264 Mr. E. E. Austen on 
specimens, from the following hosts: Ortyx virginiana, Sauro- 
thera vetula, Geotrygon sylvatica, G. montana, and Tityra 
Leuconotus. 
A single female from St. Domingo (Tweedie) belongs to a 
distinct species, which I have not as yet determined. 
According to Speiser (Zeitschr. f. syst. Hymenopt. u. Dipt. 
i. Jahrg. Heft 3 (1 May, 1902), p. 163), Olfersia impressa, 
Bigot (Ann. Soc. Ent. Fr. 1885, p. 237), from California, 
belongs to this genus. 
OLFERSIA, Wied. 
The type of Feronia americana, Leach (op. cit. p. 557, 
tab. xxvii. figs. 1-3), which has been adopted as the typical 
species of this genus, is in the Museum collection, and bears 
a label in Leach’s handwriting. 
 Ornithomyia plana, Walk. (Journ. Proc. Linn. Soc. v. 
p. 254), from Dorey, New Guinea, is an Olfersia. 
Ornithomyta intertropica, Walk. (List Dipt. iv. (1849), 
p- 1144), is also an Olfersia. The type of this species was 
obtained (with three other specimens) by Charles Darwin in 
the Galapagos Is.; the other examples of O. intertropica 
contained in the Museum collection include one male and two 
females from Honolulu, Sandwich Is. (H. Pease), “ from the 
ear of an owl”; a female from Orizaba, Mexico (Sallé) ; 
and two females from Bahia, Brazil. 
Olfersta acarta, Speiser (Zeitschr. f. syst. Hym. u. Dipt., 
ii. Jahrg. Heft 3, p. 149; see also Fauna Hawaiiensis, 
Diptera, Supplement, p. 87), appears to me, after comparing 
three of the specimens obtained by Perkins on short-eared 
owls in Kona, Hawaii, which were determined by Speiser 
and are now in our collection, to be identical with O. znter- 
tropica, Walk. It may be worth while to note that the actual 
type of O. acarta, Speiser, is in the Bremen Museum (ef. 
Speiser, Zeitschr. f. syst. Hym. u. Dipt., ii. Jahrg. Heft 3, 
p- 151). 
Olfersia vulturis, v. d. Wulp: op. cit. p. 429, tab. xiii. 
figs. 1, 1 a.—This species has the clypeus greatly elongated, 
and consequently belongs to the genus Pseudolfersia, Co- 
quillett (Canad. Ent. xxxi. (1899), p. 336). The figure of 
the head gives no indication of the shape of the clypeus, and 
is quite misleading ; the venation, as represented in the figure 
of the wing, is also incorrect in details ; the posterior basal 
cell is complete, though the anterior basal transverse vein is, 
