104 
Psyche 
[September 
and Ponape (one of the Caroline Islands) . The hosts known 
to me are the Albatross, Diomedea irrorata Salvin ; the Red- 
tailed Tropic-bird, Phaethon ruhricauda Boddaert ; the 
White-bellied Booby, Sula leucog aster (Boddaert), and the 
Small Noddy, Anous minutus Boie. 
Olfersia bisulcata Macquart 
The type of this species passed into the Bigot Collection 
and is now the property of Mr. J. E. Collin. According to 
his detailed account, it has all the characters of the well- 
known Olfersia vulturis van der Wulp, a name which will 
pass in the synonymy. 0 . bisulcata , originally described 
from Chile, is a common species throughout Central and 
South America. I have seen it from Mexico, Yucatan, 
Guatemala, Panama, Venezuela, Brazil, Bolivia, Peru, and 
British Guiana. 0 . vulturis was described from Costa Rica. 
The usual hosts are the South American Vultures, Cath- 
arista urubu (Vieillot) [=Coragyps atratus (Meyer)], 
Gypagus (or Sarcoramphus) papa (Linnaeus), and Ca- 
thartes aura (Linnaeus) ; but there are also records from 
Turkey Buzzard, smaller Hawks and Condor. 
Olfersia fumipennis (Sahlberg) 
Pseudolfersia maculata Coquillett, of which I saw the 
holotype at the U. S. National Museum, is in my opinion 
identical with O. fumipennis, originally described from Fin- 
land. The species appears to be very rare in Europe, since 
I have been unable to find another record from that part of 
the world. In North America, however, it is one of the 
common hippoboscids. I have seen specimens .from Ver- 
mont, Massachusetts, New Hampshire, Wisconsin, Michi- 
gan, Minnesota, New York, New Jersey, Pennsylvania, Vir- 
ginia, North Carolina, Florida, Louisiana, Texas, Kansas, 
and Cuba. In most cases the host is the Osprey or Fish- 
hawk, Pandion haliaetus (Linnaeus) [typical form in Fin- 
land; race carolinensis (Gmelin) in North America]; but 
a few specimens have been taken off Loon, Gavia immer 
(Briinnich), Bald Eagle, Haliaeetus leucocephalus (Lin- 
naeus), and Hawks. 
