37 



anolhei gallon of water should be added and the mixture stirred. If 

 the solution does not then clear up, the caustic soda must have been 

 of very low grade and the undissolved substance must be arsenic. 

 To obtain complete solution, put the kettle over the fire, heat nearly, 

 but not quite, to boihng and sbir. As soon as the solution of arsenic 

 is complete, dilute to about 4 U.S. gallons, add the washing soda, and 

 stir until dissolved. After the solution has become cold, add water 

 to make it exactly 5 U.S. gallons, mix well, let it settle, and draw it off 

 into containers which can be tightly corked or otherwise closed. Tin 

 containers must be occasionally inspected for leaks due to the action 

 of the solution on the solder. The chemicals have no effect upon iron. 

 The dilutions at which the various concentrated stocks will be used 

 are as follows : 1 part of boiled arsenic stock, (either high or low 

 strength) added to 19 parts of water ; 1 part of S-B arsenic stock to 

 124 parts water (low-strength) or 99 parts water (high-strength) ; 

 1 part of tar stock to 300 parts of finished bath. As an aid in dealing 

 with the problems of replenishing a bath and of correcting its strength, 

 tables are given which simplify the calculations. Notes on the con- 

 struction of dipping vats and on the safe disposal of waste arsenical 

 baths complete this paper. 



Taylor (F. H.). Contributions to a Knowledge of Australian Culicidae. 



No. 1. — Proc. Linn. Soc. N.S.W., Sydney, xxxix, no. 155, August- 

 October 1914, pp. 454-468, 4 plates. [Received 26th Jan. 1915.] 

 Descriptions of the following Australian Culicidae are given :— 

 Anopheles {Pyretophoms) atratipes, Skuse ; Anopheles {Myzorhynchus) 

 barbirostris, v.d. Wulp ; Anopheles {Nyssorhynchus) annulipes, Walk., 

 from South Australia and Solomon Islands ; Armigeres obturbans, 

 Walk. ; Mucidus alternans, West. ; Stegomyia scutellaris, Walk., being 

 the first record of this species from the mainland of Australia ; S. 

 fasciata, F., and S. pseudoscutellaris, Theo., from Samarai Island, 

 which latter is said to be a transmitter of Filaria ; S. hilli, sp. n., 

 from Melville Island ; Chaetocruiomyia sylvestris, Theo., Ochlerotatus 

 (Sc'domyia) notoscripta, Skuse, and Aedimorphus australis, sp. n., 

 all from Queensland and var. darwini, var. n., from N. Territory ; 

 Macleaya tremula, Theo., from Queensland ; Ochlerotatus (Cidicada) 

 fergusoni, sp. n., from N.S.W. ; 0. victorien'iis, sp. n., from Victoria ; 

 0. australis, Erich., 0. vittiger, Skuse, and 0. flavifrons, Skuse, from 

 N.S.W. ; 0. tasmaniensis, Strick., and O.vandema, Strick., both from 

 Tasmania ; Ochlerotatus (Culicelsa) vigilax, Skuse, 0. alboannulata, 

 Macq., Ciilex biocellatiis, sp. n., C. fatigans, Wied., C. occidentalis, 

 Skuse, and C. tigripes, Grp., all from N.S.W. ; C. sitiens, Wied., from 

 Papua ; Caenocephalus concolor, Tayl., from Tasmania ; Finlaya 

 poicilia, Theo., from Papua ; Skusea bancrofti, sp. n., from Queens- 

 land ; Menolepsis (?) tasmaniensis, sp. n., from Tasmania. 



Graybill (H. W.). Repellents for protecting animals from the attacks 

 of flies.— C/.S. Dept. Agric, Washington, B.C., Bull. no. 131, 

 10th September 1914, 26 pp. [Received 16th February 1915.] 



Various repellents employed in protecting domestic animals from 

 biting flies and from flies ^vith parasitic larvae, are described and ex- 

 periments recorded. The repellent action of certain colours is men- 

 tioned : hght-coloured animals suffer less from flies than dark-coloured 



