453 



NELSON C. DAVIS AND RAYMOND C. SHANNON. 



Captures in six houses at the same settlement on March 20, 1926, 

 gave 279 pseudopu7ictipennis and 15 rondoni, or 5.1 per cent, of the 

 total. 



On March 28, 1927, only 9 rondoni were found in five houses; the 

 pseudopundipennis were not counted. On April 18, 10 rondoni were 

 taken in these houses. On June 1, five houses were visited in Cahitas; 

 these yielded 44 pseudopundipennis, but no rondoni. Most of the 

 dwellings at Cañitas are about a half-mile from the heavy breeding 

 places of A. rondoni. 



In the course of routine house visits at the village of Ledesma, only 

 three A. rondoni have been taken in seven months (December, 1926 to 

 June, 1927, inclusive), one in each of the months of April, May and 

 June. 



Among a total of approximately 200 rondoni collected in houses at 

 Cañitas during 1926 and 1927, there has been noted only one male. In 

 the same collections only two tarsimaculatus and two albitarsis have 

 been found. 



DiSSECTIONS OF MOSQUITOES CAUGHT IN HOUSES. 



From the house captures of December, 1926, dissections were made 

 asfollows: A. pseudopundipennis, 37 stomachs, 35 glands; A. rondoni, 

 1 (stomach and glands). These were all negative. Since the malaria 

 season had not yet begun, for statistical purposes we may ignore these 

 early dissections. 



Thé mosquitoes whose dissections are noted in the following table 

 were captured in March, 1927, except for 8 rondoni and 2 albitarsis 

 which were taken April 18. 



Attempts to segure laboratory infections. 



These experiments may be summarized as folio ws : 

 Experiment I. March 5, 1927. Fed batch of mixed mosquitoes on case of 

 quartan malaria. This patient had taken no quinina. The blood was examined 

 on two successive days to make sure of the presence of gametocytes. March 12, 

 Dissected all of batch: 9 A. rondoni, 3 A. pseudopunctipennis, 1 A. tarsimaculatus, 

 — all negative. 



