350 Dr. Heugliu's List of Birds 



gullet yellowish-carneous ; feet yellow, the joiuts more plum- 

 beous. 



115. Larus hemprichii. 



Lives with the former, but not in company with it. Long. 

 17" 4'" (ad ap. eaud.) ; 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 j 

 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-plants, 

 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, Riipp. 



More frequent in the southern parts of the Red Sea. Breeds 

 in July and August. Not rare on the Somali coast. 



117. Sterna affinis, Riipp. 

 With the former. 



118. Sterna caspta. 



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 ' 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. 



