long's second expedition. 253 



last segments black on tlie disk ; tergum with blackish hair on 

 the incisures. 



Length nearly eleven-twentieths of an inch. 



This species seems to approach nearest to Wiedemann's fifth 

 tribe, though the additional cellule will justify its being placed 

 apart ; we observed it frequently on St. Peter's river and on 

 Red river. 



2. A. TEGMINIPENNIS. — Black with pale fulvous hair ; wings 

 brownish-black, immaculate. [372] 



Inhabits North-west Territory. 



Head yellowish-white below the antennae ; hypostoma promi- 

 nent, with a few rigid black hairs at tip ; antennae black, basal 

 joint whitish, with black hair ; front dull fulvous ; vertex black ; 

 wings entirely brownish-black, without spot ; feet pale rufous ; 

 tarsi black ; tergum with black hairs at the incisures, which on 

 the side alternate with the fulvous ones, but more distinctly so 

 near the tip. 



Length from nine-twentieths to half an inch. 



This species belongs to Wiedemann's fifth tribe. 



3. A. FULVIANUS. — Black, covered equally with pale yellow- 

 ish hair ; wings hyaline, with a narrow, brown, costal margin. 



Inhabits North-west Territory. 



Head with dull yellowish, short hairs, intermixed with black 

 ones on the front and hypostoma ; thorax densely hairy ; wings 

 hyaline, interval between the two nervures of the costal margin, 

 and base to the first transverse nervure, light brown; feet black, 

 sericeous, with yellowish-fulvous hair, intermixed with black 

 hairs ; tergum covered with dense hair, without any intermixture 

 of black hairs, and without any fasciated appearance ; venter 

 each side behind with hairs of a brighter fulvous tint than the 

 others. 



Length more than nine-twentieths of an inch. 



Allied to A. Jiottentofa Fabr. 



Belongs to the fifth tribe in Wiedemann's arrangement. It is 

 common on St. Peter's river, at Pembina, &c. It is closely 

 allied to altemata nob. in the characters of the wing, but there is 

 no sign of fascia on the tergum, nor of alternating black fascicles 

 of hair on the sides. The color of the hair on the last segments 



