557 



Length of metathoracic wing-cases ... 3.5 mm. 



Length of median lobe 2 mm. 



Width of median lobe 5-1.3 mm. 



Adult; Male. — Color, pale blue and black. 



Head blue and black ; labium buff, the median lobe with a broad 

 median cleft; distal segment of the labial palpi pale; antennae brown, 

 the first segment sometimes with the cephalic half blue ; postclypeus 

 blue with a small black spot on each side ; anteclypeus blue ; labrum blue 

 with a black dorso-mesal spot ; exposed portion of the mandibles, their 

 trochantins, genae, and the front from the f ronto-clypeal suture dorsad 

 to the median ocellus, blue ; lateral ocelli with small J3lue spots ventrad 

 of them, and a similar spot between the ocelli ; remainder of the front 

 black; postocular spots very large, forming equilateral triangles and 

 occupying most of the dorsal portion of the occiput, the spots bounded 

 caudad by a very narrow black band and separated from the com- 

 pound eyes by a band of similar width; the narrow stripe caudad of 

 the ocellar area is indistinct ; occiput and postgenae pale blue. 



Thorax blue and black; pronotum blue and black, the cephalic 

 lobe with a transverse line of blue on the caudal margin, the median 

 lobes with elongate blue spots, contiguous on the meson, and semi- 

 crescentic spots of the same color ; proepimera and proepisterna brown 

 or pale ; mesothorax with the narrow black stripe covering the dorsal 

 carina but frequently divided there by a line of brown ; black stripe of 

 the mesopleural suture reduced to a line on the suture; mesinfraepi- 

 sterna with black crescentic marks on the dorsal borders ; remainder 

 of the pleura blue with the exception of small spots on the interpleural 

 folds and metapleural sutures adjacent to the wing bases; postcoxal 

 areas pale ; paraptera black, crescentic, the cephalic margins and lateral 

 angles blue; legs striped, pale blue or buff and black, the coxae and 

 trochanters blue, the femora blue with broad dorsal black stripes which 

 are frequently interrupted at the base by a pale spot ; tibiae pale blue and 

 buif with a short dorsal black stripe or none, the tarsi pale, black at the 

 tips ; claws deeply bifid and black at the tips ; wings with ten postnodal 

 cross-veins in the front wing and eight in the hind one; Mo arising 

 between the fourth and fifth postnodal cross-veins in the front wing 

 and between three and four in the hind one; stigma small, subelhp- 

 tical, and surmounting less than a single cell. 



Abdomen blue and metallic black, the dorsum of the first tergum 

 with a small black basal spot about half the length of the tergum ; sec- 

 ond tergum with a black, apical, shield-shaped spot, the spot extending 

 to the cephalic margin and narrowed at this point to a line on the me- 



