AKGYBA. 209 



the tip of the hind pair dusky ; tibiae yellow, hind pair dusky at the 

 tip ; anterior tarsi yellow, with the tip dusky, hind pair dusky. 

 Common. (E. S. I.) 



4. argentata, Mq. d. i. 457. 2 (1834) ; Ztt. argyrea, Mg. Tho- 

 race viridi albo-induto, alulis fusco-ciliatis, capite albicante, Mas. Long. 

 2f ; alar. 5 lin. 



Head silvery -white. Thorax green with a white coat. Alulae edged 

 with black, the fringe brownish, in some lights shifting to pale yellow. 

 Abdomen silvery, with a pale transparent spot at each side of the 

 second, third, and often of the fourth segment. Femora blackish ; 

 tibia? yellow, the hind pair blackish at the tip ; anterior tarsi yellow, 

 dusky at the tip, hind pair dusky. The female is not known with cer- 

 tainty, but probably differs from that of the preceding chiefly by the 

 short arista and yellowish fringe of the alulae, and from that of the 

 following by the fore coxa3 and the tip of the hind femora being dusky. 



.Rare. (E. I.) 



5. argentina, Mg. zw. iv. 47. 3 (1824); Mq. ; Ztt. semiargen- 

 tella, Dnvn. ! Thorace viridi albo-induto, alulis pallido-ciliatis, capite 

 albicante, coxis anticis femoribus tibiisque flams. Long. 2-2|- ; alar. 

 4-5 lin. 



Head white, silvery in male. Antennae of the length of the arista in 

 the male. Thorax green with a white coat. Alula with black edge and 

 pale fringe. Abdomen in male silvery, with a pale transparent spot at 

 each side of the second, third, and often of the fourth segment ; in the 

 female brassy-green, with only the second segment spotted. Tore coxa, 

 the femora, tibia, and base of the anterior tarsi pale yellow, the hind 

 femora often dusky at the tip in the male. 



Common. (E. S. I.) 



6. vestita, W-d. z. m. ii. 75. 24 (1818); Fin.; Mg.; Mq.; Ztt. 

 Firidis, capite albicante, anlennarum articulo primo nudo ; Mas. abdomi- 

 nis segmentis intermediis argenteis immaculatis. Long. 2 ; alar. 4 lin. 



Shining green. Head white. Antennae with the first joint naked, 

 the third joint longer than the arista in the male. Alulae with black 

 edge and pale fringe. Second to JJfth segments of abdomen in the male 

 silvery, without lateral spots, the sixth blackish. Fore coxae, the femora, 

 tibiae, and base of anterior tarsi yellow, hind femora dusky at the tip, 

 sometimes also the fore coxae and the base of the anterior femora of 

 the male. 



Not rare. (E. S. I.) 



7. elongata, Ztt. d. s. 594. 82 (1843). Thorace viridi nitido, 

 alulis nigro-ciliatis, hypostomate albo. Long. 1^ ; alar. 3 lin. 



Shining green. Face white. Antennae of the male with all the joints 

 elongated, and the arista short. Wings with the subcostal vein not 

 elongated as usual in this genus ; the subapical but faintly curved, 

 parallel with the cubital. Alula with a narrow black edge and black 



VOL. i. 2 E 



