451 



NELSON C. DA VIS AND RAYMOND C. SHANNON. 



Seasonal INCIDENCE. 



We have the record of pupation and emergence of this species in 

 August, the winter season in Argentina, thiKS indicating that breeding 

 is not in abeyance during the colder months. 



From collections secured at Cañitas on December 18, 1926 (both 

 favorable and unfavorable localities visited), 443 identifications were 

 made, mostly of larvae. Of these, 425 were A. pseudopundipennis, 

 3 A. argyritarsis and 15 of the tarsimaculatus-rondoni group (none of 

 the latter emerged). A one-hour capture with animal bait on the same 

 date gave the following: 37 A. pseudopundipennis, 17 A. rondoni, 15 

 A. tarsimaculatus, 14 A. argyritarsis and about 15 of the Nyssorhynchus 

 group whicíi were mutilated beyond possibility of recognition. 



On January 14, 1927, more larvae were collected at Cañitas, from 

 which emerged 38 A. pseudopundipennis; none of the Nyssorhynchus 

 group were bred out. 



The collections made on March 2, 1927, have already been men- 

 tioned in connection with breeding places. Total emergences from all 

 collections made at Cañitas on that date were as follows: 44 A. pseudo- 

 pundipennis (17 females, 27 males); 87 A. rondoni (38 females, 49 

 males) and 2 A. tarsimaculatus (1 female, 1 male). 



Emergence from collections made in the same neighborhood March 

 19-20, 1926, yielded the following: 61 A. pseudopunctipennis, 30 A. 

 rondoni, 11 A. tarsimaculatus, 8 A. argyritarsis and 1 A. alhitarsis. 



As already mentioned, A. rondoni was found in Calilegua in the 

 month of May. It has been taken in Ledesma in the month of June 

 (1 specimen). 



Captures with animal bait. 



The night capture made December 18, 1926, has already been 

 cited. On that occasion flight commenced at 7:10 p.m. 



On March 7, 1927, flight commenced at 6 :45 p.m. The evening was 

 cloudy and rain began to fall about 7:30. The distribution of species 

 is indicated below : 



