422 



45. Basal joint of fore tarsi about 1.5 as long as fore tibiae 



37. 7ngrovittatus. 



— Basal joint of fore tarsi about 1.10 as long as fore tibifE. . .38. liarti. 



46. Apices of femora and bases of tibias conspicuously blackened or 



browned 47 



— Apices of at least mid and hind femora and bases of corresponding 



tibiffi yellow 48 



47. Basal 2 segments of abdomen yellow, the others fuscous 



36. aherrans. 



— Abdomen entirely yellowish or greenish 35. pallidus. 



48. Basal joint of fore tarsi about a sixth longer than fore tibias 



29. viridis. 



— Basal joint of fore tarsi distinctly more than a third longer than 



fore tibiffi 49 



49. Mesonotum with glossy black or blackish brown vittaj ; fore tibiae 



and tarsi brown 39. viridicollis. 



— Mesonotum with pale yellowish or reddish vittaj 50 



50. Fore legs yellow, apices of joints of tarsi brownish 



33. stigmaferus. 



— • Fore legs whitish green, apices of tibia?, of basal 2 joints of tarsi, 

 and the apical 3 joints of latter blackened 51 



51. The greater portion of apical half of fore tibiae and the entire ap- 



ical third of basal joint of fore tarsi blackened 32. frequens. 



— Apex of fore tibiae with a narrow black ring ; apical sixth of basal 



joint of fore tarsi blackened 41. ahortivus. 



Subsection 2 



Fore tarsi ivitli hasal joint distinctly more 

 fhan 1.5 as long as fore tihice 



1. Thorax and abdomen black, blackish gray, or brown, abdomen with 



or without pale posterior margins to segments 2 



— Thorax and abdomen green or yellow, the thorax with or without 



reddish or blackish vittae 10 



2. Males 3 



— Females 7 



3. Fore tarsi without long hairs on their posterior surfaces; legs en- 



tirely yellow ; mesonotum shining black 4 



— Fore tarsi with long hairs on their posterior surfaces; legs brown- 



ish or partly fuscous ; mesonotum gray pruinescent 6 



4. Large species, more than 4 mm. in length ; abdomen with pale pos- 



terior margins to segments 43. fuscicornis. 



— Small species, 2.5 mm. in length 5 



5. Abdomen entirely black; fore tibiae yellow 44. Jialteralis. 



— Abdomen yellowish on basal 2 segments ; fore tibiae blackened 



45. nitidellus. 



