ROLE OF STOMOXYS CALCITRANS. 



503 



able tubes. This test was begun with 90 flies which for three 

 days were applied to a guinea pig having a high degree of 

 infection. On the fourth day the first of a series of monkeys 

 was employed with 87 flies. The monkey host was changed 

 daily as long as any flies remained. Beginning with the twenty- 

 sixth day of the experiment, monkeys were used for 3 successive 

 feedings. The experiment ran its course in forty-two days 

 when the last 2 flies died. No infection resulted up to a period 

 of thirty-eight days, the length of time the experimental animals 

 had been under observation. 



The results are embodied in Tables IX, X, XI, and XII. 



Table IX. — Successive feeding of Stomoxys from infected to healthy 



animals. 



Interval 



after 



feeding on 



infected 



animal. 



No. of 



healthy 



guinea 



pig used. 



Number 

 of flies 

 used. 



Interval 



after 



feeding on 



infected 



animal. 



No. of 



healthy 



guinea 



pig used. 



Number 

 of flies 

 used. 



Days. 







Days. 







i 



53 



11 



35 



105 



6 



1 



55 



14 



36 



106 



6 



2 



56 



13 



37 



107 



6 



3 



58 



12 



38 



108 



6 



4 



60 



11 



39 



109 



6 



5 



62 



12 



40 



110 



e 



6 



19 



19 



41 



111 



6 



7 



64 



9 



42 



112 



6 



8 



67 



9 



43 



113 



6 



9 



69 



9 



44 



114 



6 



10 



70 



9 



45 



115 



6 



11 



72 



9 



46 



116 



5 



12 



74 



9 



47 



117 



5 



13 



76 



8 



48 



118 



5 



14 



78 



8 



49 



119 



5 



15 



80 



7 



50 



120 



5 



16 



82 



7 









17 



84 



6 









18 



86 



6 



51 



121 



5 



19 



88 



6 



52 



122 



5 



20 



89 



6 



53 



123 



5 



21 



91 



6 



54 



124 



5 



22 



92 



6 



55 



125 



5 



23 



93 



6 



56 



126 



4 



24 



94 



6 



57 



127 



4 



25 



95 



6 



58 



128 



4 



26 



96 



6 



59 



129 



3 



27 



97 



6 



60 



130 



3 



28 



98 



6 



61 



131 



3 



29 



99 



6 



62 



131 



3 



30 



100 



6 



63 



131 



2 



31 



101 



6 



64 



131 



2 



32 



102 



6 



65 



131 



2 



33 



103 



6 



66 



131 



1 



34 



104 



6 



67 



131 



1 



