22 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



26. Hind femora ciliated on lower inner edge (Alaska; Europe). 



No. 119, pluviitarsis Fallen. 



Hind femora mthout cilia 27. 



27. Front green or bronze colored 28. 



Front violet 37. 



28. Fifth joint of fore tarsi longer than fourth 29. 



Fifth joint of fore tarsi shorter than fourth 35. 



29. Fifth joint of fore tarsi only a little enlarged (Western States). 



No. 197, coquilletti Aldrich. 

 Enlargement of fifth joint of fore tarsi conspicuous 30. 



30. First and second joints of fore tarsi of equal length 31. 



Second joint of fore tarsi shorter than first 32. 



Second joint of fore tarsi a little longer than first 34. 



31. Third joint of fore tarsi one-fonrth as long as second (Colorado; Wyoming). 



No. 152, seratus, new species. 



Third joint of fore tarsi half or more than half as long as second (Rocky Mountain 



region). No. 150, procerus, new species. 



32. Fore tarsi about one and three-fourths times as long as their tibiae (Oregon). 



No. 147, compadv^, new species. 

 Fore tarsi about one and a fourth times as long as their tibiae 33. 



33. Third joint of fore tarsi yellow; wing without an enlargement at tip of first vein 



(Colorado; Manitoba) No. 148, walkerii, new species. 



Third joint of fore tarsi black; wings with a small but distinct enlargement at tip 

 of first vein (New Mexico; Colorado) No. 149, speciosus, new species. 



34. Fore tarsi about one and two-thirds times as long as their tibiae; fore coxae with a 



transverse, preapical, black line; scutellum slightly margined with yellow 



(Colorado) No. 118, jugalis Tucker. 



Fore tarsi scarcely one and one-half times as long as their tibiae , third joint one- 

 fourth as long as second; fore coxae without a black line; scutellum wholly 

 metallic green (Rocky Mountain region) No. 150, procerus, new species. 



35. Third joint of fore tarsi much longer than fourth (Massachusetts; Minnesota). 



No. 146, angustatus Aldrich. 

 Third and fourth joints of fore tarsi of about equal length 36. 



36. First four joints of fore tarsi yellow (Alaska; New York; Canada; Europe). 



No. 144, disdfer Stannius. 

 First two jojints of fore tarsi infuscated (Labrador). ..No. 145, boreus, new species. 



37. Fifth joint of fore tarsi much longer than fourth (eastern). 



No. 117, porphyrops, new species. 



Fifth joint of fore tarsi about one-fourth as long as fourth (New York; Alaska; 



Canada; Europe) No. 144, discifer Stannius. 



38. Hind femora wdthout cilia 39. 



Hind femora ciliated on lower inner edge 42. 



39. Middle tibiae with a row of extremely long bristles, theii' basitarsi also ^vdth a 



row of very long hairs (widespread) No. 79, comattLs Loew. 



Middle tibiae and basitarsi normal, without such bristles and hairs 40. 



40. Tips of hind femora black; front violet (New Hampshire; Washington). 



No. 73, sincerus Melander. 

 Tips of hind femora not or scarcely infuscated; front green 41. 



41. Second antennal joint wholly yellow; metallic color of mesonotum dulled with 



thick yellowish gray pollen (New Mexico) No. Ill, dorsalis, new species. 



Second antennal joint wholly black; mesonotum shining (Ontario; Regina; Wyo- 

 ming) No. 94, canadensis, new species. 



42. Front green (New Jersey; New York; North Dakota)... No. 101, incisuralis Loew 

 Front blue or viblet 43 



