23 



Bachmann (A.) . Programa de Liicha para Llevarse a Cabo en FamailU 

 contra los Anofeles y sus Larvas. [Programme of Work to elimi- 

 nate Anopheline Mosquitos and their Larvae at Famailla.] — 

 Anales Dept. Nac. Higiene, Buenos Aires, xxvii, no. 3, May- 

 June 1921, pp. 117-137, 8 figs. [Received 23rd November 1921.1 



Most of the information in this paper has been recently noticed from 

 another somxe [R. A.E., B, x, 13]. 



As chronic cases of malaria abound, it is clear that dwellings are 

 dangerous foci of infection, and they should be fumigated periodically 

 in order to destroy the adult mosquitos. A mixture of pitch and saw- 

 dust is a simple but effective fumigant. This may be used three times 

 a month in summer, twice a month in autumn, and once a month in 

 winter, but these times should be modified in accordance with the 

 prevailing temperature, as the malarial parasite develops in 10-12 

 days at 77° F. (25° C), but requires almost double the time at 68° F. 

 (20° C.) and does not develop under 59° F. (15° C). 



Some aquatic plants, such as Myriophyllum hrasiliense, Lemna, 

 and Pistia siratioies, appear to be avoided by mosquito larvae. On 

 one estate M. hrasiliense is being planted along the streams at points 

 where breeding-places have been cleared away. 



Saneamiento antipaludico en la Zona del Canal de la Cuarteada (Stgo. 

 del Estero). [Anti-malarial Drainage in the Zone of the Cuarteada 

 Canal in the Province of Santiago del Estero.] — Anales Dept. 

 Nac. Higiene, Buenos Aires, xxvii, no. 3, May-June 1921, 

 pp. 157-163, 3 plates, 1 map. [Received 23rd November 1921.] 



This article describes the drainage and reclamation works on an 

 old branch of the canal. Rain-water and filtration from the present 

 irrigation canal had formed a tract of stagnant water about If miles 

 long, 150 feet wide and 6 feet deep. Oiling, the supply of mosquito- 

 nets and quinine, and the planting of 1,500 poplars and Eiicalypius 

 supplemented the main work. 



Seguy (E.). Les Dipteres qui vivent au Depens des Escargots. 



[Diptera that live on Snails.] — Bull. Soc. Ent. France, Paris, 

 1921, no. 16, 26th October 1921, pp. 238-239. 



In addition to the cases previously recorded of certain Diptera that 

 are parasitic upon snails [R. A.E., B, viii, 24 ; A, viii, 472], the follow- 

 ing all live, at some period of their development, at the expense of the 

 snail. Helix aspersa : — The larvae of Musca domestica, L., may be 

 parasitic, though recent attempts to rear them on Helix have all been 

 negative. Larvae of Sarcophaga melanura, Meig., attack the mollusc 

 in much the same way as those of M. domestica, but destroy it more 

 rapidly. A slug. Avion fuscus, infested with several of these small 

 larvae died two days after it was first observed, and decomposed 

 into a liquid almost immediately afterwards, the decomposition being 

 accelerated by the development of the larvae. Pupation occurred on 

 the tenth day after the death of the host, and eight days later the 

 adults emerged. S. carnaria, Meig., is an occasional parasite of 

 H. aspersa and destroys it in the same manner. S. soror, Rond., was 

 found parasitic in the same snail as S. melanura and S. carnaria. 



To the flies mentioned as capable of developing in the dead bodies 

 of snails must be added Calliphora erythrocephala, Meig., Phora giraudi. 

 Egg., Muscina stahulans. Fall., which may be a true parasite, Fannia 



