THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 19 



36. Anterior coxae and basal part of fore femora black (western), 



No. 62, amnicola Melander and Brues. 



Fore coxae yellow with a large black or green stripe on outer posterior edge, 



which is wide above and pointed below 37. 



37. Last four joints of middle tarsi a little compressed (Washington). 



No. 182, aldrichii Wheeler. 

 All tarsi normal (widespread) No. 165, penicillatus, new name. 



38. Middle tarei wholly black (widespread) No. 129, dasypodus Coquillett. 



Middle basitarsi largely yellow 39. 



39. Hind basitarsi yellow with black tip; hind margin of wing notched at end of 



fifth vein (North Carolina) No. 175, carolinensis, new species. 



Hind tarsi wholly black, at most slightly yellowish at extreme base 40. 



40. Fore tarsi black from the tip of the first joint (Illinois; Connecticut; New York). 



No. 96, defectus, new species. 

 Fore tarsi vnth the first two, or last joint yellow, sometimes wholly yellow. . . 41. 



41. Arista nearly apical; hypopygial lamellae large, twice as long as wide (Massachu- 



setts) No. 95, acutus, new species. 



Arista inserted near the middle of third antennal joint; lamellae moderately 

 small, one and one-half times as long as wide 42. 



42. Hypopygial lamellae rather small, with about six rather stout hairs on upper edge; 



fore tarsi wholly yellow (New York; Vermont)... No. 93, idoneus, new species. 



Hypopygial lamellae moderately large, without hairs on upper edge, except 



those on rounded apical edge; last three joints of fore tarsi black (Ontario; 



Regina; Wyoming) -No. 94, canadensis, new species. 



43. Arista enlarged at tip; wing with a lobe at tip of sixth vein 44. 



Arista plain 45. 



44. Hypopygial lamellae large; hind margin of wing with a deep sinus before the lobe 



(Washington) No. 109, hastatus Loew. 



Hypopygial lamellae small; hind margin of the wing normal, except for the 

 iobe at anal angle (California) No. 110, comptus, new species. 



45. Fore tarsi ornamented 46 , 



Fore tarsi plain 52. 



46. Front and dorsum of thorax thickly pollinose; bend in last section of fourth vein 



furnished with a stump (widespread) No. 126, bifractus Loew. 



Front shining; last section of fourth vein only bent, without a stump 47. 



47. Third antennal joint wholly black 48. 



Third antennal joint largely yellow 50. 



48. Fifth joint of fore tarsi large, nearly orbicular, twice as long as third and fourth 



taken together (eastern) No. 125, flagelHtenens ^Tieeler. 



Fifth joint of fore tarsi moderjitely large, as long or a little longer than third and 

 fourth joints taken togettier 49. 



49. Fore tarsi infuscated almost to their base, second joint about half as long as first, 



third and fourth joints together nearly as long as fifth; hind tibiae narrowly 

 but sharply black at tip (Colorado; New Mexico). .No. 149, spmosus, new species. 

 Fore tarsi with the first two joints yellow, second three-fourths afe long as first, 

 third and fourth taken together three-fourths as long as fifth; hind tibiae black- 

 en etl for more than one-third their length, the black shading into the yelloA\- 

 (Montana; Colorado; Utah) No. 123, blandus, new species. 



50. Front green; hind tibiae black at tip, gradually becoming yellow, still largely 



infuscated; fore tarsi with the fifth joint scarcely dilated (New York). 



No. 112, abrasus, new species. 



Front violet; fore tarsi with fifth joint considerably dilated; hind tibiae narrowly 



hut sharply black at tip, at leaet on inner side 51. 



