10 



MacDougall (A. H.). Spraying as a Preventive for Blow-flies. — 



Agric. Gaz. N.S.W., Sydnev, xxxi, no. 9, September 1920, pp. 

 617-618. 



As a result of experiments (which are still in progress) one part of 

 carbolic dip to ten parts of water is recommended for the treatment 

 of sheep infested with blow-flies. The affected part should be shorn 

 fairly closely, and a weaker solution should be used if the flesh is raw. 



Cohen (L.). The Control of Cattle Tick.~Agric. Gaz. N.S.W., Sydney, 

 xxxi, no. 9, September 1920, p. 654. 



It has been thought that arsenic oxide appearing in dips as the result 

 of oxidation of arsenious oxide has less effect on ticks than the original 

 form. The results of experiments carried out in Queensland show that 

 arsenate possesses a tick-killing power of about one-third that of 

 arsenite. Arsenical fluids apparently act more rapidly in summer than 

 in winter, and it is thought that weaker solutions applied at shorter 

 intervals, i.e., a 5 lb. solution with a four-day interval, might be more 

 successful than the present method of an 8 lb. solution at 5 to 10 day 

 intervals. Arsenate up to 0-3 per cent, by itself, or up to 0-2 per cent, 

 combined with 0-1 per cent, of arsenite, has no noticeably injurious 

 effect on cattle. The departmental mixture at full arsenical strength 

 has no deleterious effect on cattle, including dairy cows in full milk, 

 but even at less than half standard arsenical strength it will kill all 

 ticks except those undergoing the second moult at the time of treatment, 

 and these apparently resist all commonly employed concentrations. 

 Emulsion is not essential to the dip fluid, provided a thorough wetting 

 of every part of the animal is ensured. 



Newstead (R.) & Morris (H. M.). Report on the Non-parasitic or Forage 

 Acari of the Family Tyroglyphidae. — Rept. Grain Pests {War) 

 Committee, Royal Society, London, no. 8, 1920, pp. 16-25, 6 plates. 

 [Received 4th November 1920.] 



Certain Acarids frequently found upon domestic animals are 

 non-parasitic, but have accidentally been carried to an animal host 

 owing to their presence in some form of forage on which the animals 

 are fed, or in the dust about beams and ledges of a stable, whence they 

 can easily be transferred to a living host by contact or by flies. These 

 mites are usually harmless, but certain species, when very numerous, 

 may cause considerable irritation. In skin-scrapings from animals they 

 are frequently mistaken for mange Acarids. 



Various records of the occurrence of such mites on animal hosts, 

 reported by previous authors, are quoted. The characteristics differen- 

 tiating mange mites, or Sarcoptids, from forage acari, or Tyroglyphids, 

 are described, and a key is given for the determination of mange mites 

 of the genera Psoroptes, Sarcoptes and Symhiotes and of the forage 

 mites. 



Brief descriptions are given of the following Tyroglyphids : — 

 Tyroglyphus (Aleurobitis) farinae, de G., which is probably the com- 

 monest of the forage Acarids, occurring in meal, bran, maize, wheat, 

 flour, cheese, etc. It is frequently found in skin scrapings from horses, 

 and has also recently been found in the ears of a guinea-pig. Histiogaster 

 entomophagus, Lab., is considered a pest of primaiy importance in 

 connection with the storage of flour and mixed farinaceous foodstuffs. 

 Glyciphagus cadaverum, Schr. , has been found very abundantly in wheat 



