HABITS OF ANOPHELES RONDONI IN ARGENTINE REPUBLIC. 452 



On March 19, 1926, the flight commenced at approximately 6:30 

 p.M. The species distribution was as follows : 



Although there is a variation between the two captures just tab- 

 ulated as to the appearance of rondoni and tarsimaculatus, the data 

 are in agreement that the two species appear shghtly in advance of 

 pseudopunctipe7inís. 



On March 28, 1927, a capture was made in which A. pseudopundi- 

 pennis was ignored. In a period of one hour some 20 A. tarsimaculatus 

 and 15 A. rondoni were taken. On March 31, between 6 and 7:30 

 P.M., 50 rondoni were taken on a horse; pseudopundipennis was 

 ignored, and very^few tarsimaculatus or argyritarsis appeared. The 

 evening was cool and drizzKng. On April 18 another one-hour evening 

 capture was made in which 18 pseudopunctipennis and 8 rondoni were 

 secured; no tarsimaculatus appeared. On none of the latter occasions 

 was the exact time noted when flight commenced. 



In all of the foregoing captures the stand was at the same location, 

 namely, near the dam at Cañitas. All five species were breeding in 

 the immediate neighborhood, although larvae of albitarsis were rare 

 and those of argyritarsis not very abundant. 



At Calilegua on May 5, 1926, 120 rondoni were taken on a horse 

 between 5 :30 and 6 :30 in the evening. No other species of Anopheline 

 appeared. Flight commenced while it was yet quite light. The stand 

 was near the marsh previousl}^ mentioned. 



HOUSE CAPTURES. 



Captures in three houses at Canitas Vieja on December 18, 1926, 

 yielded 239 pseudopunctipennis and 7 rondoni, or 2.8 per cent, of the 

 total. 



House captures at Cañitas on March 2, 3, 4, 5 and 7, 1927, gave 

 629 A. pseudopunctipennis, 1 A. tarsimaculatus and 96 A. rondoni, or 

 13.4 per cent, of the total. The exact number of houses visited was 

 not noted. 



