324 DIPTERA OF NORTH AMERICA. [PART II. 



,o / Antennse black, at the utmost the first joint almost yellowish-red. 14 



I Antennae, altogether or at least their larger portion, yellowish-red. 24 

 14 f Fore coxae dark at the base, beyond the middle. 11 longimanus Lw. 



\ Fore coxae pale. . 15 



,, f Tip of the hind tibise distinctly black. 16 



v Tip of the hind tibise not, or very slightly infuscated. 17 



, fi f Fore tarsi only ferruginous-brownish. 12 brevimanns Lw. 



I Fore tarsi blackened from the tip of the first joint. 13 socius Lw. 



..,. f Hind tarsi entirely black. 18 



\ Basis of the hind tarsi to a considerable extent pale. 22 



, f Hind femora of the male not ciliated. 14 nudus Lw. 



lo < 



I Hind femora of the male ciliated. 19 



The enlarged last joint of the fore tarsi of the male on the outside 

 with a white reflection. 45 palaestricus Lw. 



^ The enlarged last joint of the fore tarsi of the male on the outside 

 without a white reflection. 20 



C Hind femora of the male very densely ciliated. 16 splendidus Lw. 

 <- Hind femora of the male sparsely ciliated. 21 



Hind tibise not infuscated at the tip ; the fourth joint of the fore tarsi 



of the male somewhat broader than the preceding. 

 . 44 splendidulus Lw. 



Hind tibise somewhat infuscated at the tip ; the 4th joint of the fore 

 tarsi of the male not broader than the preceding. 



15 subciliatus Lw. 

 r Only the last joint of the fore tarsi of the male enlarged. 

 22 j 17 batillifer Lw. 



(. The two last joints of the fore tarsi of the male enlarged. 23 



oo ( Hind femora of the male ciliated. 18 eudactylus Lw. 



(. Hind femora of the male not ciliated. 19 tonsus Lw. 



24 ( Last Joint of the fore tarsi of the male enlarged. 20 teuer Lw. 



\ Fore tarsi of the male plain. 25 



2 g f Wings hyaline with a grayish tinge. 21 variabilis Lw. 



I Wings hyaline with a yello.wish tinge. 22 luteipennis Lw. 



2* f Fourth longitudinal vein broken. 27 



I Fourth longitudinal vein not broken. 31 



27 ( Antennse black. 23 ramifer Lw. 



I Antennse yellowish red. / 28 



f Fourth longitudinal vein broken twice at right angles, 

 oo ! 24 bifractus Lw. 



1 The lower angle of the fourth longitudinal vein sharp, the upper one 

 rounded. 29 



2g C Tarsi of the male plain. 25 vittatus Lw. 



\ Fore tarsi of the male enlarged at the tip. 30 



