THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 33 



103. Middle basitarsi with a large bristle above No. 133, variabilis Loew. 



Middle basitarsi without a bristle above 104. 



104. Middle tibiae with one bristle below; tips of all the joints of the fore tarsi black- 



ened No. 178, celeripes, new species. 



Middle tibiae with one or more bristles below; fore tarsi mostly yellow. (We have 

 no females of these species, but they would prob-jNo. 190, tener Loew. 

 ably go in here) iNo. 135, luteipennis Loew. 



105. Tips of hind tibiae black 106. 



Hind tibiae wholly yellow or nearly so, sometimes blackened at tip on inner 



side 147 . 



106. Tips of hind femora, at least a little blackened on upper edge 107. 



Hind femora wholly yellow 114. 



107. Anterior coxae yellow, at most with a small blackish spot at base on outer sur- 



face 108. 



Anterior coxae considerably blackened at base, sometimes mostly black, at least 

 with a large black spot at base on outer side 109. 



108. Middle and hind femora each with one preapical bristle.. No. 79, comatus Loew. 

 Middle and liind femora each with two or three preapical bristles. 



No. 78, trisetosus, new species. 



109. Anterior femora brownish on the upper edge (rarely this is faint). 



No. 71, affluens, new species. 

 Fore femora not darker on upper edge 110. 



110. Last section of fourth vein nearly straight, with only a very small bend, which 

 ^ is close to its middle No. 74, sincerus, var. subdirectus, new variety. 



Last section of fourth vein with a small but distinct bend, which is before its 

 middle 111. 



111. First antennal joint yellow below No. 72, discolor, new species. 



Antennae wholly black 112 



112. Fore coxae almost wholly blackish No. 73, sincerus Melander. 



Fore coxae with a rather large blackish spot on outer side 113. 



113. Tips of hind femora black for a distance equal to the length of the preapical 



bristle, the black extending to the lower edge or nearly so. 



No. 75, genualis, new species. 

 Tips of hind femora with a small black spot on upper edge. No. 80, virga Coquillett. 



114. Middle and Mnd tarsi wholly black 115. 



Middle basitarsi largely yellow 116. 



115. Antennae black with the lower part of the first joint yellow. 



No. 129, dasypodus Coquillett. 

 Antennae yellow, tliird joint blackened on apical lialf. 



No. 130, uxorcula, new species. 

 First two antennal joints yellow, third black No. 128, plumipes Scopoli. 



116. Antennae black, first and second joints sometimes yellow below 117. 



First antennal joint wholly yellow 138. 



117. Front blue or violet, sometimes almost black 118. 



Front green or bronze color 123. 



118. Last section of fourth vein with a stump at its bend 119. 



Last section of fourth vein only moderately bent, without a stump 120. 



119. Middle tibiae with one bristle below, placed near the middle of lower anterior 



edge; antennae mostly black No. 100, ramifer Loew. 



Middle tibiae with three bristles below, two near apical, one near basal third; 

 first two antennal joints yellow with a narrow black line above. 



No. 114, reflectus Aldricli. 



