350 Dr. Heuglin’s List of Birds 
gullet yellowish-carneous; feet yellow, the joints more plum¬ 
beous 
115. Larus hemprichii. 
Lives with the former, but not in company with it. Long. 
17" 4'" (ad ap, caud.); 19" 1'" (ad ap. alar.); tars. 1" 11'"; al. 
12" 11"'. Beak in the old bird greenish-corneous, sometimes 
more yellowish, point deep wax-yellow; a coral-red band before 
it, bordered posteriorly with black; angle of mouth deep-red; 
feet deep-yellow. Young : Beak plumbeous, with a black band 
and a pale wax-yellowish spot at the top ; gullet reddish-carne- 
ous; eye-ring blackish-carneous ; feet greenish-plumbeous. 
Both species, Larus leucophthalmus and L. hemprichii , feed 
upon crabs and Mollusca; live in large flocks, more on the 
African coast; breed socially on the sand, among salt-pi ants, 
often rather distant from the coast. Their breeding-time is 
between July and September. In November and December 
they seem to migrate to the south in large flocks. 
116. Sterna velox, Rupp. 
More frequent in the southern parts of the Red Sea. Breeds 
in July and August. Not rare on the Somali coast. 
117. Sterna affinis, Rupp. 
With the former. 
118. Sterna caspia. 
In pairs through the whole year in the Red Sea and the Gulf 
of Aden. Abu Djirreh : Arab. 
119. Sterna fuliginosa. 
In pairs or little flocks in the Red Sea south of 14° N.L., 
and on the Somali coast. Rare on the Guano-island of Bur-da- 
Rebschi. Gullet bluish-carneous. [A specimen of the younger 
bird : above, dark brown with white spots; below, paler brown ; 
beak, white; agrees exactly with the figure given by Gould, in 
the e Birds of Australia/ pi. xxxii. vol. 7. — Ed.] 
120. Sterna infuscata. 
With the former; not found on the island of Bur-da-Rebschi. 
Length, 14"; wing, 9" 9 "; tars. 9"'. Gullet blackish. 
