ENTOMOLOGY

282 SANITARY ENTOMOLOGYpools he fitted a parachute to the bottle and shot it with a bow gun,using rubber bands for power.A rtificial Con~ainers of Mosquito Larva:In mosquito work much attention must be given to all types ofartificial water containers, as rain barrels, cisterns, latrines, tin candumps, garbage cans, gutters, water pitchers, flower vases, aquaria,table isolation receptacles in tropjcal countries, cesspools, sewers, toiletsand flushing boxes" traps in sinks, drinking fountains, water troughs,etc. Flushing, periodic emptying, covering with pil film, stocking withfish, are among the possible 'expedients available in one or another ofthe cases. Capt. D. L. Van Dine and Dr. W. V. King have devised a newtreatment for water in fire barrels and water tanks for storage ofwater to be used in cleansing cans, in each of which cases oil is veryundesirable. These receptacles may be treated with borax at the rateof lh pound to 10 gallons of water; or with 1 pound of salt to 10 gallonsof water.Fish as Mosquito ControlAmong the principal natural enemies of mosquitoes are flsh and inpermanent ponds and lakes and streams, the stocking with the properspecies of fish may be considered as one of the most satisfactory methodsof mosquito control. In this country top m~nnows and goldfish arecommonly used for this purpose. The Bureau of Fisheries lists the followingfresh water fish available for introduction in American watersinfested by mosquitoes: 'l'he killifishes, Fundulus diaphanus, F. dispar, F.n9tatus, F. chrysotus, and F. nottii; the top minnow, Gambusia affinis;Heterandria formosa, Mollienisia latipinna, ErliTUJacanthus obesus, E.gloriosus, M esogoniatius chaetodon, Centrarchus macropterus, Lepomiscyanellus, L. gibbosus, Elassoma zona tum, Notemigonus crysoleucas,Labidesthes sicculus, and CarassiuB auratus (goldfish). (Radcliffe 1915.)For use in salt water or brackish witter the following fishes are available:Fundulus majalis, F. heterocliteus, F. similis, Lucania parva, L.'tJtfflusta, and Cyprinodon 'tJariegatus. (Radcliffe.)The most complete summary of the species of fish available in variousparts of the world is given by Hegh (pp. 140-150). Howard, Dyar andKnab and also Le Prince and Orenstein discuss the subject. The methodsused in distributing fish in various types of water in India are describedby Wilson (1917).In this country anyone desiring to stock a reservoir or other bodyof water with fish should immediately communicate ,vith the Bureau ofFisheries at Washington.The Panama larvicide and creosote arc toxic to fishes, and