﻿IX, B, 5 Walker and Barber: Malaria in the Philippines 423 



Table IV. — The longevity of anophelines in captivity. 



Interval in days between blood meal and dissection. 



Mosquitoes 

 at begin- 

 ning of ex- 

 periment. 



Mosquitoes 

 surviving 

 at date of 

 dissection. 



Mosquitoes 

 that sur- 

 vived and 

 were dis- 

 sected. 



5 



11 



158 



139 



188 



298 



100 



112 



120 



32 



17 



54 



24 



38 



11 



9 

 121 



69 



80 



161 



47 



32 



64 



19 



8 



17 



14 



8 







Per cent. 

 81.8 

 76.5 

 49.6 

 42.5 

 50.6 

 47.0 

 28.5 

 53.3 

 59.3 

 47.0 

 31.4 

 58.3 

 21.0 

 



6 . 



7 



8 . ... . - 



9 



10 



11 



12.. 



13.. 



14 



15 



16 



18 





Total - 



1,302 



639 



49.0 









Therefore, on the average, about one-half of our experimental 

 mosquitoes lived to be dissected. The proportion that lived to 

 the date of dissection, so far as the differential counts of both 

 the females that sucked blood and the females that lived to be 

 dissected were made, show the following distribution among the 

 several species : 



Table V. — Longevity of the several species in captivity. 



Species. 



Females 



that sucked 



blood. 



Females 



alive at 



dissection. 



Females 

 living to be 

 dissected. 



AnopJieles fcbrifer ._ . _. ._ 



398 



219 



Per cent. 

 55.0 

 42.2 

 61.9 

 78.2 

 100.0 



Anopheles rossii . . _ 



523 



221 



23 



2 



221 



137 



18 



2 



Anopheles barbirostris 



Anopheles sinensis 



Anopheles maculatus 



In this table are included all of the mosquitoes that lived to be 

 dissected without reference to the length of time that they 

 survived. The time intervening between the date that the mos- 

 quitoes fed on infected blood and the date they were dissected 

 probably averages nearly equal in the several species. 



