132 CALIFORNIA ACADEMY OF SCIENCES {[Proc. 4TH Ser. 
MEASUREMENTS (in millimeters) 
Upper Mandible Middle 
No. Sex | Length} Extent | Wing | Tail |Culmen|——___, ______| Tarsus |Toe and 
Depth | Width Claw 
9519 | of 470 | 1145 | 333 | 113 {| 43.7 | 12.2 | 18 52.7 | 66.1 
9520 | of 480 | 1090 | 322 | 113 | 43 LW MAS Wh GBA Wh (4 
9521 | of 485 |...... 330 | 111 | 44.7 | 12 18.5 | 50.7 | 66.5 
EV IAT aro ahin Rent tse acs han 327 | 111 | 42 12 17.7 | 50.3 | 63.4 
9523 | of 490 | 1105 | 325 | 119 | 43.4 | 12 18.1 | 49.3 | 66.2 
9524] of 470 | 1095 | 3212) 108 | 44.2 | 12.7 | 18.5 |} 51.7 | 64.3 
95257| of 480 | 1085 | 3217] 113 | 42.9 | 11.9 | 18.5 | 50.8 | 69 
186884 of 470 | 1092 | 326 | 108 | 40.2 | 11.3 | 18 51.1 | 66.4 
18689!) of 470 | 1092 | 3254 112 | 41.3 | 12.8 | 18 50 65 
186871} 9 489 | 1080 } 329 | 111 | 41.6 | 11 16.8 | 52.1 | 68.6 
186901; 9 483 | 1118 | 3287] 116 | 42 12.5 | 18.4 | 52.8 | 67.4 
Puffinus griseus (Gmelin): Sooty SHEARWATER 
Coues—Nectris fuliginosus, II, 123, 143; Nectris amaurosoma, II, 124, 
143; Puffinus fuliginosus, V, 192; Puffinus amaurisoma, V, 192. 
SaLvin—Pufiinus griseus, 370, 386. 
GopMAN—Puffinus griseus, xlii, 145, pl. 38. 
After breeding in the South Temperate Zone, the Sooty 
Shearwaters in their exodus-migration cross the Equator in 
great numbers. Off Point Pinos, California, they arrive in 
strength during the latter part of April and in May, and are 
very abundant at intervals until later autumn. Stragglers 
occur after the departure of the hosts for their Southern Hemi- 
sphere breeding stations, Mr. Beck and myself having obtained 
individuals in December and January. Seventy-five observed 
by Mr. Beck on February 27, 1907, thirteen of which were 
taken, apparently belonged to the vanguard of that year’s 
migration; in common with the Cooper’s Shearwaters whose 
advent was on the same day. 
Usually the Sooty Shearwaters avoid the landlocked har- 
bors. At times, however, they follow their prey through the 
Golden Gate to San Francisco Bay, venturing as far as Alca- 
traz and Angel islands. The Expedition lost sight of them in 
the vicinity of the San Benito Islands, Lower California, and 
did not meet with them again until the home voyage was nearly 
over, the course of the schooner Academy being outside of 
1 Mus. Vertebr. Zool., Univ. Calif, 
2 Distal primary not fully grown. 
