REPORT ON GLOSSINA IN NYxVSALAND. 



61 



The flies released at Chunzi were marked by snipping off the first right foot through 

 the middle of the metatarsus, an injury unlikely to occur in nature, and those released 

 at the second spot were marked by snipping through the second foot on the same 

 side. Their fitness seemed to be little impaired by the operation, for test specimens 

 fed on a goat with avidity a few minutes after it, and it is usual to be much assailed 

 by such flies immediately they are released. 



By 7th December, 270 males and 29 females had been released at Chunzi, and 

 on this date on proceeding in the direction of Lingadzi I recaptured one, a male, 

 half a mile away. Two days later 379 males and 57 females had been released at the 

 same place, and two males were then recaptured 2 miles to the south in the direction 

 of the same fly area. 



Table I. 

 Showing Numbers of Tsetses released and recaptured later. 



Releases. 



Recaptures. 



Date. 



Locality. 



S 



? 



Total. 



Place of 

 recapture. 



c^ 



? 



Where released. 



4 Dec. 



Chunzi 



73 



11 



84 











7 - 



j> 



76 



6 



82 











>> 



121 



12 



133 



1 mile S. of 



1 





Chunzi. 













Chunzi 









8 „ 



>> 



47 



13 



60 











9 „ 



»> 



62 



15 



77 



2 miles S. 

 of Chunzi. 



2 





Chunzi. 



10 „ 



Lipimbi 



38 



9 



47 











11 „ 



>> 



97 





97 











12 „ 



»> 



126 





126 



Lingadzi . . 



2 





One at Chunzi, the 

 other near Lipimbi 

 R. 



14 „ 



>> 



76 



. — 



76 



Lingadzi . . 



1 





Near Lipimbi R. 



15 „ 



>j 



138 





138 



Lingadzi . . 



3 





>» »> 



16 „ 



»j 



— 







Lingadzi . . 



2 





j» »» 



17 „ 



j> 



— 







Lingadzi . . 



1 





>» »» 



22 „ 



jj 









Lingadzi . . 



2 





>» »» 



Totals 



854 



66 



920 





14 







On 10th December I commenced to release flies at the second spot south of the 

 Lipimbi, where by 12th December 261 male and 9 female flies had been set free. 

 On this date one of the males was retaken at Lingadzi at the same time with another 

 male which had been set free at Chunzi on a date between the 4th and 9th. By the 

 14th, 337 males and 9 females had been released at this place, and another male 

 originally released here was on this date taken at Lingadzi. On 15th December, 138 

 additional males were released and 3 more were retaken at Lingadzi, where also 

 on the 16th 2 more males, on the 17th 1 more male, and on the 22nd 2 more males, 

 were recaptured. Evidence has therefore been obtained of ten flights of 5 miles and 

 of one flight of no less than 10 miles back to the locality from which the flies were 



