527 



most of the cephalic lobe blue; proepimera blue, the dorsal border with 

 a broad black stripe ; mesothorax with a blue dorsal carina, the black 

 stripe on each side occupying about half of each supraepisternum ; 

 mesopleural suture covered by a black stripe which is suddenly widened 

 caudad of the inf raepisterna ; dorsal third of the mesepimeron black ; 

 metapleural suture with a black spot adjacent to the wing bases; 

 paraptera black, the cephalic margins blue; remainder of the pleura 

 blue ; postcoxal areas buff ; legs striped black and blue, the coxae largely 

 blue ; trochanters blue, dark above ; femora with black stripes occupy- 

 ing the whole of the dorsum, but not extending ventrad far enough to 

 include either row of setae ; cephalic margins of all femoral black 

 stripes emarginate at the proximal end ; cephalic half of the tibiae black, 

 the stripe including the cephalo-ventral row of setae; tarsi uniform 

 brown, the segments darker at the distal end; wings with 12-13 post- 

 nodal cross-veins in the front wing and 10-11 in the hind; M 2 arising 

 between the fifth and sixth postnodal cross-veins or near the fifth in 

 the front wing, and between the fourth and fifth in the hind ; stigma 

 small, pale brown, and surmounting slightly less than a single cell. 



Abdomen blue and black; terga 1-5 inclusive, blue with the excep- 

 tion of a black spot on the dorsum of one, a subapical dorsal spot and 

 apical ring on two, and apical spots and rings on 3-5 ; caudal half of the 

 dorsum of six and caudal three-fourths of seven, black ; terga eight 

 and nine blue ; tenth tergum black above, pale buff on the lateral mar- 

 gins ; first sternum pale ; sterna 3-8 black ; parameres black and not 

 reaching the apex of the segment; anal appendages short (Figs. 200, 

 207), the superiors blunt, shorter than the inferiors, but without the 

 conspicuous tubercle of civile and carunculatum; inferiors slender, 

 acute and black at the tips. 



Female. — Color, blue, but paler than that of the male. 



Head : the blue of the male is replaced by brown or buff. 



Thorax similar to that of the male, but the blue is frequently re- 

 placed by brown or buff. 



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

 as in the male, spot of the second tergum connected with the apical ring 

 and a line on the meson extending to the base of the sclerite; terga 

 3-6 with narrow dorsal black lines widened suddenly near the apices 

 of the segments and occupying the caudal three-fourths ; seventh ter- 

 gum with a similar but broader dorsal line; caudal half of the dorsum 

 of the eighth, and all of the ninth and tenth black ; lateral margins of 

 all terga pale ; sterna 3-7 black ; one, two, eight, and ten pale ; ovi- 

 positor pale, the lateral valves broad. 



