28 Orthorrhapha brachycera. 



bristles; all bristles black. Pleura dark grey. Abdomen somewhat 

 strong, dark grey, dull or very slightly shining, black haired, with 

 erect hairs which are not much longer at the sides than in the middle. 

 Venter similarly haired. Legs somewhat robust, black, and some- 

 what strongly pilose; the hind tibiæ slightly thickened towards the 

 tip and the two first joints of the hind tarsi slightly thickened. Femora 

 with dorsal and ventral rows of somewhat long hairs; tibiæ with 

 similar rows which are shortest on the ventral side; all tibiæ on the 

 dorsal side with somewhat strong bristles which are more numerous 

 than in the other species; the short, dense pubescence on front and 

 hind tibiæ present as usual. Tarsi with short hairs, a little longer 

 on the dorsal side of the hind tarsi. All hairs and bristles black. 

 Wings strongly brownish tinged, most towards the anterior margin, 

 the more saturated part bounded by the cubital vein. Veins black 

 or brown; the discai vein thin but distinct, the fork incomplete, the 

 upper branch being interrupted at the base. The apical part of the 

 mediastinal cell brown ; the wings iridescent. Balteres more or less 

 dark brown. 



Female. Abdomen blackish grey, somewhat æneous, shining; 

 the hairs as long as in the male. Wings and balteres as in the male. 



Length 3—3,7 mm. 



This species is recognised without difficulty by its somewhat 

 robust shape and legs and especially by its stronger pilosity, as also 

 by the dark grey abdomen in the male. 



B. pilosa is not common in Denmark; Tisvilde (the author); in 

 Jutland at Silkeborg (A. Petersen), at Sæby and Frederikshavn (H. 

 J. Hansen), and at Jerup north of Frederikshavn (Th. Mortensen). 

 According to the localities the species seems to prefer sandy piaces, 

 and nearly all the localities are at or near the shore. My dates are 



Geographical distribution: — The species is hitherto only known 

 from Denmark. 



Remarks: The above enumerated species of^^'ce^/arm are certainly 

 sure and distinct species; they are nearly related, the distinguishing 

 characters are small, but good and constant, It will perhaps not be 

 easy to determine the species from the analytical table given above, 

 but I think that it will always be possible, by use of the table and 

 descriptions , to get to a correct result. B. melaena is characterised 



