219 



subcordatc at base, very strongly tlcprcsscd, the vibrissa! plates situated 

 about half way lietwecn the middle and the base ; ovipositor very sliort, 

 not protruded, and enclosed by the fifth ventrite which reaches to the 

 apex but is not at all compressed. 



Legs of usual length and without special modifications ; the middle 

 tibiae moderately enlarged at apex, the sptir as long as the first tarsal 

 joint ; the middle tarsi thicker than the other tarsi. Wings with the cos- 

 tal cell wide ; the di.scal ciliation moderately dense, sparser on the basal 

 part before the narrow speculum : marginal fringe very sliort and thick ; 

 marginal vein nearly punctiform or slightly longer than thick; stigmal 

 moderately long or about equal to the marginal and postmarginal veins 

 combined, somewhat enlarged at apex with a spur on the upper side, 

 postmarginal about two-thirds as long as the stigmal : liind wings with 

 the costal cell nearh' absent. 



Head and thorax very finely reticulate, the abdomen slightly more 

 coarsely reticulate, all parts, especially head and notum, strongly shining; 

 frontovertex witlr a few scattered, minute and shallow pin-punctures, the 

 mesonotum witli minute, seriated, setiferous punctures. Eyes with a fine, 

 rather tliick pubescence ; rest of head with longer, moderately thick pu- 

 l)escence ; mesoscutum and scutellum with numerous seriated, bristle-like 

 hairs ; abdomen finely, sericeously pubescent especially on the sides and 

 apical margin ; the pubescence blackish throughout and not conspicuous. 

 Coloration metallic bluish and greenish black. 



Male : Similar to the female except in the very peculiar and higldy 

 specialized liead. This is a little longer than wide and ^ubcircular in 

 frontal view, very thin towards the mouth fronto-occipitally and grad- 

 ually tliickening above where it becomes about three times as thick as 

 at the oral margin, the dorsal surface very strongly convex ; fronto- 

 vertex nearly as wide as long, w-ith the frons very prominent and pro- 

 tuberantly produced forward beyond the eyes ; the ocelli arranged in a 

 large, equilateral triangle, the anterior one on a line with the anterior 

 dorsal corners of the eyes, the posterior pair close to the eye-margins 

 and remote from the rounded occipital margin ; eyes subtriangular with 

 the posterior orl)its rounded: clieeks as long as the eyes; face strongly 

 produced upward lH'_\ond the eyes and joining the frons in an acute 

 angle, strongly ol)liquely reflexed and concave from the frontal angle to 

 the antennal sockets as seen in side view, tlie upper part lietween and 

 beyond the eyes flat from side to side, the remaining part above the 

 antennae concave from side to side, the part below the antennae moder- 

 ately convex. 



.Antennae inserted very far apart on the outer margins of the face 

 next to the cheeks, and half way between the base of the mandibles and 

 the eyes; short and strongly clav.ate ; scape very short and incrassatc, 

 but little longer than tliick, reacliing not more than one-thiid of tiie dis- 

 tance to upi)er margin of face, in cross-section subtriangular, tlie lower 

 side slightly hollowed to receive the pedicel, the other two sides convex, 

 the outer margin in outline straight, the inner margin forming an arc 



