552 



spot and a smaller one mesad of it; caudal lobe with a yellow caudal 

 margin ; proepimera yellow, with very little black or brown ; mesostig- 

 mal plates subtriangular, yellow, with a small brown spot near the mesal 

 margin, the caudo-mesal angles slightly elevated, dorsal carina covered 

 by a broad black stripe, the lateral margins of which fade into brown; 

 black stripe of the mesopleural suture reduced to an indefinite pale 

 brownish area near the middle of the horizontal portion of the suture; 

 black spots adjacent to the dorsal margin of the mesinfraepisterna 

 and small spots just cephalad of the wing bases; dorsal third of the 

 mesinfraepisterna marked with small, crescentic, black spots; meta- 

 pleural sutures with small black spots just cephalad of the wing bases; 

 remainder of the mesopleura yellow ; paraptera black with yellow 

 cephalic margins and pale spots ventrad of the lateral angles; legs 

 mostly yellow, the coxae and trochanters pale, the femora with a 

 faint dorsal line, the tibiae with a faint indefinite dorsal line or row 

 of dashes, and the tarsi and claws tipped with brown ; wings with 

 nine to eleven postnodal cross-veins and with M 2 arising between the 

 fourth and fifth postnodal veins in the front wing and between three 

 and four in the hind wing. 



Abdomen yellow and black, the dorsum of terga 1-8, inclusive, 

 with black longitudinal stripes from near the base to the apex of 

 each; lateral stripes on terga 1-7, narrow basal rings on 3-7, and a 

 very narrow apical ring on the first tergum, yellow; all of the ninth 

 and tenth terga blue except a narrow mesal line on the tenth ; sterna 

 3-8 with a mesal line of black; anal appendages (Figs. 186, 193) 

 brown, the superiors much longer than the inferiors, broad at the 

 apices, and with the caudo-dorsal and caudo-ventral angles folded 

 mesad; inferiors small and yellow, the black apices directed mesad. 



Female. — Color, lemon-yellow or very pale blue, and black. 



Head similar to that of the male. 



Thorax of slightly paler tint than in the male ; mesostigmal plates 

 (Fig. 225) with a large lateral black spot, the lateral margins rounded, 

 and the plates contiguous with the mesinfraepisterna. 



Abdomen yellow and black, the terga similar to those of the 

 male with the exception of nine and ten, which are usually yellow, 

 the ninth having a triangular black spot at the base ; sterna 2-8 with 

 a mesal line of black, the eighth with a long seta at the apex; lateral 

 valves of ovipositor yellowish, serrate on the ventral margins, the 

 prostyles brown. 



Measurements 



Length, $ 34 mm. 



Length, 9 •• 34 mm. 



