Zoological Society of London. 
235 
natis ; marginibus plumarum cinereis; intra margines lineis 
angustis nigris et a Ibis ornatis; tectricibus alarum et tertiariis 
pallidit castaneo-rubris balteis irregularibus ziczac fascia- 
tis; mterspatiis balteorum cinereo-albis; mento genisque 
albis maculd semilunati brunnea ad apicem singula plumes ; 
pectore et corporc inferiore pallidi .cervino-albis ; plumis 
pectoris ordine macularum saturate grisearum ad marginem 
ornatis. 
Upper surface light chestnut-red, all the feathers crossed by 
broad bars of brownish black and margined with grey, within 
which are two narrow lines of black and white; wing-coverts and 
tertiaries light chestnut-red, crossed by irregular zigzag bars of 
black, the interspaces margined externally with greyish white; 
chin and sides of the face white, with a narrow crescent-shaped 
mark of brown at the tip of each feather; sides of the breast 
chestnut, each feather tipped with white, within which is an in¬ 
distinct mark of deep black ; chest and under surface pale bully 
white, the feathers of the chest with a row of dark grey spots on 
each margin, giving that part a speckled appearance; primaries 
brown, narrowly edged with white; irides reddish orange; feet 
yellow ; bill horn-colour. 
Total length, male, 5 inches; bill, 11-lGths; wing, 3| ; tarsi,. 
ll-16ths. Female, 6 inches ; bill, ^; wing, 3j ; tarsi, f. 
ILab. Houtmann’s Abrolhos, off the western coast of Australia. 
Remark .—Like the rest of the genus, the male is much inferior 
in size to the female. The species is very nearly allied to, but 
much smaller than, Hemipodius varius. 
June 10, 1845.—Mr. Gould laid upon the table a series of 
Terns, and characterized a new species :— 
Sterna gracilis. St. summo capite et nuchd posteriore 
saturate nigris; lateribus nuchce et parte inferiore seriaceo- 
albis; pectore et abdominc leviter rosaceis ; rostro carnico- 
lore, apice brunneo-nigro; pedibus aureo-fuscis. 
Crown of the head, nape and back of the neck deep black ; 
sides of the neck and all the under surface silky white, with a 
