THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 35 



137. Fore coxae wholly yellow No. 92, indigena, new species. 



Anterior coxae with a blackish spot at base on outer surface. 



No. 101, indsuralis Loew. 



138. Third antennal joint wholly black 139. 



Third antennal joint yellow, at least at base 141 • 



139. Second antennal joint more or less yellow, usually largely so. 



No. 125, flagellitenens Wheeler. 

 Second antennal joint wholly black or nearly so 140. 



140. Bend in last section of fourth vein at basal third; tips of third and fourth veins 



rather widely separated No. 147, compadus, new species. 



Bend in last section of fourth vein a little beyond basal third: tips of third and 

 fourth veins rather close together No. 123, blandns, new species. 



141. Last section of fourth vein with a stump at the bend 142. 



Last section of fourth vein only bent, without a stump 143. 



142. Front shining No. 114, refledus Aldrich. 



Front opaque ^ath pollen No. 126, bifradvs Loew. 



143. Tips of middle tibiae blackish No. 109, hastatns Loew. 



Tips of middle tibiae not at all infuscated 144. 



144. Front violet 14'''- 



Front green 146- 



145. Middle basitarsi with a large bristle above No. 124, vigilans Loew. 



Middle basitarsi without a bristle above No. 127, pugil Loew. 



146. Bend in last section of fourth vein at basal third No. 128, plumipes Scopoli. 



Bend in last section of fourth vein a little before its middle. 



No. 175, ctirolinensis, new species. 



147. Hind tarsi wholly black, or only a little yellowish at base 148. 



Hind basitarsi considerably yellow at base, usually yellow with a black tip . 175. 



148. First antennal joint black, at least on upper edge 149. 



First antennal joint wholly yellow 160. 



149. Middle tarsi wholly black No. 129, dasypodus Coquillett. 



Middle basitarsi yellow with a black tip 150 



150. Front violet or blue 151- 



Front green or bronze color 155. 



151. Coxae yellow, middle pair more or leas blackened on outer surface; middle 



basitarsi with a large bristle above No. 132, flavicoxa, new species. 



Middle and hind coxae black with yellow tips, or with the outer surface largely 

 black .' 152. 



152. Midclle and sometimes hind femora -with two preapical bristles; antennae wholly 



l)lack No. 173, bakeri Cole. 



Middle and hind femora each with one preapical bristle; first antennal joint 

 yellow below 153. 



153. First and second antennal joints yellow with a black line on upper edge. 



No. 113, marginaias Aldrich. 

 Antennae wholly black 154. 



154. Fore tarsi yellow with the fifth joint more or less black, sometimes wholly yellow, 



shorter than fourth; third and fourth veins convergent at tips; middle tibiae 



with one bristle below No. 144, discifer Loew. 



Fore tarsi black from the tip of the first joint, fourth and fifth joints of nearly 

 equal length; third and fourth veins nearly parallel; middle tibiae with one 

 bristle below No. 117, porphyrops, new species. 



155. Middle basitarsi without a bristle above 156. 



Middle basitarsi with a large bristle above 157 . 



156. Fore tarsi yellow, usually with the fifth joint black, fifth joint shorter than fourth; 



third and fourth veins convergent No. 144, discifer Loew. 



Fore tarsi black from the tip of the first joint, still the fifth joint yellowish. 



No. 89, sodus Loew. 



