425 



97 



Basal joint of fore tarsi about one half longer than fore tibiae 



63. cristatus. 



— Basal joint of fore tarsi about four fifths longer than fore tibiae . . . . 



64. serus. 



28. Basal joint of fore tarsi nearly twiee as long as fore tibia (57:29 



and 102 : 55) ; mesonotum opaque 29 



— Basal joint of fore tarsi at most 1.75 times as long as fore tibije ; 



mesonotum generally distinctly shining 30 



29. Thorax pale green, vittae reddish, the spaces between the latter 



densely covered with whitish pruinescence ; abdomen entirely 

 green ; proportions of basal joint of fore tarsi and fore tibiae, 57, 

 29 65. alhoviridis. 



— Thorax greenish j'ellow, vittge deep brown, the spaces between the 



latter slightly pruinescent ; abdomen brown, posterior margins of 

 segments conspicuously yellow; proportions of basal joint of fore 

 tarsi and fore tibife, 102, 55 64. serus. 



30. Second joint of fore tarsi longer than fore tibiae 31 



— Second joint of fore tarsi not longer than fore tibige 32 



31. Pale yellow species ; mesonotum not vittate 52. flavus. 



— Green or greenish yellow species ; mesonotum with the lateral vittae 



darker than median vitta 50. illinoensis. 



32. Cross vein of wing inf uscated 33 



— Cross vein of wing not inf uscated 34 



33. Cross vein veiy conspicuously infuscated ; frontal tubercles distinct 



51. decorus. 



— Cross vein slightly infuscated ; frontal tubercles indistinguishable 



66. digitatus. 



34. Abdomen brown, posterior margins of segments yellowish ; meso- 



notum with opaque brown vittae 62. similis. 



— Abdomen green or yellow ; mesonotum with shining reddish or yel- 



lowish vittae, or not vittate 35 



35. Deep yellow species; abdomen sometimes greenish 58. fidvus. 



— Green species; thorax sometimes yellowish; abdomen always 



green 36 



36. Cubitus forking very distinctly beyond cross vein ... 60. ohscuratus. 



— Cubitus forking very slightly beyond cross vein 



!54. tenuicaudatus. 

 56. modestus. 

 51. indistincius. 



