LONG S SECOND EXPEDITION. 249 



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. 



SCIAKA 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.tlwmsc Fabr. 

 This seems to be very closely allied to S. nigra Wied., an in- 

 habitant of South Carolina, but the thorax in a particular light 

 exhibits a grayish reflection, a character which Wiedemann attri- 

 butes to the antennas only in his species. The antennas are de- 

 ficient 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 antennae; wings dusky, pale yel- 

 lowish at base ; poisers whitish ; feet 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. [367 ] 



3. S. fraterna. — Deep black, polished ; abdomen black-brown, 

 opaque; base of the poisers, and feet pale yellowish. 



Inhabits North-west Territory. 



Antennae dark fuscous, with dense grayish hair; eyes in con- 

 tact above the antennae; thorax polished ; wings dusky, pale yel- 

 lowish at base ; poisers with a yellowish scapus and fuscous capit- 

 ulum ; feet dusky towards the tip; abdomen fuscous, opake. 



£ Length of the body one-tenth of an inch, % smaller. 



4. S. exigua. — Black; thorax piceous at the anterior an 

 poisers whitish at base; feet whitish, dusky at tip. 



