Sphegina. 369 



out central knob, but with the mouth edge very produced ; especially 

 the front mouth edge is protruding as a small knob, the lateral angles 

 somewhat retreating, but not descending; the epistoma is grey above 

 but pale on about the lower half; it is not haired. Jovvls small and 

 narrow, the oral margin a little descending. Oral cone somewhat 

 long. Clypeus horse-shoe-shaped. Proboscis longer than in Baccha; 

 labrum somewhat long, the apex characteristic ; it is deeply and broadly 

 cleft in the middle, so that the median process is quite divided and 

 each half forced towards the side in such a way that there is in 

 reality a cleft upper lateral process at each side; it is rather delicate; 

 the lower lateral process as usual broad and rounded at the end; 

 the usual row of small warts or papillæ present at the sides below. 

 Hypopharynx nearly as long as labrum, pointed at the apex ; maxillæ 

 knife-shaped, likewise not short, a little shorter than hypopharynx, 

 with microscopical hairs in rows; the palpas longer than the lacinia, 

 a little clubbed, microscopically haired and with some bristles. Labium 

 with the basal part a little longer than the somewhat broad labella, 

 it is yellow, not strongly chitinised. Thorax rectangular; scutellum 

 black, without hairs below the margin; there are no thoracai bristles, 

 but scutellum has a pair of fine apical bristles; metapleura very short- 

 haired. The hind coxæ are inserted on a downwards protruding part, 

 and there is a large metasternum behind and above them, lying 

 perpendicularly (or this part is more probably formed partly or quite 

 of the metathoracal pleura in accordance with the facts in Neoascia) ; 

 it is triangularly incised above and its upper corners are prolonged 

 as two points, stretching in under the balteres, these points are densely 

 short-haired. Abdomen is narrow, elongate and clavate ; the first seg- 

 ment is not quite small, broad at the base, somewhat tapering behind, 

 second segment is long and narrow, narrowest about the middle, a 

 little widened behind, third and fourth segments are shorter and 

 broader, the third broadest behind; in the female abdomen is similar 

 but second segment broader behind and third and fourth segments 

 broader, while the fifth is narrower and tapering, the abdomen thus 

 pointed. In the male there are four not transformed dorsal segments ; 

 on the ventral side the sternites are relatively small, so that there are 

 large, membranous parts; the first sternite lies in the excision of 

 metasternum and is small, the second sternite is narrow, but much 

 shorter than the tergite, it has a separate small chitinisation at its 

 front end ; third and fourth sternites are likewise considerabiy smaller 

 than the tergites, the fourth lying under the front half of the tergite, 

 The genitalia are large, forming a thick knob, the apical appendages 

 of the ninth segment long and with a styliform apex. In the female 



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