100 



8. Colleles furfuraceus, Holmb. The females of this spe- 

 cies are found almost without exception upon a large bushy 

 Baccharis species throughout the summer, The males do not 

 confine themselves to any Single plant. 



9. Colletes argentinus, Friese. Similar to no. 8, but also 

 on several other plants, chiefly on low Solanacece. 



11. Bicolletes neotropica, Friese. No definite plant can 

 be stated for this species, which is to be found in numbers 

 by sweeping low plants. 



12. Biglossa thoracica, Friese. Both sexes of this beautifui 

 and conspicuous species are almost without exception found 

 on Physalis (see no 7) and especially in great numbers at 

 Chacras de Coria (close to Mendoza) during the autumn 

 months (February — April). The males however at times went 

 to other plants; in the primary ränge to the Cordilleras the 

 species was found on a bushy Solanacee. 



14. Biglossa armala, Friese. Chiefly on Baccharis mar- 

 ginalis var. coerulescens and Parchenium hysterophorus, 

 especially in midsummer (January — February). The males 

 were somewhat less particular with respect to their choice 

 of flowers. I found specimens in copula on flowers of Bac- 

 charis. 



16. Caupolicana lugubris, Sm. As Dr. Friese has already 

 mentioned, this beautifui bee is found on Hoffmanseggia 

 falcaria, Cav. (in the lowlands). In the primary ränge to the 

 Cordilleras I have seen them flying to Ccesalpinia brea, R. 

 P. and a few other plants. 



17. Ptiloglossa ducalis, Sm. On a Cucurbiiacee. 



18. Haiictus paramorio, Friese. As no. II. 



19. Haiictus Jörgenseni, Friese. As no. II. 



20. Haiictus Jensen!, Friese. As no. II, but rare. 



21. Augochlora argentina, Friese. Exceedingly common 

 and on many different plants, although apparently preferring 

 Solanum elceagnifolium, Cav., which flowers the whole 

 summer through. On my first journey I one day dug this 

 species up from its nest in the ground in the neighbourhood 

 of Santa Rosa. It is found throughout all the summer months. 



22. Nomia Jörgenseni, Friese. This beautifui bee is com- 

 mon in the district the whole summer although only flying 

 in the mornings, unless the day began with rain or with a 

 heavy cloudy sky, only very rarely seen during the after- 

 noon. It was almost without exception taken on Baccharis 

 marginalis var. coerulescens. On the 23rd January I obser- 

 ved a female go down into its nest in the ground, in the 

 neighbourhood of Pedregal, but as the ground was very 



I 



