456 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



Measurements (from Murphy, I.e., p. 1123). — Males (from Ba- 

 hamas, Fernando Noronha, Rocas, South Trinidad, and St. Helena) , 

 wing 285-310 (300), tail 162-177 (168.8), exposed culmen 42-47.6 

 (44.5), tarsus 22.1-25.2 (23.6) mm. 



Females (from Bahamas, Fernando Noronha, South Trinidad, and 

 St. Helena), wing 292-306 (297.1), tail 152-185.5 (171.3), exposed 

 culmen 41.2-43 (42.3), tarsus 22-24 (23) mm. 



Accidental in occurrence. 



Inclusion of the typical race is based on two specimens that I 

 have examined in the British Museum (Natural History), both well- 

 marked examples of this subspecies. One was sent by Arce to Salvin, 

 who recorded it as from "Santiago de Veragua." As the locality is 

 inland, and in the Pacific lowlands, the birds must have been a wan- 

 derer, perhaps storm-blown, as so often happens with these birds. 

 The second was forwarded to Salvin by McLeannan and has no 

 locality data other than "Panama." Presumably it is from the Carib- 

 bean side since that is where this collector obtained nearly all of his 

 birds. 



All published records are based on these two skins. Griscom, and 

 Hellmayr and Conover, recorded the Santiago bird under the name 

 crissalis through the assumption that it would be the Pacific race be- 

 cause of the locality. 



STERNA FUSCATA CRISSALIS (Lawrence) 



Haliplana fnliginosa var. crissalis Lawrence, Proc. Boston Soc. Nat. Hist., vol. 

 14, 1871 (Apr. 1872), p. 285. (Isla Socorro, Islas Revilla Gigedo, Mexico.) 



Characters. — Similar to Sterna f. fuscata, but with underparts 

 more strongly gray, a color that extends forward on the breast. 



Measurements. — Males (five from Tres Marias, Socorro, and 

 Panama), wing 278-292 (287), tail 135-174 (150), exposed culmen 

 40.0-43.5 (41.5), tarsus 21.0-24.0 (22.6) mm. 



Females (7 from Tres Marias, Galapagos, and Panama), wing 

 271-298 (286), tail 124-174 (153), exposed culmen 41.0-43.5 (41.8), 

 tarsus 21.0-23.0 (22.1) mm. 



Breeds on Islas Frailes del Sur, off Punta Mala ; ranges the adja- 

 cent waters of the Gulf of Panama and the open sea. 



My second visit to the rocky islets known as Los Frailes off Punta 

 Alala was made on the launch Barbara II with Captain George Edg- 

 ington. We came out of a rough overnight anchorage at Isla Iguana 

 on the morning of March 18, 1962, with a strong wind blowing. As 

 we approached Los Frailes del Sur I made out circling terns, and 



