26 DIPTERA OP NORTH AMERICA. [PART II. 



f Hind femora of the male with sparse and rather short cilia. 



15 subciliatus, n. sp. 



10 i 



| Hind femora of the male with very long and dense cilia. 



16 splendidus Lw. 



i Only the last joint of the fore tarsi of the male is enlarged. 

 19 1 , 17 batillifer Lw. 



I The two last joints of the fore tarsi of the male are enlarged. 



oy f Hind femora of the male ciliated. 18 eudactylus Lw. 



\ Hind/emora of the male not ciliated. 19 tonsus Lw. 



01 f Last joint of the fore tarsi of the male enlarged. 20 tener Lw. 



\ Fore tarsi of the male plain. 22 



22 / Wings hyaline with a grayish tinge. 21 variabilis Lw. 



\ Wings hyaline with a yellowish tinge. 22 luteipennis Lw. 



oo / Fourth longitudinal vein broken. 24 



I Fourth longitudinal vein not broken. 28 



ox / Antennae black. 23 ramifer Lw. 



I Antennae yellowish-red. 25 



r Fourth longitudinal vein broken twice at right angles. 24 bifractusLw. 

 25 < The inferior angle of the fourth longitudinal vein sharp, the superior 



i- one rounded. 26 



og f Tarsi of the male plain. 25 vittatus Lw. 



\ Tarsi of the male enlarged at the tip. 27 



y. f Hind femora of the male ciliated. 26 cuprums Wied. 



\ Hind femora of the male not ciliated. 27 longipennis Lw. 



/-Antennae red, at the utmost the third joint somewhat or altogether 

 28 ] blackened at the tip. 29 



v Antennas black, at the utmost the first joint partly red. 36 



(Humeral callosity of the same color with the upper side of the thorax. 

 30 

 Humeral callosity yellowish. 35 



on f Arista much enlarged towards the tip in the male. 28 hastatus, n. sp. 

 I Arista of the male not enlarged. 31 



, f Last joint of the fore tarsi not enlarged in the male. 32 



< Last joint of the fore tarsi enlarged in the male. 33 



oo f First joint of the male middle tarsi feathered. 29 plumipes Scop. 

 I First joint of the male middle tarsi not feathered. 30 fulvipes Lw. 

 r Last joint of the male fore tarsi with a lamelliforrn appendage. 

 33 -j 31 sexarticulatus, n. sp. 



( Last joint of the male fore tarsi without lamelliform appendage. 34 



04 / Last joint of the male fore tarsi small. 32 ruficornis Lw. 

 I Last joint of the male fore tarsi large. (40 lobatus Lw.) 



05 f Fore tarsi of the male plain. 33 scapularis Lw. 

 \ Fore tarsi of the male enlarged at the tip. 34 funditor Lw. 



og f Face dark golden-yellow. 35 chrysostomus Lw. 



I Face not golden-yellow. 37 



