64 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH Ser. 
Dr. Walter K. Fisher has recorded a wing-measurement 
of 150 mm.,? taken from one of the hornotines mentioned 
above (No. 189406 U. S. Nat. Mus.). On lifting the under 
wing-coverts of this specimen, I find that the four outermost 
primaries are still in the sheath. Doubtless, the primaries 
were in a similar stage in the short-winged specimens re- 
ported by Prof. Homer R. Dill? According to the original 
account, the “wing-feathers”’ of the lost type were “not quite 
fully grown.” 
MEASUREMENTS (in millimeters) 
Fork Middle 
No. Locality Sex | Wing | Tail | of | Cul-| Tar- |Toe and 
Tail | men] sus | Claw 
23468 8 | Laysan I., Haw. Arch....| co | 182 | 100 | 39 17 (27.9) 29.4 
23469 3 oe oY oe o | 192 | 100 | 34 118.3/27.7| 30 
2112244 | Near Midway I., Haw. 
Arch een a re Q | 184 | 110 | 44 |17.7/26.3] 28 
Oceanodroma markhami (Salvin): MarkHAM’S PETREL 
Oceanodroma melania (Bonaparte): BLAcK PETREL 
Oceanodroma furcata (Gmelin): FORK-TAILED PETREL 
Oceanodroma hornbyi (Gray): Hornsy’s PETREL 
OCEANITIN/ZE: Lonc-teccen StoRM PEFTRELS 
Key to the Species 
Basal joint of middle toe at most only slightly flattened, and shorter 
than remainder of toe and claw 
Upper tail-coverts white 
Breast and abdomen dark................ Oceanites oceanicus 
Lower breast and abdomen white................. O. gracilis 
Breast and sides white with dark streaks...... Pealea lineata 
Upper tail-coverts not white 
Nomwhitevonvheadssane ose aco aor oes Garrodia nereis 
Forehead, lores, and superciliary stripe white.............. 
UO aN EI ai peice A aoe eae Suc spina sts Pelagodroma marina 
1 Bull. U. S. Fish Com. for 1903, p. 27. 
2 Bull. No. 42 Biol. Surv., U. S. Dept. Agric., pp. 18, 19. 
3 Mus. Vertebr. Zool., Univ. Calif. 
4U.S. Nat. Mus. 
