99 



shine. lipon counting the results of a few catches over the 

 colonies in the middle of January (1907) the result was: 

 Ancyloscelis 68, Epeoliis Burmeisteri 26 (together wich one 

 specimen of Epeolus rufiventris, Friese; giving ihese numbers 

 in the ratio of per cent will the result be TZ., and 27.7 

 respectively. If I do not make a mistake I remember seeing 

 Single specimens of Epeolus Burmeisteri going down in the 

 Ancyloscelis holes. 



In spite of all the collecting and searching in the above 

 mentioned district, it has not succeeded in finding Melipo- 

 nids there, although a species of Trigona is found at San 

 Luis that lays a little southward though more central in 

 land. 



I make use of the present opportunity to tender my 

 thanks to Prof. Warming and Dr. Ostenfeld in Copenhagen, 

 Prof. Lindman in Stockholm and Prof. Rob. Fries in Up- 

 sala for their kind assistance in determining the plants, 

 which are especially visited by bees. 



I am also indebted to my friend, Mr. B. G. Rye in 

 Copenhagen for valuable assistance. 



1—5. Sphecodes. Of the various Sphecodes species I 

 am unable to give any information with reference to their 

 habit of visiting flowers. I can however remember (most 

 probably February 1907) that I found a Sphecodes nigri- 

 pennis, Friese, fighting with a wasp (Hym. foss.) at Chacras 

 de Coria. As I took them they were so tightly embraced 

 that I thought at first that I had found a species in copula. 



6. Temnosoma metallicum, Sm. This bee, which in size 

 and colour resembles Augochlora argentina, Friese, is only 

 found singly and almost always on Baccharis marginalis, 

 DC. (var. coerulescens (DC), Heer, and Parchenium hyste- 

 rophorus, L., upon which plants Augochlora argentina only 

 quite exceptionally is met with. 



7. Colletes bicolor, Sm. This species, which as for as 

 individuals go only is found singly, is met with almost every- 

 where in the Andes and also far out into the lowlands 

 (for ex. Santa Rosa). It is chiefly found on a species of 

 Physalis together with Nr. 12. 



7* 



