549 



postclypeus largely black, the anteclypeus and the labrum shining 

 yellow; exposed portions of the mandibles, their trochantins, genae, 

 and a transverse stripe dorsad of the clypeus yellow; remainder of 

 the front black; the oval postocular spots and the narrow transverse 

 stripe caudad of the ocelli green; occiput and postgenae pale; com- 

 pound eyes dark brown. 



Thorax black, blue, and yellowish green ; pronotum dull black, 

 the cephalic lobe, a small spot near the lateral margin of each median 

 lobe, and the caudal margin of the caudal lobe yellowish green; pro- 

 epimera pale, the noto-epimeral sutures indistinct ; mesostigmal plates 

 with a pale lateral spot; paraptera black; mesothorax with the usual 

 dorsal stripe, a broad pale stripe on each supraepisternum, and a black 

 stripe covering the mesopleural suture, extending over the infraepi- 

 sternum, and covering about one-third of that sclerite; remainder of 

 the thorax, including the postcoxal areas, yellowish green or blue with 

 the exception of a small dark spot on the metapleural suture just 

 cephalad of the wing bases; legs black and yellow, the coxae and 

 trochanters pale, the femora each with a broad black dorsal stripe 

 from base to apex, and the tibiae with a similar stripe on the cephalic 

 surfaces, which frequently includes one of the rows of setae; tarsi 

 and claws brown, black at the apices ; wings with ten postnodal cross- 

 veins in the front wing and about eight in the hind one; Mo arising 

 between the fourth and fifth postnodal cross-veins in. the front wing 

 and between the third and fourth in the hind wing. 



Abdomen blue and black; terga i-io blue except a small black 

 basal spot on the first, an apical spot and marginal ring on the second 

 to the fifth, the apical half or two fifths of the dorsum of the sixth, 

 the dorsum of the seventh except a narrow interrupted basal ring, 

 and the dorsum of the tenth, which are black; anal appendages (Figs. 

 161,162) short, the inferiors subcorneal, the superiors slightly shorter, 

 broad and flat, subquadrangular when seen from above, pointed, and 

 similar in appearance to the inferiors when seen in lateral profile. 



Female. — Color, yellowish green and black. 



Head similar to that of the male. 



Thorax also like that of the male; the mesostigmal plates (Fig. 

 221) are characteristic, being short and broad and having the caudo- 

 lateral angles distinctly elevated ; the blue of the male thorax is usually 

 replaced by a yellowish green. 



Abdomen black and yellow; terga i-io black except the lateral 

 surfaces and an apical ring on the first, lateral surfaces of 2-10, and 

 interrupted basal rings on 3-6 inclusive, which are pale blue or green- 



