366 APPENDIX. 



dusky at tip and on the posterior thighs near the knees, 

 tergum 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 antennae in my specimen are 

 deficient. Found on the coast of Lake Superior in a thick 

 growth of bushes. 



SCIARA, Meig. 



( 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. thomsc, 

 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 antennae only in his 

 species. The antennae 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 seri- 

 ceous ; eyes without interval above the antennae ; wings 

 dusky, pale yellowish at base: poisers whitish; Tee/ dusky 

 towards the tip ; coxae and thighs yellowish-white. 



9 Length of the body less than three-twentieths of an inch. 



The abdomen and thorax are both highly polished. 



