122 PROC. ENT. SOC. WASH., VOL. 23, NO. 5, MAY, 1921 



McAfee, April 2, 6, 1895 (U. S. N. M.). McAfee took 

 numerous specimens also, on Matinicus Id., Maine, Oct. 29, 

 1915, from brine in hogsheads of pickled fish. 



Scatopse varicornis Coquillett. 



Originally described from a specimen collected in the District 

 of Columbia by T. Pergande; no other seen. 



Scatopse tibialis, n. sp. 



Third vein chiefly paralleling costa, joining it at a point more than two-thirds 

 of the distance from root to apex of wing, second vein joining costa a little more 

 than half-way from wing-root to end of third vein; radial crossvein between 4th 

 and last fifths of second vein; anterior branch of fourth vein distinctly angulate 

 at a point somewhat more than one-fourth its length from origin; last vein bent 

 at almost right angles once, then again at a slightly greater angle. General 

 color black; face with bristly black hairs, the head including antennae opaque, 

 the latter (.46-. 52 mm. long) however, with hairs which appear pale in reflected 

 light; thorax shining, somewhat greenish black, with sparse short pale reddish 

 hairs; scutellum opaque dead black; abdomen opaque with vestiture of short 

 pale hairs which in reflected light make the surface appear seal-brown; legs 

 normal in shape, femora black, distal joints more or less pale; femora with fine 

 white pubescence which shows in reflected light, the basal half of each tibia 

 glistening white, this followed by a darker (fuscous to black) annulus broader 

 on each succeeding leg posteriorly, the apex of each tibia and tarsus yellow- 

 brown. Length 1.84 mm. 



Type, a female, Falls Church, Va., June 21, 1914, F. Knab. 

 (U. S. N. M.) Paratype, same sex, Great Falls, Va., May 19, 

 1915, McAfee. A damaged specimen probably also of this 

 species Plummers Id., Md., August 11, 1907, McAfee. 



SWAMMERDAMELLA Enderlein. 



A. Apical cell very short triangular, about one-third the length of its 



stalk ...brevicornis. 



AA. Apical cell relatively longer, but much shorter than its stalk, its sides 



close together basally, but suddenly diverging apically ...pygmaea. 



Swammerdamella brevicornis Meigen. 



A minute species, varying from slightly less to slightly more 

 than 1 mm. in length. Washington, D. C., June 6, 19, 1912, on 

 windows, McAfee; Plummers Id., Md., August 1, 1903, E. A. 

 Schwarz, A. Busck. 



Swammerdamella pygmaea Loew. 



Originally described from District of Columbia material. The 

 type was only .85 mm. long, but other specimens measure up to 

 1.5 mm. Maryland near Plummers Id., May 10, 1914, under 

 bark of honey locust, R. C. Shannon. 



