157 



the slightest doubt that the flies were responsible for the clinical 

 conditions among donkeys, mules, etc., to which I referred, although 

 the symptoms of disease produced were not those of the so-called 

 ' Horse-Sickness ' (as occasioned by the trypanosome through the 

 medium of the Tsetse-fly)." It has already been mentioned that in 

 Mauritius, where the species is extremely abundant, Stomoxys nigra 

 is believed to disseminate surra among domestic animals (horses, 

 mules, and cattle),* although as yet no systematic attempt seems to 

 have been made to prove this by experiments. f 



Stomoxys omega, Newstead. 



Annals of Tropical Medicine and Parasitology, Series T.M., Vol. I. 

 No. I. P. 87, Plate III., figs. 2, 3 (February 1, 1907). 



PLATE XIII., FIG. 96 (MALE). 



This very distinct species, which owes its name to the fact that, 

 in front of the transverse suture, the usual dark longitudinal stripes 

 on the dorsum of the thorax are modified so as to form a figure 

 somewhat resembling the Greek O, was described from specimens 

 from the Congo Free State, and has hitherto been received only 

 from West Africa. The localities, etc., of the eight examples (two 

 males and six females) in the Museum are as follows. Sierra Leone, 

 August 12th, 1904, " on window-pane " (Major F. Smith, D.S.O., 

 R.A.M.C.). Ashanti : Obuasi, May 22nd, 1906, July 28th and 

 November 28th, 1907 (the two latter specimens " caught on 



* Cy. Lieut. -Colonel N. Manders, B.A.M.C., " Surra as it occurs in Mauritius " : 

 Journal of the Royal Army Medical Corps, Vol. V., No. 5, pp; 623-626 (November, 

 1905). In this paper the fly is erroneously referred to as "Stomoxys geniculatus, 

 de Bogot." 



f According to Drs. Alexander Edington and John Morton Coutts ("A Note on 

 a Recent Epidemic of Trypanosomiasis at Mauritius ": The Lancet, October 5th, 1907), 

 " enormous numbers " of the trypanosome of this disease are readily found in the 

 stomachs of specimens of Stomoxys nigra in Mauritius, where the fly is known as^the 

 mouche bozuf. The authors in question add that : " M. Daruty de Grandpr6, Curator 

 of the Museum at Mauritius, succeeded in infecting a healthy dog, to which he 

 applied eight flies." No details, however, are given. 



