E. T. CRESSON, JR. 
33 
abdominal markings are nearly shining, very dark brown or 
nearly black, not overcast with pollen, but are never distinctly 
shining. This species is rather unique in that the sexes are not 
as easily determined as are the other species, on account of the 
similarity of the fifth abdominal segments of the two sexes, and 
there are no other secondary sexual characters that I can find. 
Description . — d'. Black; antennae and palpi tawny; bases and apices of 
tibiae and all tarsi more yellowish; halteres yellow; ^-ings yellowish hyahne 
with yellow veins; tarsal fascicle black. 
Opaque; general color olive to buffy-olive becoming gray below. Thorax 
immaculate, evenly colored or with spot on lateral margin of mesonotum and 
large spot or stripe on mesopleura, browm; no irrorations. Abdomen more or 
less shining, especially the dark brown markings which are rather elongate and 
in four series, well separated, but not attaining apical margins; hairs and 
bristles, especially on apical margins, emitted from brown dots. 
Frons much broader than long, in profile obliquely flattened; orbits parallel. 
Face slightly narrower, longer than broad, in profile flat above, convex below, 
or in general, weakly convex; foveae and carina weak; parafacials hnear, 
scarcely dilating below; fom’ stout bristles on lower half. Cheeks narrow, 
scarcely equalling third antennal joint in ^\'idth. Antennae small with stout 
thorn; third joint nearly three times as long as second, subconical; arista long, 
with twelve to fourteen long hairs. Scutellum flat, broad apically. Abdomen 
ovate with subequal segments. Middle femora and tibiae weakly, if at all, 
ciliate; latter with three extensors. Wings narrow; second costal section one 
and a half to two times as long as third. All bristles long and stout. Length. 
— 3.5 to 5 mm. 
$ . Similar, excepting for femoral ciliation. 
Described from Europe. The above description is based on 
the series examined as given below. 
Specimens Examined . — 3 0^,119. 
Massachusetts; Nantucket, VII, 20, 1910, 2 9, [B. S. N. H.]. 
New York: Ithaca, 1 cf, 1 9 , [C. U.]. 
New Jersey: Salt IMeadows, VIII, (Wiedt), 2 9, [Harbeck]. 
Georgia: Billy’s Island, Okeefenokee Swamp, VI, 1912, 1 d, [C. U.]. 
Prairie, Honey Island, Okeefenokee Swamp, VI, 1, 1912, 1 d, [C. U.]. Thal- 
man, IV, 28, 1911, 1 9 , [C. U.]. 
Ohio: Cincinnati, VII, 9 to 16, 1901, 1 9, [Ohio]. Kent. VI, 18 to 22, 
1900, 1 9, [Ohio]. Sandusky, Cedar Point, VII, 8, 1901, 1 9, [Ohio]; VII, 18 
to 20, 1904, 2 9 , [Ohio]. 
Variations . — There is some little variation in size, in which 
respect the species contains the largest specimens I have seen 
belonging to the genus. The species intergrade nicely with 
erythrocera. The American specimens may vary slightlj’- from 
TRANS. AM. ENT. SOC., XLIII. 
