E. T. CRESSON, JR. 
27 
STUDIES IN THE AMERICAN EPHYDRIDAE 
(DIPTERA) 
II. A REVISK3N OF THE SPECIES OF THE GENERA 
NOTIPHILA AND DICHAETA 
BY EZRA T. CRESSON, JR. 
In the study of the cosmopolitan genus Notipkila the student 
will encounter some difficulty in trying to separate a few of the 
species, and it will soon become evident that a thoroughly ex- 
haustive study will be necessary to establish their limits. The 
material upon which this paper is based contains over five hun- 
dred and fifty specimens, and is separable into twenty-thi’ee 
forms, which are given specific rank, although I recognize that 
some may be merely varieties or subspecies. iMany of the forms 
are distinguished by characters which one would expect to find 
subject to variation, but the series representing these are very 
constant in such characters. 
The present paper is, and must be, preliminary, but will serve 
as a foundation for a more exhaustive treatment when additional 
material can be studied. Introductory remarks, acknowledg- 
ments and general explanations will be found in the first paper 
of this series.^ 
I will add here that all material examined from Costa Rica 
was collected b}'^ Dr. Philip P. Calvert, and is in the collection of 
the Academy of Natural Sciences, Philadelphia, unless noted to 
the contrary. It will, therefore, be unnecessary to mention this 
fact in the lists of specimens examined. 
NOTIPHILA Fallen 
1823. Notiphila Fallen, Dipt. Suec. Hyclromyz., 7. 
This is the type-genus of the Notiphilinae and forms with Di- 
chaeta and Paralimna the group Notiphilae. This group is char- 
acterized by having erect extensor bristles on the middle tibiae. 
* Trans. Amer. Ent. Soc., xiii, 101 to 124, (1916). 
TRANS. AM. ENT. SOC., XLIII. 
