344 Syrphidae. 



bi'oad, the uppér chagreened with long, somewhat tufted, yellow hairs. 

 Legs in typical scripta all yellow, sometimes with the tarsi more or 

 less browned; the hairs on femora almost all black, or yellow on the 

 anterior side of front femora and at the base of middle femora; below 

 the hind femora the hairs are crowded in the apical part on both 

 sides of the bare channel, and on the posterior side they are very 

 dense and short and stubby, while a basal space on the postero- 

 ventral side is almost bare; the quantity of the short, stubby bristles 

 varies much; the hind coxæ have long, yellow hairs, more or less 

 intermingled with black ones; the hairs on front tibiæ are yellow, 

 sometimes with a couple of black, on posterior tibiæ mainly black, 

 though the middle tibiæ may have many yellow hairs. Wings hyaline 

 or a little yellowish tinged. Squamulæ and balteres yellow. 



Besides the variations mentioned the species may vary still more; 

 the described form is the true scripta, which is the most comnion in 

 Denmark; it is the palest form; the next variety is similar but has 

 the anterior coxæ black, the hind coxæ partly so, and the trochanters 

 more or less darkened (var. dispar Loew). Then comes a still darker 

 form with all coxæ and trochanters black, the jowls blackish grey, 

 the abdominal bands very much sloping and first and third abdominal 

 bands emarginate or interrupted, and often only a yellow V on fifth 

 segment; the genital appendages are more or less black (var. nigri- 

 coxa Zett.). The darkest variety has likewise coxæ and trochanters, 

 and also sometimes base of femora, black and the jowls black; the 

 abdominal bands are generally interrupted and do not reach the yel- 

 low side margin ; the fifth segment with only a yellow V ; the genital 

 appendages more or less black (var. strigata Stæg.). 



Female. Vertex broad, black and shining; frons yellow, shining, 

 from the vertex a broad, black middle stripe stretches down to, or 

 almost to the antennæ; the hairs black on the upper half, paler down- 

 wards. Thorax with the three duU stripes more obvious than in the 

 male. Scutellum generally with more or fewer black hairs. Abdomen 

 shorter; it has the side margin and four, somewhat narrow and 

 arched bands yellow; the bands may vary somewhat, the first, or the 

 first and third, or the three first may be narrowly interrupted; they 

 are somewhat shelved off at the sides but reach the yellow margin; 

 the fourth band is always interrupted, and the spots produced for- 

 wards and backwards at their inner end and thus somewhat hammer- 

 shaped; the sixth segment is orange with three, often more or less 

 connected black spots; seventh and eighth segments blackish or ob- 

 scurely orange, with paler margins. The hairs mainly black except 

 the long hairs on the sides at the base and some way down the 



