Biological Researches 



amongst the Argentine Bees with special reference to flowers 



they Visit. 



By 



A. C. J ensen-H aarup, 



Silkeborg, Denmark. 



Before going into the real object of this paper, I should 

 like to make use of this opportunity to ihank Dr. H. Friese 

 of Schwerin i./xM. for his kind assistance with the determi- 

 nation of the species of bees collected in West Argentina, 

 partly during my first trip (1904—05) and partly during the 

 second (1906—07), which latter produced an especially rieh 

 amount of material. In thanking Dr. Friese I may say that 

 no other specialist has done so much practical scientific 

 work with my material. 



At the same time I am sure my friend and travelling 

 companion, Mr. P. Jorgensen, who was as energetic as 

 myself to work out and do all that was possible to invest- 

 igate the fauna of the district of Mendoza, and who is 

 still collecting there, will for his part agree to this thank. 



The district is unusually dry and exceedingly hot (ex- 

 treme heat 46'' C. = \\5° F.). Rain falls as a rule in local 

 showers, although occasionally heavy rainfall with terrific 

 thunderstorms occur. As a rule the sky is cloudless, and 

 the temperature, even in summer often falls to a consider- 

 able degree at night. In the district round the town of Men- 

 4Joza (about 2500 feet above sea level) it freezes not rarely 



