107 



107. Epeolus speciosus, Friese. Amongst other plants on 

 Grindelia. 



109. Epeolus Burmeisteri, Friese. See Introduction p. 97. 



Epeolus viperinus, Holmb. On Grindelia and Convol- 

 vulus besides other plants. 



Epeolus rufiventris, Friese. See Introduction p. 99. 



112. Melissa Jenseni, Friese. Almost always on Hojf- 

 manseggia in the Pedregal district, $$ as a rule more fre- 

 quent than cTcT. On the primary ränge to the Cordilleras 

 de Mendoza it visited Ca^salpinia brea, Senecio sp. and 

 some other plants. Here were cTcT more common than $$. 

 In the lowlands the species was occasionally taken on Cir- 

 sium lanceolatum or another imported, allied species. 



113. Melissa maculata, Friese. In very small numbers 

 with the preceeding on Ccesalpinia brea on the primary 

 ränge above Mendoza. 



114. Bombus opifex, Sm. In quite small numbers, chiefly 

 on Cirsium in the lowlands, but on different plants in the 

 mountains. Freshly emerged large queens could be found 

 late in the summer. 



115. Apis mellifica var. ligiistica, Latr. Very common 

 everywhere, although mostly gone wild, and on every kind 

 of flower (except cactus) throughout the summer. Of all the 

 bees in the neighhourhood the 99 of this species were the 

 first to begin work in the morning, and they kept on tili 

 long after all others had left off. 



Two new Argentine species of Apidae. 



Described by A. C. Jensen-Haarup. 



Centris Lyngbyei n. sp. $. 



Allied to C tricolor, Friese, but more robust and easily 

 distinguished from the $ of this species by its bright lemon- 

 yellow labrum and clypeus. 



$. Labrum Z^mon-y^Z/oH^.ratherdenselyclothed with Short, 

 erect, black hairs; clypeus of the same colour, very shiny, 

 almost smooth. Forehead densely clothed with coal black 

 hair; vertex, hehind eyes and occelli, with ochraceous 

 pubescence. First dorsal segment of abdomen wich pale 



