46 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



Size very small ; wholly dark colored. 



Description. — Length 145 mm. Plain sooty black. Smallest of the 

 petrels found in Panama. 



Fig. 8. — Least petrel, golondrina de mar menuda, Halocyptena microsoma. 



Iris brown ; bill black ; tarsus and toes black. 



Measurements (from Murphy, Oceanic Birds S. Amer., 1936, p. 

 729).— Adult (sexes alike, 11 specimens), wing 118-125 (121), tail 

 50-56 (53.4), exposed culmen 11-12 (11.4), tarsus 20.5-22 (21.2) 

 mm. 



