BRITISH SPECIES OF DIPTEROUS GENUS FANNIA 175 



THE BRITISH SPECIES OF THE DIPTEROUS 

 GENUS FANNIA, Rob. Dsv. 



By J. R. Malloch. 



(Continued from page 162.) 



8. canicularis, L., <J . The common small house-fly which occurs 



throughout the year. Very variable in colour, sometimes the 

 thorax is nearly unicolorous grey, while often there are only 

 signs of the centre stripe of the three that are generally 

 present; the abdomen has generally the sides of the second and 

 third segments translucent yellow, this even when it is not 

 noticeable from a direct examination from above is always 

 evident when held up to the light; legs with the knees, 

 especially the fore pair, distinctly yellow, fore pair with the 

 usual bristles ; mid femora with a row of widely placed, not 

 very strong bristles on the basal half, about five in number, 

 and a row of about twelve very short closely-placed bristles- on 

 the apical half of the antero-ventral surface; postero-ventral 

 surface with a row of about ten long bristles on the basal two- 

 thirds and about six small bristles on the apical third ; mid 

 tibia with the usual bristles, hardly or not at all dilated on 

 apical half; ventral surface with remarkably close, short, 

 pubescence ; hind femora with a row of rather short bristles, 

 increasing in length at the tip, on the antero-ventral surface; 

 postero-ventral row reaching only to about the middle; hind 

 tibia with the usual dorsal bristles, a row of rather uneven 

 small bristles, besides the usual strong one, on the antero- 

 dorsal surface and two antero-ventral bristles ; calyptra whitish, 

 unequal ; halteres yellow ; wings greyish, fourth and fifth veins 

 convergent ; outer cross-vein bent, last portion of fourth vein 

 twice the penultimate. 

 9 . Diners from the o* in the absence of the yellow colour on 

 the abdomen in all the specimens I have seen ; the thorax is 

 generally three-striped; the legs are distinctly yellow on the 

 knees, and, with the exception of the femoral bristling and the 

 pubescence on the mid tibia, are similar to those of the 3 . 



5 to 7 mm. 

 Abundant everywhere. 



9. difficilis, Stein, <£ . Very similar to canicularis, but much 



darker in colour, the thorax being quite black, the abdomen 



