Hippoboscide: in the British Museum. 265 
as usual, non-chitinized immediately before joining the fourth 
vein. 
The typical specimens are male and female. 
Olfersia coriacea, v.d. Wulp: op. cit. p. 430, tab. xiil. 
figs. 2, 2a.—Two specimens are mentioned by the author— 
one from Presidio, Mexico (Forrer), the other from Mirandilla, 
Guatemala (Champion). The former specimen (a male) 
belongs to Olfersia propinqua, Walk. (List Dipt. iv. p. 1141 
(1849)), the type of which is from Jamaica. ‘The specimen 
from Mirandilla, on the other hand, which is also a male, and 
must be regarded as the actual type of O. coriacea—since it 
is the specimen figured, while, from internal evidence, the 
description appears to have been based upon it,—is a Pseud- 
olfersea, Coquillett, under which genus it has been placed in 
the Museum collection. Van der Wulp having apparently 
relied upon this latter specimen in preparing his description, 
there is no necessity to cancel the species, which may there- 
fore be allowed to stand as Pseudolfersia coriacea, v. d. Wulp. 
In tab. xiii. fig. 2, the drawing of the clypeus is misleading, 
and conveys no idea of its true length; details of the venation 
(fig. 2 a) are also inaccurate. 
The British Museum collection contains two other speci- 
mens, previously undetermined, that I have referred to the 
present species—a female from Orizaba, Mexico (Sallé), and 
another from the Rio Tapajos, Brazil (W. Bates). 
Olfersia angustifrons, v. d. Wulp: op. cit. p. 430, tab. xiii. 
figs. 3, 3a.—This is a true Olfersza, belonging to the group 
in which the palpi are proportionately elongate. A third 
specimen (a gravid female) from Oajaca, Mexico (Sallé), is in 
the Museum collection, 
PSEUDOLFERSIA, Coquillett. 
Pseudolfersia (Feronia) spinifera, Leach: op. cit. p. 557, 
tab. xxvi. figs, 1-3.—As has been suggested by Speiser 
(Zeitschr. f. syst. Hym. u. Dipt., i. Jahrg. Heft 3 (1 May, 
1902), p. 147), Ornithomyta unicolor, Walk. (List Dipt. iv. 
p- 1144), from Jamaica, is a synonym of this species. 
According to Walker (loc. cit.), the type of O. unicolor and 
a second specimen from Jamaica were found on Lphialtes 
grammicus and on Fregata aquila. Our other specimens of 
Pseudolfersia spinifera include a male from Pard, Brazil, 
23.iv.1899 (W. A. Churchill), from Catharistes urubu ; a female 
from Ascension (7. Conry); a female from Little Aden, 
Arabia, 6. iv. 1895 (Lt.-Col. Yerbury), “ taken on a booby ” 
