106 



are used, and invasions by mice, cockroaclies and ants provided 

 against. The adults are carried to the liberating stations, pre- 

 ferably in the early morning or evening, and stained in rect- 

 angular screen cages. Phenolphthalein or aqueous solutions of 

 eosin, fuchsin, bismarck-brown, gentian- violet or methylene-blue 

 ■^ere converted into a very fine spray through a vaseline-nebu- 

 liser, or a fine atomiser, and this spray is allowed to fall upon the 

 mosquitos. The idea is not to encrust the mosquito, which is 

 fatal, but only to place minute specks on the body. Staining 

 should be performed only in the evening, and two hours before 

 releasing the insects, in order to dry the stain thoroughly. As 

 dark-coloured clothing is attractive to the mosquitos it is important 

 to wear a light suit and to observe the clothing and habits of 

 passing people. 



The mosquitos found in buildings are best recovered by hand, 

 and elsewhere traps (such as that designed by Mr. C. H. Bath), 

 beating nets, or tents are used. The adults recovered are killed 

 with sulphur dioxide in a closed chamber and placed in pill- 

 boxes with an exact record of the number, species, locality, 

 temperature, humidity, wind-direction and velocity, cloudiness, 

 smoke, &c. The contents of these pill-boxes are wetted in the 

 laboratory with a solution containing three parts of glycerine, 

 three of alcohol and one of chloroform. The observer, who must 

 be free from amnesic or general colour-blindness must confirm all 

 colours recovered by a spectroscope. It is thus possible to work 

 out most exact correlation charts, if all the precautions men- 

 tioned be observed. 



SuRCOUF (J.). La transmission du ver macaque par un moustique. 

 [The transmission of Dermatohia cyaniventris by a mosquito.] 

 —C.E. hehd. Acad. Sci., Paris, clvi, no. 18, 5th May 1913, 

 pp. 1406-1408, 2 figs. 



In spite of the frequent occurrence of tumours caused by the 

 larvae of Dermatohia cyaniventris, Macq., in tropical America, 

 their presence as subcutaneous parasites of man and other mam- 

 mals has so far not been satisfactorily explained. In 1900, 

 Prof. R. Blanchard had observed large eggs arranged in packets 

 on the ventral side of the abdomen of certain Central American 

 mosquitos ; and Dr. Morales, of Costa Eica, asserted (1910) that 

 the eggs of Dermatohia were laid directly on the abdomen of the 

 mosquito, which then transported the larvae to the vertebrates; 

 but it seemed incredible that Dermatohia, which is of the size 

 of a blue-bottle (Calliphora erythrocejihala) , should be able to- 

 oviposit on the mosquito itself. In 1912, Dr. Nunez Tovar, of 

 Maturin (Venezuela), succeeded in producing tumours, which 

 after eleven days were found to contain larvae of Dermatohia, by 

 placing specimens of the blood-sucking mosquitos Jantliinosoma 

 lutzi, Theo., carrying Dermatohia eggs, on various animals. 

 The ' author received egg-carrying Janthinosoma from Dr. 

 Gonzalez Eincones, of Caracas, who discovered that Derma- 

 tohia oviposits on leaves in damp places frequented by that 

 mosquito. An examination of the eggs showed that they were 



