CALIFORNIA WATER BIRDS. 151 



later in the season led to the conviction that there must 

 be a rookery a short distance to the northward of Pt. Santa 

 Cruz. Also on the i6th, many Dark-bodied Shearwaters 

 were seen. They were flying steadily northward several 

 miles out from land. In an hour not less than a thousand 

 passed my boat. The movements of Shearwaters on the 

 days that immediately followed indicated, for they were 

 southward ones, that this was probably a local movement, 

 though it may have been the ending of the northward 

 migration of the species in this vicinity. In two males 

 and two females that were taken, the organs of reproduc- 

 tion exhibited no signs of recent erotic development, 

 which was also true of all captured afterwards. This 

 circumstance raises the question whether the breeding 

 habitat of this Shearwater is not in the Southern Hemi- 

 sphere, as is believed to be the case in Wilson's Petrel. 



June i8th, many California Murres were heading south- 

 ward. Some were also on the water. Viewed in the light 

 of the after movements, the stragglers on the water were 

 apparently birds that had temporarily paused in the 

 southward migration. Two females were taken. The 

 ovaries in both showed that they had recently bred. In 

 1892, no females were secured before July nth. The 

 first migratory waves, however, were not comprehended 

 that season, nor was there opportunity for thorough study 

 of them. As many Dark-bodied Sheawaters were noted 

 as on the i6th, but all were moving southward. 



June 19th and 20th the movements were about the 

 same as on the previous days. On the 21st there was an 

 increase in California Murres, individuals and small parties 

 in single file appeared from the northward, and passing 

 quickly by disappeared to the southward, keeping the 

 course of the coast- line. Solitary ones were quite nu- 

 merous on the water. At least a thousand Dark-bodied 



