12 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65 



rum with one strong bristle ; area of mesonotum between dorsocentral 

 and supra-alar bristles bare; hypopygium small ; costa as in Minettia. 

 Genotype. — Sapromyza sordida Wiedemann. 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



N. sordida Wiedemann. — Dead Run, Virginia, August 3, 1915, 

 V. A. Roberts. This species is represented also in material examined 

 by us from Sebastian and Paradise Key, Florida, and Knoxville, 

 Tennessee. It was originally described from the West Indies, and 

 has been recorded from Porto Rico, St. Vincent, and Georgia in ad- 

 dition to the above. It is represented in the United States National 

 Museum collection by specimens from Lake Worth, Florida, Texas, 

 and Nicaragua. 



Genus DECEIA Malloch, 



Generic cJiaracters. — Differs from Minettia in having one sterno- 

 pleural bristle, and two pairs of dorsocentrals, and the intra-alar 

 absent. All tibiae with a preapical dorsal bristle. From Laiwam- 

 eJla it differs in having the basal antennal segment very much shorter 

 than the second and bare at apex below, and third not four times as 

 long as its greatest width except in incongi'^ua. 



This genus is divisible into four subgenera, as indicated in the key 

 given below. The genus contains some species which appear to be 

 related to other genera about as closely as they are to the typical 

 species and in the future when material from other faunal regions 

 is carefully studied it may be necessary to recognize as valid genera 

 the groups now accepted as subgenera. 



KEY TO SUBGENEBA. 



1. Frons distinctly longer than wide, rounded in profile ; face and frons opaque ; 



fore tibia of males distinctly and rather abruptly swollen from near base 

 on dorsal surface; eyes narrowed below; upper side of arista with lonjier 



hairs than lower side Deceia Malloch. 



Frons not longer than wide or if so not rounded in profile and the characters 

 not otherwise as above 2 



2. Frons longer than wide, flat in profile and opaque; face subopaque; eyes 



distinctly narrowed below Neodeceia Malloch. 



Frons either not longer than wide or the face is distinctly glossy 3 



3. Eyes distinctly narrowed below ; frons more or less shining, but not uni- 



formly so; face glossy, distinctly convex Nelanomyza Malloch. 



Eyes not narrowed below ; frons uniformly subopaque ; face almost flat, 

 slightly shining Trivialia Malloch. 



Subgenus Neodecia Malloch. 



This subgenus is represented by but one species in the fauna of the 

 United States. It does not occur within our region, being confined 

 to Florida and Cuba so far as known. 



Type of the subgenus. — Lauirania cineracea Coquillett. 



