HABITS OF ANOPHELES RONDONI IN ARGENTINE REPUBLIC. 



450 



latus-rondoni group and only 2 were A. pseudopunctipennis. Oí 75 

 emergences from the collection, there were 72 rondoni, 2 pseudo- 

 punctipennis and 1 tarsimaculatus. On the other hand, of 41 emer- 

 gences from a collection made on the same date in the reservoir above- 

 mentioned, there were 39 pseudopunctipennis, 1 rondoni and 1 tarsi- 

 maculatus. 



FiG. 2. 

 A. rondoni. 



Grassy ditch at edge of swamp; a highly favored breeding place of 



On March 31, 1927, the water level in the reservoir and adjoining 

 swamp was f ound to have been lo wered ; the most favorable breeding- 

 place was drained, but 12 rondoni larvae were taken from some remain- 

 ing pools in the swamp. 



On May 5, 1926, in Calilegua, small numbers of A. rondoni and A. 

 argyritarsis larvae were found in pockets of clear water among heavy 

 growths of grass in an overüowed meadow adjoining a cat-tail marsh. 

 On March 30, 1927, in this same meadow, 38 rondoni, 7 tarsimaculatus 

 and 3 argyritarsis larvae were found. The contiguous cat-tail marsh 

 showed green algae and pseudopunctipennis larvae, but no rondoni. 

 On the same date a few rondoni and tarsimaculatus larvae were taken 

 from a puddle in a road near this marsh. 



