B. W. EVERMANN : NOTES ON ROOKERIES, PRIBILOF ISLANDS. 265 



This is quite certainly a greater number of pups than belong to the 15 

 bulls, as the pups have already begun to gather into pods, thus destroy- 

 ing the integrity of the families. At one end of the area observed was 

 a very large pod of pups, many of which undoubtedly belong to families 

 further away. 



In making the count of harems a good many cows and a great many 

 pups were not counted, as they did not seem to belong to any particu- 

 lar family. These cows had been served, and were consequently allowed 

 to wander from their lords. The pups, apparently, do not long remain 

 in the families where they belong, but soon begin to wander about and 

 to collect for a part of the day at least into large bunches or pods. 



From the first count it would appear that at least 121 out of a possi- 

 ble minimum of 211 cows were out feeding at this time. This is over 

 56 per cent. By the second count it appears that out of a necessary 

 minimum of 600 cows at least 400 or 66| per cent, were out feeding.. 

 These per cents are based, however, upon the supposition that all the' 

 pups have been born. As some of the cows have quite certainly not. 

 yet had their pups, the percentage of cows out feeding is even greater 

 than here indicated. 



Lukannon Eookery occupies chiefly a long narrow rocky strip lying 

 between the water and an approximately vertical bluff. At certain 

 places this bluff is irregular and broken so that seals can climb to its 

 top and spread out upon the relatively level land back of it. The fol- 

 lowing sketches represent roughly four cross sections oi this rookery : 



1. Cross section near right end of Lukannon Rookery, July 19, 1892. 



From a to b the seals were apparently as thick as they ever were ; 

 from b to c there were a few seals, yet the ground showed that it had 

 all been used at one time; from c to d there were no seals, but the rocks 

 on this strip were worn quite smooth and there was no vegetation 

 except a thin coating of the algoid growth so common on abandoned 

 portions of rookeries. 



tA/aier 



2. Cross section of Lukannon Rookery at left of No. 1, July 19, 1892. 



Seals occupied the entire space from a to b. The space from c to d, 

 averaging perhaps 100 or 125 feet in width, has been used by seals in 

 recent years as shown by the smooth worn rocks and the character and 

 scarcity of vegetation, but only a few bachelor seals were to be found 

 there now. 



I few 

 wa.ie?> ^hickly covered.^ 



3. Cross section of Lukannon Rookery at left of Jtfo. 2, July 19, 1892. 



