5'8 SYHPHIDJE. 



joint being a little yellowish below near the base, with a long, 

 slv - jy plumose arista; proboscis shining black, with yellowish 

 labella. Thorax quadrate, punctate, black, with indistinct purplish 

 reflexions ; humeri yellow, there is also another smaller yellow 

 spot on the inner side of each humeral callus ; sides of the suture 

 with an abbreviated yellow band ; the postalar calli and a band 

 just before the scutellum also yellow ; pleurae shining black, 

 the propleurse and a vertical band across the mesopleura? yellow ; 

 this band is clothed with long yellowish hair and is attenuated 

 below and dilated above, where it is in contact with the sutural 

 band. The dorsuin of the thorax is clothed with dark and yellow 

 hair, which latter forms a median longitudinal band, which is bifid 

 in front, a broadly interrupted sutural band, and a complete one 

 before the scutellum ; there are also some very long black bristles, 

 a group of shorter ones in front, and four very long ones behind 

 them, and besides a row of short bristles before the scutellum, the 

 external ones being longer and decussate. Scutellum black at the 

 bise, yellow below and on the sides ; the entire middle is occupied 

 by a very broad and deep depression, which is black and grey- 

 dusted in the centre ; the scutellum bears golden-yellow hairs on 

 the sides and along the hind border, and four very long black 

 bristles, the middle ones decussate. Metanotum shining black ; 

 squamuLe whitish, with a yellowish fringe ; halteres white. 

 Abdomen oval, blunt at the end, convex, very strongly punctate ; 

 first segment } T ellow, with a smooth and glittering median depression 

 below the scutellum, the sides produced anteriorly, forming two 

 very prominent tubercles; the succeeding segments are yellow, 

 punctate throughout, with only a linear shining band on the front 

 border of the second segment, before which the border is granulated, 

 and a narrow band on the hind margin of same segment ; the hairs 

 are whitish and erect on the sides, golden yellowish and depressed 

 in the middle, becoming longer on the fourth segment ; there are 

 two lateral black stripes, one on each side, running from the fore 

 border of the second to the hind border of the fourth segment ; in 

 the middle of the second, third, and fourth segments there are two 

 brownish indistinct divergent spots, forming the usual triangle. 

 The venter is greatly sunken, surrounded by a raised margin, 

 shining yellow, black at the end. Legs, including the coxse, entirely 

 yellow, the hind pair strong and thickened, with short but dense 

 yellow hairs ; tarsi darkened at end ; hind femora with the apical 

 half a little reddish ; hind tibiae without stout black bristles 

 externally ; basal joint of middle tarsi long and thin, as long as the 

 other joints together. Wings with a yellowish-grey tinge and the 

 usual venation, with no trace of a vena spuria ; the stumps of 

 veins at the lower angles of the first posterior and discal cells very 

 long, longer than in the preceding species ; stigma brown ; sub- 

 costal cell yellow, brown at the end ; the first oblique brown band 

 begins at the stigma and ends at the fourth vein near the small 

 cross-vein ; the second broader band begins at the end of the first 

 vein and ends broadly in the first posterior cell, where it fuses 



