172 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



241. Larus delawarensis, Oril. 



Common in winter.— (Sennett, B. Rio Grande, G4.) 



242. Chrcecocephalus atricilla, (Liun.) 



Common resident, breeding near the coast, and also on the salt prai- 

 ries near the fort. — (Dresser, Ibis, 186G, 44. — Larus a., Sennett, B. 

 liio Grande, G4.) 



243. Sterna angiica, Mout. 



Rather abundant. Found breeding in company witli Forster's Tern. — 

 (Sennett, B. Rio Grande, C4. — S. aranca, Dresser, Ibis, 18GG, 44.) 



244. Sterna caspia var. imperator, Coues. 



Breeds on Padre Island.— (Sennett, B. Rio Grande, Go.) 



245. Sterna maxima, BodJ. 



Breeds on Padre Island.— (iS^. 7'egia, Dresser, Ibis, 18GG, 44.) 



246. Sterna cantiaca, Gni. 



Breeds on Padre Island. — (Sennett, B. Rio Grande, G3.) 



247. sterna forsteri, Nutt. 



On May IG, 1877, Mr. Sennett and I found a colony' of these Terns nest- 

 ing on a nearly submerged grassy island, among lagoons and marshes. 

 They had but just begun to lay. About two dozen eggs were obtained, 

 and a few parents shot for identiQcation. The nests w^ere slight depres- 

 sions among the short grass, and the eggs were frequently wet. — (Sen- 

 nett, B. Rio Grande, G5.) 



248. Sterna antillarum, (Less.) 



Common in summer, and some pass the winter. Deposit their eggs 

 on sand-bars in the river. — {S. frenata, Dresser, Ibis, 18CG, 44. — S. 

 superciliaris antillarum, Sennett, B. Rio Grande, GG.) 



249. Hydrochelidon nigra, (Linu.) 



Rather plentiful during summer. — [H. plumlca, Dresser, Ibis, 18GG, 

 45.) 



250. Rhynchops nigra, Liuu. 



Xot rare in summer. — (Dresser, Ibis, ISGG, 45. — Sennett, B. Rio 

 Grande, GG.) 



251. Podiceps domiuicus, (Liuu.) 



A rather common resident. Several nests, undoubtedly of this Grebe, 

 were found on May IG, 1877, while visiting the heronry already referred 

 to. They were made of water-plants and pieces of reeds slightly fas- 

 tened to one or two tule-stalks, and forming a wet, floating mass. IS'o 

 eggs were obtained.— (Sennett, B. Rio Grande, GG.) 



Xote.— So far as it appears, Dr. Merrill's claim (Bull. X. O. C. I, 88), 

 to have been the first to have really added this species to the North 



