Genus — S U L A . 
Sul A Brisson, Omith., Vol. VI., p. 494, 1760 . . Type S. Uucogaster. 
Also spelt — 
Svca Temminck, Manuel d’Orn., p. 592, 1815. 
Jtda EUman, Zoologist 1861, p. 7472. 
Dysporus Illiger, Prodromus Syst. Mamm. et Av., 
p. 279, 1811 .. .. .. .. .. Type 8. leucogaster. 
Also spelt — 
Diaporus Boie, Isis 1826, p. 980. 
Sularius Rafinesque, Analyse Nat., p. 72, 1815 (c/. Auk, 
26, p. 50) . . . . . . , . . . . . Type 8. leucogaster. 
Abeltera Heine, Nomencl. Mus. Hein. Ornith., p. 351, 
1890 . . . . . . . . . . . . Type 8. leucogaster. 
Hemisula Mathews, Austral Avian Record, Vol. II., 
p. 55, 1913 . . . . . . . . . . . . Type 8. leucogaster. 
Small Suline birds of dark coloration above, with general characters as in 
Piscatrix, but with different proportions. 
The biU is a little longer, but the tail is much shorter, while the 
metatarsus and toes are notably long. 
The bill is typically Suline, more than half the length of the tail, but 
less than twice the metatarsus. 
The wing is long, more than twice the length of the tail. 
The metatarsus is coarsely reticulate with small scales, the scales being 
smaller on the hinder aspect. 
The toes have the posterior Joints clearly reticulate, the anterior ones 
covered with scutes more or less broken up. 
This genus is defined at once by the coloration of the adult, a character 
differentiating it at once from the rest of the Suline birds. 
The immature plumage of this bird and Piscatrix show great similarity, 
while the adults show just as great a dissimilarity. The evolution of Piscatrix 
from its immature whole brown plumage passes through the stage when 
the brown is lost on the belly first. The present genus seems to show 
a peculiar stoppage in this course, this bird showing a brown coloration 
throughout, save the breast and abdomen, which are pure white. Though 
practically the same wing-length is developed, the tail in Piscatrix has grown 
much longer, the metatarsus lengthening in 8ula. 
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