Empididae. 221 



fine yellow hairs. Abdomen grey, with a broad, olive-brown, longi- 

 tudinal dorsal stripe; it is sparingly clothed with short, pale yellow 

 hairs, a little longer at the margin of the first dorsal segment. Venter 

 grey. Exterior genitalia chiefly resembling those in stagnalis. Legs 

 brown, tarsi darker towards the end; coxæ greyish pruinose, and 

 also the base of the front femora slightly greyish pruinose. The legs 

 with short, brown to blackish hairs, hind tibiæ with somewhat longer 

 hairs ventrally on the apical half; front femora with some black 

 bristles ventrally at the base, and besides with a row of exceedingly 

 short, nearly punctiform bristles. Wings hyaline, slightly greyish. Veins 



Fig. 91. Wing of Cl. Wesmaelii. 



dark brown or blackish, the radial vein somewhat undulated; the 

 medial cross-vein, the base of the cubital fork, the base of the upper 

 branch of the postical vein and the cross-veins closing the discai cell 

 apically, brownish seamed, the brownish colour at the end of the 

 discai cell stretching somewhat out along the upper branch of the 

 discai vein, and outwards to it a roundish spot on the branch; thus 

 the wing shows in all five brownish spots; anal vein long, but not 

 quite reaching the margin. No stigma. Halteres blackish brown. 



Female. With exception of the differences in the exterior genitalia 

 quite similar to the male. 



Length about 4 mm. 



Cl. Wesmaelii seems to be rare in Denmark, only one specimen, 

 a female, has been taken on '^-'Ic, 1874 on a window in Rugballegaard 

 near Vejle (Schlick). 



Geographical distribution : — Europe down into Italy ; towards 

 the north to middle Sweden. 



III. Subg. Eucelidia Mik. 



Stigma present, elongated; discai cell long, pointed towards the 

 apex; anal vein not reaching beyond the anal cell; costa with some- 

 what strong spines. Glypeus horse-shoe-shaped, separated from the 

 epistoma; jowls somewhat descending below the eyes and hence not 

 separated from the cheeks. Acrostichal bristles present; no small 



