Hymenoptera aculeata from Majorca and Spain. 625 
Cerbére, July 17, 1901 . é ; : : 179 specimens. 
Port Bou, June 24, 1901 : ; : 5 || we) - 
3arcelona, June 25 
. July 13 - 1901 é ; : : 310 sf 
July 16 
Montserrat (including Monistrol), oe 13-16, 1 493 
1901 ; ff us > 
| Duplic ates chiefly from Port Bou and Bar-) 187 
| celona, 1901 . Bs aed ee a 
| | 
| = 
_ Sierra de Guadarrama, La Granja (July 
20-26), and El Escorial (July 28), 
including a few from Segovia (July - 1902 330 ae | 
27), Madrid (July 17), and Burgos | 
(July 30) : ; ; : 
Motalecs ha 161678 53 | 
| 
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 rash 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 
