60 STUDIES IN AMERICAN EPHYDRIDAE (dIPTERA) 
Louisiana: Cameron, VIII, 14 to 28, 1903, 1 cf, 4 9, [Ohio]. Slidell,. 
VII, 2 to 6, 1905, 1 d", [Ohio]. 
The typical series contained two males and three females from 
Biscayne Bay and Lake Worth, Florida. There are five males 
and three females in the U. S. Museum collection from these 
localities, so it is impossible to distinguish the original series. 
This species seems to be confined to the southern Atlantic and 
Gulf coasts. 
Synonomy. — I have a suspicion that this may be N. transversa 
Walker, and also N. carinata Coquillett, but I hardly think the 
latter is probable. 
Species described under Notiphila which are not recognized or 
are synonymized m the material studied. 
In the study of a large amount of material which represents 
many species or forms, it is difficult to recognize with certainty 
many of the described species, especially in the groups in which 
the forms are not well marked or are subject to much variation. 
So many of the species, especially of authors who were not well 
acquainted with the family, are poorly or superficially described, 
and it is these which give us the most trouble. In working up a 
revision of a family from such a mass of material as I have been 
studying, it is, in my opinion, poor policy to try to recognize 
species from such poor or insufficient descriptions, if there is any 
doubt involved. The types in such cases, and in fact in all cases 
where possible, should be examined. I have therefore refrained 
from using names of doubtful species. If I am not reasonably 
certain of a described species I prefer to ignore it, until its type 
is examined, and more fully described or noted by an authority. 
I have been unable to examine Loew’s types and so am com- 
pelled to ignore some of his names. When I am able to study 
them the species can then be located among those treated in 
this revision, thus involving but simple synonymy. 
In hopes of being able to fix the status of Walker’s species I 
sent, some time ago, to Mr. E. E. Austen of the British Museum 
of Natural History, some specimens of Ephydridae which seemed 
to agree, or nearly so, with Walker’s descriptions. Air. Austen 
kindly sent me notes on such of Walker’s types as were available, 
and these have been valuable to me. 
Following is a list of such unrecognized species, accompanied 
by notes as to their possible or probable relationships and syn- 
onymy. 
