APPENDIX. 369 



tip, posterior tibiae fuscous at tip ; tergum black-brown, in- 

 cisures and lateral edge yellowish ; venter pale yellowish, 

 dusky at base. 



Length to the tip of the wings one-fourth of an inch. 



This species seems to be allied to the tibialis of Europe, 

 but the posterior tibia are not very obviously clavated, the 

 central cellule of the wings is destitute of the small abbre- 

 viated nervure, and the inferior of the three nervures 

 which radiate from this cellule issues out very nearly 

 from its base, and not from the inferior middle as in that 

 species. 



ODONTOMYIA, Meig. Latr, 



0. vertebrata. Black ; abdomen white, with dorsal black 

 spots. 



Inhabits North-west Territory. 



Mouth deep black, pale within ; hypostoma with an 

 elevated testaceous knob ; antennse deep black, terminal 

 joint beneath dusky testaceous; thorax blackish, with 

 hardly perceptible hairs ; scutel dull testaceous, black at 

 base; tip a little hairy ; spines horizontal, white; wings 

 white ; poisers white, with a whitish-glaucous capitulum ; 

 feet yellowish-white ; abdomen subquadrate, much de- 

 pressed, white ; tergum with a series of large black spots 

 almost connected together. 



Length % rather more than three-tenths of an inch. 



COENOMYIA, Latr. Meig. 



C pallida. Wings and abdomen yellowish-testaceous: 

 thorax ferruginous. 



Inhabits near St. Peter's river. 



