488 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



c. Under parts much more purely and extensively white, the gray tinge very 

 faint and confined to posterior portions. (Tropical and subtropical portions 



of Atlantic Ocean.) Sterna fuscata fuscata (p. 514)'. 



cc. Under parts much less purely white, the gray tinge much stronger and ex- 

 tending forward to chest. 

 d. Lateral rectrices less elongated (135-170 mm.) and with inner webs more ex- 

 tensively dusky terminally. (Pacific coast of America, from Trcs Marias 



to Galapagos islands.), Sterna fuscata crissalis (p. 519). 



dd. Lateral rectrices more elongated (191-210 mm.) and with terminal portion 

 of inner webs less extensively dusky. (Hawaiian Islands; Liu Kiu 

 islands?) Sterna fuscata oahuensis (extralimital).a 



STERNA TRUDEAUII Audubon. 



TRUDEAU'S TERN. 



Adults in summer (sexes alike). — General color plain pale gray 

 (nearest lilac gray), paler (nearly white) on rump, upper tail-coverts 

 and tail, fading into white on head and upper neck, the primary 

 coverts and greater part of primaries still paler gray or silvery white, 

 the outer web or outermost primary deeper gray than back, etc., the 

 inner (proximal) primaries with inner webs becoming dusky toward 

 edge and margined with white; a spot of black immediately in front 

 of eye, and a less sharply defined postocular stripe of the same, occu- 

 pying upper portion of auricular region; axillars and under wing- 



« Sterna oahuensis Bloxham, Voy. 'Blonde', 1826, 251 (Oahu, Hawaiian group).— 

 Onychoprion fuscatus oahuensis Mathews, Birds Australia, ii, no. 4, Nov. 1, 1912, 394 

 (Hawaiian group). — Planetis guttatus Wagler, Isis, 1832, 1222 ("Waihu," i. e., Oahu; 

 =young). — Sterna guttata Forster, Descr. Anim., ed. Lichtenstein, 1844, 211. — 

 Sterna fuliginosa (not of Gmelin) Stejneger, Proc. U. S. Nat. Mus., xii, 1890, 379 

 (Kauai, Hawaiian group); Henshaw, Birds Hawaiian Islands, 1902, 122 (Oahu; 

 Kauai; Laysan, breeding); Fisher (W. K.), Bull. U. S. Fish Com. for 1890, 11, pi. 2, 

 figs. 1-4 (Laysan, breeding). — Haliplana fuliginosa Rothschild, Avifauna Laysan, etc., 

 i, 1893, 39, pi. of nesting place. — (?) Sterna fuliginosa crissalis (not Haliplana fuligi- 

 nosa var. crissalis Lawrence) Bangs, Bull. Mus. Comp. ZooL, xxxvi, July, 1901, 256 

 (Liu Kiu Islands). 



Besides the forms mentioned above, the following additional subspecies are recog- 

 nized by Mr. Gregory Mathews: 



Sterna fuscata serrata. — Sterna serrata Wagler, Naturl. Syst. Amphib., 1830, 89, 

 footnote (New Caledonia); Reichenbach, Natat. Novit., 1850, p. Ixix, pi. 332, figs. 

 3635-3637. — Onychoprion serratus Gray, List Gen. Birds, 1840, 79. — Haliplana serrata 

 Boie, Isis, 1844, 190. — Sterna (Onychoprion) serrata Gray, Cat. Birds Trop. Is. Pacific, 

 1859, 59. — Onychoprion fuscatus serratus Mathews, Birds Australia, ii, pt. 4, Nov. 1, 

 1912, 389, 394 (Australian seas). — [Sterna] gouldii Reichenbach, Natatores, Larinae 

 1848, pi. 22, fig. 829; Nov. Syn. Av., 1850, [p. 2], pi. 272, fig. 2267-G8.— Onychoprion 

 fuliginosus? Gould, Birds Australia, vii, 1848, pi. 32. — Sterna melanura Gould, Proc. 

 Zool. Soc. Lond., 1837, 156 (New South Wales; =young). 



Sterna fuscata infuscata. — St[erna] infuscata Lichtenstein, Verz. Doubl., 1823, 81 

 (East Indies "et Insulis aleuticis"). — Haliplana infuscata Boie, Isis, 1844, 190. — 

 Thalassipora infuscata Riippell, Syst. Ueb., 1845, 140 (Red Sea) — Hydrochelidon in- 

 fuscata Heuglin, Orn. Nord Ost-Afrika, ii, 1873, 1457 (not of pp. 1512 and ccvi, which 

 =5. anxthela fuligula). — Onychoprion fuscatus infuscatus Mathews, Birds Australia, 

 ii, no. 4, Nov. 1, 1912, 394 (Indian Ocean). 



