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APPENDIX.
dusky at tip and on the posterior thighs near the knees j terguni with blackish bands.
Length of the body nearly one-fifth of an inch.
A very pretty species; the wing nervures are like those of M. fasciata, Meig. The antennas in my specimen are deficient. Found on the coast of Lake Superior in a thick growth of bushes.
SCIARA,Me^.
(Molobrus, Latr.)
1, S. atrata. Entirely deep black, polished, immaculate; wings dusky, iridescent; nervures dark fuscous; poisers black; thorax in a particular light somewhat pruinose; abdomen opaque, with short black hairs; spines of the tibia rather longer than the transverse diameter of the tibia. Inhabits North-west Territory.
% Length to tip of wings less than one-fifth of an inch. The nervures of the wings agree with those of S. thomw, Fabr. This seems to be very closely allied to S. nigra, Wied. an inhabitant of South Carolina, but the thorax in a particular light exhibits a grayish reflection, a character which Wiedemann attributes to the antennas only in his speeies. The antenna? are deficient in my specimen.
2. S. polita. Deep black, polished; poisers whitish; feet yellowish at base.
Inhabits North-west Territory.
Body with numerous short hairs, which are slightly sericeous ; eyes without interval above the antennas; wings dusky, pale yellowish at base;poisers whitish;feet dusky towards the tip; coxse and thighs yellowish-white.
9 Length of the body less than three-twentieths of an inch. T"he abdomen and thorax are both highly polished.