A Revised Synopsis of the Tsetse-Flies. 151 



narrower, and the marginal strise between the coxa3 are more 

 sinuous. 



Hab. Marcopata, Peru. Many examples. 



Pachylopus lepidulus, Br. 



This species has been found in some numbers by Mr. J. J. 

 Walker at Wellington, Westport, Sumner, New Brighton, 

 and Timaru in New Zealand. It has similar habits to those 

 of the European P. maritimusy Sfcepli., and has one curious 

 cliaracter — the club of the antenna is emarginate ati the 

 apex. 



EXPLANATION OF PLATE VI. 



Fiy. 1. Niponius canalicollis, Lew. (Ann. &; Mag. N. H. 1901, viii. p. 370). 



Fig. 2. „ 2)arviduSf Lew. (Eut. Month. Mag. xxix. p. 184, 1893). 



!)'(/. 3. „ Andreicesi, Lew. (t. c. p. 183). 



Fiy. 3 a shows the form of pi'ostenial striae. 



Fiy. 4. Niponius striaticeps, Lew. 



Fiy. 5. Enicosoma vespertinuvi, Lew. 



Fiy. 5 a phows the facial outline. 



Fty. (3. Orcctoscelis humeralis, Lew. (Ann. & Mag. N. II. 1903, xii. 



Fiy. 7. Stenutrophis cavifrons, Lew. {op. cit. 1902, x. p. 233). 



XXII. — A Revised Synopsis of the Tsetse-Flies (^Gemis 

 Giossina, Wied.), with Notes on Glossina tachinoides, 

 Westwood, By Ernest E. Austen. 



In the writer's Monograph *, published last year, seven 

 species of the genus Glossina were recognized and described. 

 As was only to be expected, the increased attention paid to 

 the tsetse-flies of late, due in great measure to the identifica- 

 tion by Colonel David Bruce of one of the species {Glossina 

 jjalpalis, Rob.-Desv.) as the active agent in the dissemination 

 of the dread disease of Tropical Atrica known as Sleeping- 

 Sickness, has led to the collecting of these insects in greater 

 numbers. The result is that it is now possible to form a 

 somewhat clearer view of the different species and their charac- 

 teristics than was feasible at the time that the Monograph 

 was written, when the amount and condition of the material 

 available for examination left much to be desired. The 

 conclusions now arrived at are embodied in the amended 

 synopsis of species printed below. 



* * A Monograph of the Tsetse-Flies [Genus Glossina, Wiedemann] : 

 based on the Collection in the British Museum.' By Ernest Edward 

 Austen. London : Printed by Order of the Trustees. 1903. 



