Hymcnoptera aetdeata from Majorca and SpoAn. 625 



either obscure or represented by insufficient material. 

 Only 73 species, or as nearly as possible half of the 

 Majorcan species, are common to the two lists, so that 

 altogether 275 species are distinguished in this memoir. 



It would be rasli to build much on a comparison of the 

 lists of Aculeates obtained in such short visits, lists which 

 are obviously very incomplete. Nevertheless, they prob- 

 ably contain the majority of the commonest species to be 

 found at the times when the collections were made. A brief 

 tabular statement (see p. 626) will show at a glance the 

 groups which in our limited experience were found to 

 be strongly or feebly developed in the island fauna as 

 compared with the mainland. 



A brief account of the chief characteristics of the 

 localities on the mainland is given below. The order 

 followed is that of the dates, beginning with the earliest. 



1900. 



In the wet and cold spring of 1900 I stayed at Barcelona 



for two or three days before visiting Majorca. On March 



20 a little collecting was attempted at Vallvidrera, on the 



ridge of the hills behind the city. It was rather warmer 



