496 



Col. Sir D. Bruce and others. 



[June 15, 



The above table shows that out of the original 183 flies examined, 52 

 (28 per cent.) contained blood which was recent enough to show the red 

 corpuscles. Out of these 52, 7 (13 per cent.) were from mammalian blood, 

 whilst non-mammalian blood was present in 35 flies (67 per cent.). Try- 

 panosomes were present in 14 flies (27 per cent.) and Halteridia in 5 (nearly 

 10 per cent.). One contained a trypanoplasma, derived, probably, from bird's 

 blood. 



An attempt was made to separate the nucleated red blood corpuscles into 

 avian and reptilian. The distinction was made by size only, it being found 

 from the measurement of corpuscles from birds and reptiles that the average 

 normal length was : — 



Standard amphibian (crocodile), 15'4 microns. 

 Standard avian (horn-bill), 13'1 microns. 



In examining the smears from the flies, the average was taken of 10 to 

 20 red cells, which seemed as natural as possible, and the average obtained in 



Table IV. — Shows the Average Measurements of the Nucleated Eed 

 Corpuscles and their Probable Origin. 



No. 



Average length of 

 red cells, 

 iu microns. 



Probably reptilian 

 or amphibian. 



Probably avian. 



1 



15 -3 



+ 





2 



14 -2 



+ 





3 



14-1 



+ 





4 



13 -3 





+ 



5 



14 -4 



+ 





fj 



14-0 



+ 





7 



14-0 



+ 





8 



14 -4 



+ 





9 



14 -5 



+ 





10 



13 -0 





+ 



H 



14 -8 



+ 





12 



14 -4 



+ 





13 



10 -0 





+ 



14 



r,i -4 





+ 



15 



14 0 



+ 





16 



13 -2 





+ 



17 



14 -0 



+ 





18 



15-2 



+ 





19 



13 -2 





+ 



20 



13 -3 





+ 





Totah 



13 



7 



TtemarJcu. — Only 20 of tlie flies contained nucleated l)lood wbicli was recent enougli to justify 

 any deduction as to its origin. Out of tliese 20 llies, 13 liad probably fed on a reptile or 

 ani|iliil)i(iM, and 7 on a bird. 



