44 Orthorrhapha brachycera. 



rostris and similarly haired, but both the common, short pubescence 

 and the other hairs and bristles are longer and more conspicuous; 

 the hairs on the dorsal side of the hind feniora are yeilow, and at 

 the tip of the hind tibiæ among the blacic bristles there are yeilow 

 hairs, placed densely, almost tuft-Uke, which are totally absent in 

 spissirostris. Wings as in spissir ostris; balteres a little more yellowish. 



Fig. 9. Wing ot Eh. dissimilis 9. 



Female. Ditfering from the male in the same way as the female 

 of spissirostris, but the wings have the discai cell normal though 

 longer than in the male ; outwards to and below it (in the third and 

 fifth posterior cell) there are two faint, greyish or yellowish, oblong 

 spots. The balteres are whiter. 



Length 5 — 6,5 mm. 



Zetterstedt mentions a variety with not maculated wings, and 

 another variety with patches on the wings; of this latter he had only 

 seen one specimen from Denmark, and he adds „E Smolandia quoque 

 missu", but the whole passage seems to show, that he had also only 

 one female of the variety with not maculated wings. I think the patches 

 may have disappeared by exsiccation; all specimens I have seen had 

 them distinctly observable. 



Bh. dissimilis is more common in Denmark than spissirostris, 

 that is to say, it is generally present in greater numbers, but it has 

 only been taken on few localities; it occurs exclusively near water; 

 Amager Fælled, Charlottenlund, at Hornbæk and on Langeland at 

 Lohals. It is a spring species as the preceding, my dates are ^'Vs — •^*^/6. 

 I took it on Amager Fælled flying low over a water pool in great 

 numbers together with spissirostris, but this latter species was only 

 present in single specimens; sometimes it was seen to swoop down 

 on small particles flowing on the surface of the water, as in search 

 for prey, but I never succeeded in taking it with prey. 



Geographical distribution : — The species is hitherto only known 

 from the southern Sweden, Denmark and England. With us it is, as 

 said, more common than sjnssirostris, but in Sweden the reverse 

 seems to be the case. 



