to kill 100 per cent, of the treated insects within 24 hours. Acetic 

 acid, ammonia water, coal-tar oil (chlorinated), cotton-seed oil, 

 glycerol, kerosene, linseed oil, nicotine, oil of pine needles and turpentine- 

 also proved effective. 



Of dry preparations sabadilla seeds used as dust were very effective, 

 killing from 95 to 100 per cent, in 48 hours. P^Tethrum was also 

 very effective, but pyrethrum stems, and also tobacco powders 

 containing as much as 5 "26 per cent, of nicotine had little or no value. 



Absolutely ineffective substances were : — hellebore, allspice, alum,, 

 angelica root, arsenious acid, borax, boracic acid, chamomile flowers, 

 colocynth pulp, eucalyptus leaves, formaldehyde, lead acetate, Paris 

 green, red pepper, quassia chips, sodium bicarbonate, sodium fluoride, 

 and pastes formed of sugar, water, and starchy material and containing 

 either 1*91 per cent, or 2-21 per cent, of phosphorus. 



Fumigation with sulphur at the rate of 1 lb. to 1,000 cubic feet 

 of room space, was found to kill 100 per cent, of the bugs as well as 

 their eggs. As these are often deposited in inaccessible cracks and 

 holes or behind wall-paper where it is impossible to reach them wdth a 

 dust or spray, this quality of sulphur is very important. 



Kerosene oil was the only substance found to be completely eff ective- 

 against the eggs, but mercuric chloride, though it had no effect on the 

 eggs themselves, immediately killed all the newly-hatched insects. 



The remainder of this bulletin is noticed elsewhere [see this Review,. 

 Ser. A, vi, p. 531]. 



