oe 
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of second joint of antennie, cheeks one-ninth as wide as the eye 
height, vibrisse slightly below the level of front edge of oral 
margin, ridges bristly on the lowest third, antennie almost as 
long as the face, the third joint five times as long as the second, 
arista thickened on the basal fourth, the penultimate joint shorter 
than broad; thorax gray pollinose, marked with four black 
vittwe, scutellum bearing: three pairs of marginal macrochiete 
and a short apical pair, abdomen opaque gray pollinose, each 
segment bearing marginal macrochete, middle tibive each hay- 
ing a Single one on the front side near the middle; wines hya- 
line, third vein bearing from three to six bristles near its base, 
fourth vein beyond the bend strongly arcuate, calypteres whit- 
ish; length, 9 mm. Missouri. Two female specimens. Type 
No; 3609. U. S. National Museum-...2.-. 2-4... sternalis N. Sp. 
“JESUITS AI On Ales a ne ene a are eee 3. 
Palpi usually black, fourth segment of abdomen and apex of scutel- 
lum yellow; middle tibize each bearing a single macrocheta on 
the front side near the middle, third vein bearing two or three 
bristles near the base; black, apex of scutellum and of fourth 
segment of abdomen, also sometimes the palpi, yellow; front 
of male one half, of the female four-fifths, as wide as either eye; 
two pairs of orbital bristles in the female, none in the male; 
frontal bristles descending nearly to apex of second joint of 
antenne, cheeks one-sixth as wide as the eye height, vibrisse 
on a level with the front edge of oral margin, three bristles 
above each, antennze almost as long as the face, the third joint 
in the male three and one-half, in the female two and one-half, 
times as long as the second, arista thickened on the basal two- 
fifths, the penultimate joint as broad as long; thorax gray polli- 
nose, marked with four black vittiwe, scutellum bearing four 
marginal pairs of macrochete; abdomen on the second and 
third segments gray pollinose and with darker reflecting spots, 
bearing only marginal macrochetie; wings hyaline, fourth vein 
beyond the bend strongly arcuate, calypteres white; length, 6 
mm. Cape Cod, Mass., and Piney Point, Md. A specimen of 
each sex; the male bred October 7, 1589, from a species of Phy- 
ciodes. Type No. 3610, U.S. National Museum. . phyciodis n.sp. 
3. Middle tibiz each bearing a single macrocheta on the front side 
IDE CE TS) TANTO IS RI ec ia ee cal A ee eg RL SURE 5. 
Middle tibize each bearing three or more macrochietze on the front 
side near the middle, apex of abdomen black......--...-.... 4, 
4, Abdomen destitute of discal macrochetie on the second and third 
segments, the fourth wholly covered except on the base, none of 
the macrochetze on this segment more than three-fourths as 
long as those on the third; apex of scutellum broadly yellow, 
third vein bearing two bristles at its base; length, 9 to 11 mm. 
