288 Philippine Journal of Science 



Molauin Creek, a rapid mountain stream, dividing the campus 

 of the College of Agriculture, lies northwest by north of the 

 point where the first swarms of Anopheline mosquitoes were 

 seen. It is not more than 150 meters away, and is separated 

 by a moderately thick grove containing many bamboos. The 

 strong breeze mentioned is the daily tail end of the southeast 

 monsoon of this time of the year in this locality; these facts 

 might be adduced to show that neither the intervening woods 

 nor the strong breezes would keep the mosquitoes from invading 

 the college buildings as well as the houses higher up the hill, 

 all of which lie to the windward of their breeding places. 



Malaria is most prevalent in this locality during the dry 

 season; the creek furnishes an ideal breeding place for My- 

 zomyia febrifera Banks during the entire dry period, and 

 the range of activities of this pernicious little mosquito would, 

 if it have the same powers of flight as M. rossii, appear to be 

 limited only by two factors, gamete carriers and the number 

 of individuals exposed. 



