421 



— Basal joint of fore tarsi slightly less than a fourth longer than fore 



tibiae (98:80); hypopygium with lateral arms very stout (PI. 

 XXXIII, Fig. 13) 34. crassicaudatus. 



37. Apices of femora and bases of tibiee of all legs blackened 38 



— Apices of femora not blackened 39 



38. Pale yellowish green species ; mesonotum with reddish yellow vittae ; 



postnotum almost black, very conspicuous ; abdc^men entirely pale 

 green 35. pallidics. 



— Reddish yellow species ; mesonotum with reddish vittae ; postnotum 



brown, not conspicuously darker than other parts of thorax ; ab- 

 domen yellow on basal half, blackened on apical half 



36. aherrnns. 



39. Small species, about 2.5 mm. in length ; third vein ending distinctly 



farther in front of apex of wing than fourth does behind it ; hypo- 

 pygium as in Figure 2, Plate XXXIV 37. nigrovittatus*. 



— Larger species, more than 3.5 mm. in length ; third vein ending as 



near to apex of wing as does fourth 40 



40. Mesonotum with glossy black or blackish brown vittfe ; legs yellow- 



ish green, fore tibiie, the entire fore tarsi, and the mid and hind 

 tarsi with the exception of basal half of the first joint dark 

 brown 39. viridicollis. 



— Mesonotum with opaque or subopaque reddish or yellowish vittas; 



legs almost entirely yellow or with apices of tibiae and of tarsal 

 joints blackened 41 



41. Basal joint of fore tarsi about a fifth longer than fore tibiee 



(60 : 50) ; hypopygium as in Figure 11, Plate XXXIV 



40. dimorplius. 



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



tibiae 42 



42. CTreen species; apices of tibiae and of basal 2 tarsal joints and the 



whole of apical 3 tarsal joints blackened ; proportions of basal 

 joint of fore tarsi and fore tibiae 50, 35 ; hypopygium as in Figure 

 9, Plate XXXIV '. . . .41. ahortivusi. 



— Yellowish species Avith fuscous abdomen ; legs entirely pale yellow ; 



proportions of basal joint of fore tarsi and fore tibiae, 65, 45; 

 hypopygium as in Figure 1, Plate XXXVI 42. fusciventris. 



43. Third vein ends distinctly farther in front of apex of wing than 



fourth does behind it 44 



— Third vein ends about the same distance in front of apex of wing 



as fourth does behind it 46 



44. Basal joint of fore tarsi shorter than fore tibiae. . .30. pseudoviridis. 



— Basal joint of fore tarsi distinctly longer than fore tibiae 45 



*The speeimens \rhich I describe as females of nigrovittatu.'i have the basal 

 joint of the fore tarsi 1..5 as long as the fore tibiae, or rather more than that, and mav 

 not belong to that species, having been taken in a different locality. 



tCf. .59, parvihimeUaius. 



