AKT. 12 KEYS TO SAPKOMYZIDAE MALLOCH AND McATEE. H 



3. Wings entirely or almost entirely fuscous ; thorax with a medium brown 



vitta dolorosa Williston. 



Wings with the cross-veins and costal and apical margins fuscous; thorax 

 yellow maculipennis Malloch. 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



C. verticalis Loew. — Much rarer than vulgaris; Woodridge, Dis- 

 trict of Columbia, August 22, 1915, J. Silver; Beltsville, Maryland, 

 June 9, 1915, August 14, 1914, McAtee. Has been taken in Illinois 

 in sandy regions along the Mississippi River and we have also seen 

 it from Florida, 



C. vulgaris Fitch. — The commonest species of the family in North 

 America, occurring throughout our region in woodlands; extreme 

 dates of collection; May 20 and October 12: comes to light; occa- 

 sionally on flowers. P. I. 



Genus XENOCHAETINA Malloch. 



Getieric charojcters. — Similar in general habitus to Galiope^ but the 

 base of the second wing-vein has one or two small setulae on upper 

 side. The fore femur has a comb of minute setulae beyond middle 

 on anteroventral surface as in many species of Sapromyzosoma. 



Genotype. — Lauxania muscaria Loew. 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



X. muscaiia Loew. — Common in the Piedmont region ; the season 

 as at present known extends from May 14 to October 16. P. I. 



Genus TRIGONOMETOPUS Macquart. 



A key to the species of this genus appeared in 1923.^ 



LIST OF SPECIES OF THE DISTRICT OF COLUMBIA REGION. 



T. vittatus Loew.— Stubblefield Fall, Virginia, October 23, 1921, 

 Malloch. 



Genus NEOGRIPHONEURA Malloch. 



Generic characters. — Frons concave on anterior half in center, 

 viewed from above the anterior margin has a rounded central emar- 

 gination; ocellar bristles minute, very much smaller than the post- 

 vertical pair; anterior orbital bristles long and strong, directed 

 slightly mesad and caudad; eyes tapered below; face slightly convex, 

 the lower margin a little protuberant; mouth with a slight rim; 

 arista plumose above, short haired on apical half below ; sternopleu- 



' rioc. Ent. Soc. Wash., vol. 25, p. 48, 1923. 

 45554— 25— Proc.N.M.vol.65 26 



