513 



ventrad where it meets a short transverse black line at right angles; 

 clypeus and labrum, front and vertex, thinly pilose, the setae whitish ; 

 compound eyes slate-colored. 



Thorax brown or purple and black ; pronotum with black caudal 

 lobe ; median and cephalic lobes also black, the median lobes each with 

 a small lateral brown spot; proepimera brown, with a broad black 

 stripe above ; mesostigmal plates black ; dorsal carina covered by a black 

 stripe, the lateral halves of the stripe covering about one-fifth of each 

 mesepisternum, the stripes widened at the caudal and cephalic ends 

 and covering the stigmal plates and paraptera ; mesopleural suture cov- 

 ered with a broad black stripe which is frequently forked near the wing 

 bases, extends cephalad, and covers all of the mesinfraepisterna except 

 the caudo-ventral angles and one-third of each mesepimeron ; 

 metapleural suture with a narrow line of black, the metepisterna and 

 epimera brown or buff ; postcoxal areas buff, but frequently with darker 

 lateral margins and a pair of median spots on the intersternum ; legs 

 mostly black, the coxae yellowish, with black cephalic surfaces, the 

 femora black with the exception of the dorsal carinae which sometimes 

 have a pale stripe ; tibiae with a paler dorsal line ; tarsi and claw^s black ; 

 anterior femoral setae eight or nine in the cephalic row, two large and 

 usually two small ones in the caudal row; wings clear, the postnodal 

 cross-veins twelve to thirteen in the hind wing and fifteen to sixteen 

 in the front; Mo arising between the seventh and eighth postnodal 

 cross-veins in the front wing and between the sixth and seventh in the 

 hind wing. 



Abdomen black, wath sulphur-yellow and blue; terga i-8, inclu- 

 sive, black, the yellow confined to lateral spots, narrow basal rings on 

 2-7, an apical ring on one, and narrow lines on the lateral margins of 

 terga 2-^ which extend about one-half the length of each segment from 

 the base and unite with the basal rings in segments three, four, and 

 five; in older specimens, however, the lateral stripes are obscured by 

 more or less brown; dorsum of the eighth and ninth terga, with the ex- 

 ception of the black apical margin of nine, pale blue ; anal appendages 

 (Figs. 155, 156) black, the superiors small and black, the inferiors 

 black but with a paler dorsal spot. 



Female. — Color, pale blue (pale methyl-blue) or buff (ochraceous 

 buff), and black. 



Head as in the male but lighter in color, the front lacking the 

 vertical lines above the antennae and the transverse line below the me- 

 dian ocellus; postocular spots present and a pale transverse line, with 

 more or less yellow, on the caudo-dorsal margins of the head ; post- 

 genae with yellow adjacent to the compound eyes. 



