523 



Thorax yellow or blue, and black ; pronotum blue and black, the 

 cephalic lobe largely blue, the median lobes black with small lateral blue 

 spots and with median spots, but only in very recently emerged speci- 

 mens ; caudal lobe of the pronotum with a small, pale, mesal spot, the 

 remainder black; mesostigmal plate with a pale lateral spot and a 

 smaller spot on the caudo-mesal angle ; dorsal carina lined with blue, 

 on each side of which there is a broad black stripe occupying about half 

 or more of each mesepisternum ; beyond these dorsal stripes on the 

 mesepisterna there are narrow, pale stripes ; mesopleural suture cov- 

 ered by a broad black stripe which extends cephalad onto the mesinfra- 

 episternum and covers one-third of it ; interpleural fold with a black 

 dash near the wing bases ; remainder of the thorax pale greenish yel- 

 low. 



Abdomen black, greenish yellow, and blue ; terga 1-8, inclusive, 

 and ten with black dorsal longitudinal stripes, the stripes widened sub- 

 apically on segments 2-5, inclusive, and narrowed to the meson at the 

 apex of eight ; apical black rings on terga 2-5 and on eight ; lateral sur- 

 faces of terga 1-8, inclusive, with basal interrupted rings except on the 

 first, which has an apical pale yellowish green ring; lateral sur- 

 face of the eighth tergum and all of the ninth blue ; sterna 2-8 with a 

 black ventral mesal line; superior anal appendages (Figs. 202, 209) 

 black, bifurcate, the arms about equal and widely divaricate; the in- 

 feriors shorter, directed obliquely dorsad, mostly buff, the tips black. 



Female. — Color similar to that of the male. 



Head similar to that of the male. 



Thorax similar in color to that of the male ; prothorax with a small 

 spot on each median lobe near the meson, besides the lateral ones, and 

 the mesopleural black stripe more commonly divided by a brown line 

 immediately over the suture. 



Abdomen: terga 1-10 with broad dorsal brown or black stripes, 

 the stripes widened subapically on segments two to six and continuous 

 with a dark apical ring on the same segments ; tergum nine with a nar- 

 row pale line, sometimes diamond-shaped ; lateral surfaces of terga 

 2-7 inclusive, greenish yellow; sterna 1-7 or 1-8 with a black mesal 

 line; eighth sternum with a very long and heavy apical seta and the 

 anal appendages of the usual type; ovipositor including the prostyles 

 not extending caudad of the anal appendages, the ventral margins of 

 the lateral valves serrate; eighth sternites small, triangular. 



Measurements 



Length, S 34 mm. 



Length, 9 32 mm. 



