O [January, 



the head, leaving practically no jowls ; antennse placed below the middle of the 

 head. Face and frons of almost equal width and less than one-third the width of 

 the head, face without the conspicuous keel of many Drosopldlince. Face, frons 

 and first two joints of the antennse whitish, slightly tinged with yellow, third an- 

 tennal joint and proboscis a rich dull yellow, clypeus and palpi blackish. Three 

 pairs of fronto-orbital bristles, the two upper pairs pointing backwards, the lower 

 pair forwards ; two pairs of vertical bristles, inner pair pointing backwards and 

 parallel, outer pair pointing backwards and outwards ; postvertical pair small, 

 decussate, immediately behind the ocellar triangle ; one pair of small vibrissa) ; 

 ocellar bristles absent. 



Thorax shining black, with a clothing of short black hairs entirely confined to 

 the black part of the disc ; a patch extending from the humerus to the root of the 

 wing and including the presutural bristle is of the colour of the frons, while the 

 postalar callus and the large broad seutellum are a bright citron-yellow ; pleurae 

 rather paler coloured than the seutellum ; while the sternopleura, a round spot on 

 pteropleura in front of, and a larger spot just below, the hypopleural spiracle, are 

 black. There are one humeral, two posthumeral, one presutural, one supra-alar, 

 one postalar, and four prescutellar bristles, which latter apparently represent the 

 last of the inner and outer rows of dorsal bristles ; there is also a second small 

 bristle on the postalar callus near the basal corner of the seutellum, while there are 

 four scutellar and two nearly equally strong sternopleural bristles. 



Abdomen of the male as figured, but in the female the dark markings are not 

 so extended, as the second segment has only a small dark spot in the middle, and 

 one at each extreme side, while the third segment has only a central dark spot with 

 faint indications of the rest of the band ; and the dark markings on the fourth and 

 fifth segments are not so extensive. 



Legs of the same colour as the frons, and without pre-apical or any other 

 bristles ; the first joint of every tarsus rather longer than the other four joints 

 together. 



Wings as figured, quite clear. Mediastinal vein rudimentary, no nervure se- 

 parating the second basal from the discal cell, anal cell small but obviously present. 

 Halteres pale yellowish. 



Frauenfeld bred this species from larva? found among Aleurodes 

 pliillyrece, Hal., on Cratcecjus ; while he also caught it on evergreen 

 Viburnum trees infested with Aleurodes Jelineki, v. Frf. Mr. F. 

 Jenkinson has recorded on p. 300 of this Magazine for last year his 

 capture of this species at Cambringe. 



Synonymical Note. 

 Meigen, in 1830, described an Ac/romyza omata, his short de- 

 scription answering very well to our insect, and if he overlooked the 

 presence of the small nervure separating the second basal from the 

 discal cell, it might well be our species ; but Prof. Brauer, has in- 

 formed me that Schiner recognised Meigen's Agromyza omata, there 

 being a specimen so named by him in the Coll. Musei Vindobon., and 

 that specimen is not Acleioxenus syrphoides. 



