Volume s1-15, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



  • 1.  In two separate experiments, females were infected with . In one experiment, 3 out of 7 were infected with oöcysts, and all of the 5 controls were found to be positive. In the other experiment, 3 out of 11 females were infected with either oöcysts or sporozoites; while approximately 94 oöcysts were found in the stomach wall of the single control.
  • 2.  Sporozoites were found in one of the positive nine days after the infective blood meal.
  • 3.  Mosquitoes that quite probably were were also infected with . Two out of 13 of these mosquitoes had oöcysts in the stomach wall, while 7 of the 14 controls were positive.
  • 4.  Not only were more individuals of refractory to infection, but it appeared that those mosquitoes which didbecome infected displayed a higher degree of immunity than .
  • 5.  larvae in Panama are found chiefly in . In a limited area that was under observation for over four months, a certain patch of seemed to be more attractive to ovipositing females than other patches, and this appeared to be true even as regards certain areas within a single patch.
  • 6.  females have been observed to attack man in the jungle by daylight.


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  • Received : 11 Jun 1935
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