566 



broad black stripe which, adjoining the wing bases, is exactly the width 

 of the two mesepisterna together, but contracts suddenly shortly 

 cephalad of this, and again about half-way to the cephalic margin of the 

 mesothorax; mesinfraepisternum with an indefinite black spot on the 

 cephalic border; caudal margins of the mesepimera and metepisterna 

 black, shining, the sclerites themselves pale blue; metepimera lemon- 

 yellow, the cephalic half of the ventral margins frecjuently dark; post- 

 coxal areas yellowish buff, lateral margins of the intersternum darker; 

 legs black and greenish buff, the coxae usually black on the cephalic 

 surfaces ; trochanters black on the dorsum, the femora with a broad, 

 shining black, dorsal stripe, which encircles the segment at the apex 

 and is narrowed basally on the front femora; femoral setae of the 

 front femora, seven and four in the two rows respectively; tibiae 

 pale buff, with a darker stripe on the ventral surfaces between the 

 rows of setae, the tips dark; tarsi shining black; wings with eleven 

 postnodal cross-veins in the front wing and ten to eleven in the hind 

 one ; stigma surmounting a single cell and much longer than broad. 



Abdomen blue and black, the first tergum with a short basal 

 black spot on the dorsum and latero-cephalic angles ; terga 2-6, in- 

 clusive, blue with cephalo-lateral spots of black ; second tergum with 

 an apical shield-shaped spot and an apical ring ; terga 3-6 with dorsal 

 longitudinal stripes, narrowed to a line at the cephalic margins and 

 widened to the lateral margins at the caudal end of the segment; 

 terga eight and nine blue, with narrow lateral stripes on the lateral 

 margins and mesal stripes from the base to the distal fourth and 

 small spots on each side of the distal extremity of the lines; tenth 

 segment entirely black except the small blue spots on the dorsum, one 

 on each side of the meson ; first sternum pale, with a black median spot, 

 2-9 black; anal appendages (Figs. 102,106) black, the superior ap- 

 pendages longer than the inferiors, slightly swollen at the apices, and 

 the mesal surfaces densely hairy; inferiors short, pointed at the tip, 

 the dorsal surface flat, the ventral surfaces convex. 



Female. — Color : the blue of the male is replaced by yellowish 

 buff; the yellow is the same as that of the male. 



Head similar to that of the male. 



Thorax: pronotum curiously modified, the caudal margins of 

 the caudal lobe not continuous (Fig. 170) and the median lobe with 

 a flat lateral projection on each side; proepimera entirely pale; meso- 

 stigmal plates broad, the caudal margins convex, the lateral angles 

 more or less acute, and the latero-caudal margins slightly elevated. 



Abdomen buff and black, the first tergum with a black basal spot 

 and a cephalo-lateral spot on each side ; dorsum of the second tergum 



