AiscJina. 185 



Male Imago. 



Face. Labrum dark brown, especialh- at margin ; 

 labium yellow, margins brown ; rhinarium blackish ; 

 frons and nasus dull yellow, separated by a thin black 

 line, on the upper surface of vertex a crescentic black 

 mark, joined b}' a neck to the black line in front of 

 the black \'ertex. Ryes blue, in contact but a short 

 distance. Tliorax down\', brown, two small blue marks 

 in front, and two irregular blue lines at sides ; sutures 

 between the \arious parts black ; projections at the 

 attachments of the wings and between them chiefl\' 

 blue. Wings hyaline, costal nerxure }'ellowish-brown, 

 •others black ; meshwork of cells fine ; anal angle of 

 hind-wings pointed ; anal triangle enclosed b\- strong 

 nervures, and divided into two cells. Ptcrostigiiia nearly 

 black, 4mm. long. Accessory iiiciiibi-auc triangular, 

 cinereous.. Legs black. Abdouicu swollen at second 

 segment, much contracted at third, about the same width 

 from fourth to end ; the aiu'icles on the second segment 

 have three teeth below ; basal segments down}- ; colour 

 of abdomen dark brown, incons[)icuous on account of 

 the great development of the blue spots ; first and 

 second segments almost entirel}' blue ; from 3 to 7 

 with six spots, three on each side of the mid- 

 dorsal line, the middle pair being sometimes dixided ; 

 8 and 9 have four, and 10 two. Upper anal 

 appendages short, black, blinit, \\ith a line of hairs 

 internall}- ; near the apex of the median carina fi\e or 

 six teeth ; and a tubercle near the base below ; lower 

 one half the length of upper, triangular, cut square 

 at apex. 



