15b CALIFORNIA ACADEMY OF SCIENCES. 



not ascertained whether they were actually accessions to 

 the locality (stragglers of a night or off-shore migration, 

 visiting the bay from temporary roosting places), or 

 whether they were simply birds from rookeries a little 

 lower down the coast and were enlarging their food-area 

 by making daily excursions into the bay. On the 14th 

 an incident happened that seemed to indicate that migra- 

 tion from the north was actually in progress in this species. 

 A little company of young, headed by a fine adult, round- 

 ed Pt. Pinos during the morning and moved south. At 

 the Point the young seemed to show a disposition to 

 break away from the leadership of the old one, attempt- 

 ing several times to return into the bay, but each time the 

 old bird got them straightened out by heading them off, 

 and finally disappeared with them in line at his tail in the 

 direction of Pt. Cypress. Also on the 14th, quite a num- 

 ber of Pigeon Guillemots were observed on the water and 

 passing in and out of the bay, but no migratory movement 

 was apparent, there seemingly being a lull in the migra- 

 tion of the species. Three or four California Murres 

 were seen; two were on wing going southward. A Wan- 

 dering Tatler appeared on the rocks near the Seaside 

 Laboratory. This species was not met with in the weeks 

 that preceded. In 1892, the 23d of July was my earliest 

 record. 



On the i6th, 17th, and i8th migration was almost at a 

 standstill. On the i6th an American Eared Grebe and 

 two young Pigeon Guillemots were captured. The ovary 

 of the Grebe was that of a breeding bird of the season. 

 Another young Pigeon Guillemot was seen on the 17th, 

 upon which day adults were scarce. The Grebe and the 

 young Guillemots were new birds for the season, so far 

 as determined by my observations. On the 17th, for the 

 first time, Heermann's Gulls appeared to outnumber 



