558 



son ; terga 3-7, inclusive, with longitudinal black stripes widened subap- 

 ically and narrowed basally, the lateral margins of the terga pale ; terga 

 eight and nine usually entirely blue, the eighth sometimes with a basal 

 spot on the dorsum; tenth tergum black; anal appendages (Figs. 199, 

 206) short and black, the superiors slightly longer than the inferiors 

 and appearing slightly knobbed at the apices when seen in lateral pro- 

 file; viewed from above, the superior appendages are seen to have 

 broad basal lobes which are often contiguous on the meson ; inferior 

 appendages short, subconical, and directed obliquely dorsad ; first 

 sternum pale, 3-8 black, the tenth pale. 



Female. — Color similar to that of the male. 



Head similar to that of the male except that the front is paler 

 and the spots ventrad of the lateral ocelli are larger and connect with 

 the pale color of the ventral portions of the front ; the black borders 

 of the postocular spots are narrower than those of the male. 



Thorax : dorsal stripe divided by a line of brown on the carina ; 

 mesostigmal plates pale blue, the lateral angles elevated (Fig. 214), 

 and a sinuate dark stripe on the supraepisterna just caudad of the 

 plates; mesopleural suture with a distinct spot cephalad of the wing 

 bases and the black of the infraepisterna reduced to narrow dorsal 

 lines ; postnodal cross-veins of the front wing ten to eleven, of the 

 hind wing nine to ten. 



Abdomen : dorsum of the first tergum with a black basal spot, 

 2-7, inclusive, with narrow dorsal longitudinal stripes, widened sud- 

 denly near the caudal margins and narrowed to the meson near the 

 cephalic margins ; tergum eight blue with a narrow dorsal stripe ex- 

 tending a little over half the length of the tergum from the base, 

 (Fig. 94) ; ninth and tenth terga blue; anal appendages of the usual 

 form ; ovipositor with broad, blue, lateral valves ; first and second 

 sterna pale, with black mesal lines, 3-8, inclusive, black. 



Measurements 



Length, $ 31 mm. 



Length, 5 31 mm. 



Length of abdomen, $ 25 mm. 



Length of abdomen, $ 25 mm. 



Length of hind wings, $ 17 mm. 



Length of hind wings, $ 18.5 mm. 



Width of hind wings, $ 3.25 mm. 



Width of hind wings, 5 3.5 mm. 



