^40 [November, 



but broa<1ly three-striped v/ith brownish-black, the narrow central 

 stripe broadening out for some distance immediately behind suture 

 so as to coalesce with the broad side-stripes, these latter being 

 connected at the side with a dark patch above each wing-base. 

 Abdomen grey with almost equally large broadly triangular dark 

 patches on second and third segments. First segment darkened 

 about the base but greyish about the middle and broadly at sides 

 beliind ; fourth segment brownish on a central stripe and towards 

 beliind; the partly concealed 5th segment also brownish. Middle 

 i'emora with finer bristles beneath about base than in allied species ; 

 middle tibiae usually with only one bristle behind. Wings with a 

 few tiny bristles on cubital vein for not more than one-third of the 

 distance from base to discal cross-vein (in allied British species 

 these bristles are confined to the nodose junction of radial and 

 cubital veins). Squamae whitish, Halteres yellow. 



$. DilFering from the male in having usually much narrower 

 thoracic stripes. The middle stripe rarely coalescing with the side- 

 stripes and these latter shorter and usually much narrower. Scutel- 

 lum grey with a brown patch at each basal corner. Abdomen with 

 large brown, slightly shining patches on second and tliird segments, 

 extending broadly along the hind margin towards sides ; first 

 segment at most with a pair of only very small faint brownish 

 patches opposite the basal end of each patch on second segment; 

 fourth segment often with a brownish median line. Middle femora 

 with shorter finer bristly hairs about base beneath ; hind femora 

 with only 2-3 auteroventral bristles towards tip and shojt-haired 

 post er ov en tral ly . 

 Length 4-5 mm. 



Tliis appears to be a more southern species, which I found at 

 Swanage (Dorset) in August 1906 ; Col. Yerbury at Torcross 

 (l)(!Von), Llaugammarch (Brecknock), Port Wrinkle (Devon), and 

 L?lant (Cornwall) in August and September ; Dr. J. H. Wood at 

 Olchon Tarn (Hereford) in September; Mr. H. W. Andrews at 

 Milford Haven (Pembroke) and in Ireland in June, July, and 

 August; and Mr. C. G. J^amb at Padstow (Cornwall) in July. 

 Mr. A. E. J. Carter, however, has taken the species as far north as 

 Aberfoyle (Perth) in September, 

 8 (7) Thorax entirely brownish-black behind and only indistinctly striped in 

 front. Hind femora with stouter auteroventral bristles and no long 



posteroventral hairs *27. vniseta Stein. 



cT . Frons at narrowest part rather wider than 3rd antennal joint ; 

 orbits narrower than frontrilia. Thorax much darker than in any of 

 the allied species, being grey only on front margin, humeri, and 

 notopleural depression, though the dark part in front of suture may 

 be more or less distinctly split up into stripes. Abdomen with first 

 segment extensively darkened : second and third segments Avith 

 large broad subquadrate dark patches; and fourth segment v,ith 

 indications of a dark central stripe and hind margin; the visible 

 part of fifth segment also brownish. Legs with strong bristles 

 beneath base of middle femora ; middle tibiae usuallv with two 



