ART. 12 KEYS TO SAPKOMYZIDAE MALLOCH AND McATEE. 13 



Subgenus Trivialia Malloch. 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



* Deceia {Trivialm) fuscocapitata Malloch.— This species has been 

 taken only once, in Virginia near Pliimmer Island, July 4, 1915, 



McAtee. ,, „ , 



Subgenus Deceia Malloch. 



Type of the subgenus.— Sapromyza crevecoeun Coquillett. 



KEY IX) THE SPECIES. 



3. Ocellar bristles parallel, at least as long as anterior orbitals and much longer 

 than postvertical pair; the longest hairs on upper side of arista shorter 

 than third antennal segment; palpi fuscous; fore tarsi whitish 



yellow crevecoeuri Coquillett. 



Ocellar bristles divergent, much shorter than the anterior orbitals and equal 

 to postvertical pair; longest hairs on upper side of arista as long as third 

 antennal segment ; palpi yellow ; fore tarsi whitish, apical segment in male 

 black, in female brownish wetmorei Malloch. 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



D. crevecoeuri Coquillett.— Has been taken a number of times on 

 Plummer Island, Maryland, from June 30 to August 6 (once at 

 light) ; and at Glen Echo, Maryland, June 25 to August 22. 



Subgenus Melanomyza Malloch. 

 Type of the siihgemis. — Lmi.rania gracUipes Loew. 



KEY TO SPECIES. 



1. Frons without velvety black markings; hairs on upper side of arista barely 



longer than those on under side; antennae extending slightly beyond 

 mouth-margin, third segment at least four times as long as wide; scutel- 



lum without velvety black margin incongrua Malloch. 



Frons with velvety black markings; hairs on upper side of arista much 

 longer than those on under side ; antennae not extending to mouth-margin, 

 third segment not three times as long as wide; scutellum more or less 

 broadly velvety black on posterior margin 2 



2. Frons with a large subquadrate velvety black spot in center anteriorly; 



ocellar triangle very short, not extending to middle of frons, 



gracilipes Loew. 

 Frons with a wedge-shaped black mark on each side of interfrontalia an- 

 teriorly, frontal triangle extending to anterior margin of frons, rather 

 broad anteriorly ; orbits almost glossy, the shining stripe not interrupted 

 between the bristles; scutellum velvety black only on margin, 



intermedia Malloch. 



Frons largely velvety black anteriorly but more conspicuously so on the same 



areas as intermedia, the frons not so distinctly shining on orbits, the 



latter shining only on two small spots surrounding bases of the bristles, 



scutellata Malloch. 



