﻿72 DR. J. W. SCOTT MACFIE EXPERIMENTS AND OBSERVATIONS 



UPON GLOSSINA PALPALIS. 



throughout the experiments. In the case of green however, after an hour's 

 exposure the fly was showing evident signs of distress, and by continuing the 

 experiment for a further 18 minutes he was killed. The details of this experi- 

 ment were : — 



Male G. palpalis, unfed, in jar shaded by an apple green cover. 

 No water. Temp, of air — 32° 0. 

 C. Fly introduced. Active. 

 Fly active. 



Do. 

 Fly quiet on floor. 

 Do. 

 Do. 

 Fly fell over on to his back, but got up again at once 



when the jar was gently shaken. 

 Fly quiet on floor. 

 Hardly able to stand. 



Fly " as if dead." Slight movements of the pro- 

 boscis only. 

 2.33 T. 41 These movements ceased. Proboscis depressed. Fly 



removed to a box at the temperature of the 

 external air, but he was dead. 

 Bearing in mind the rapidly fatal result of exposure to direct sunlight, it is rather 

 remarkable that in the semi-darkness of the jars shaded by thick brown paper a 

 temperature of 40°-41° C. should have had a more serious effect on the tsetse- 

 flies than in jars shaded by the various coloured papers. In one typical 

 experiment with a fly in a jar shaded by thick brown paper signs of distress were 

 noticed after 35 minutes, and the fly was dead after a further exposure of 

 25 minutes. 



Zungeru, January, 1912. 



1.15 p.m. 



T. 41° 



L.30 



T. 41 



1.45 



T. 40 



2.0 



T. 40-5 



2.5 



T. 41 



2.10 



T. 41 



2.15 



T. 41 



2.20 



T. 41 



2.25 



T. 41 



2.30 



T. 40-8 



