172 • fAugiist, 



in frout of two (or even tliree) very narrow darker stri])es between 

 the rows of dorsocentral bristles. Sternopleiiral bristles 1:1. 

 Abdomen somewhat similar in colour to thorax and with only faint 

 indications of brownish patches on second and third segments, much 

 smaller than in male; ovipositor without distinct hairy terminal 

 lamellae. Chaetotaxy of legs as in male, but middle femora much 

 shorter-haired below. Wings clearer. Squamae paler. Halteres 

 yellow. 



Length about o mm. 



This species is not uncommon round the British coast. Mr. 

 Verrall found it at Aberlady (Haddington) in June and July, and 

 at Fawley (Hants) in June. Col. Yerbury's captures were at 

 Aldeburgh (Suffolk) in September, Walton-on-Naze (Essex) in 

 July and August, Dartford and Gravesend (Kent) in June and July, 

 Studlaud (Dorset) in September, and Pyle (Glamorgan) in August. 

 Col. C. G. Nurse found it fairly commonly at Walton-on Naze in 

 September and October, 1919, and Mr. fl. W. Andrews has taken it 

 in the Thames marshes (Kent) and at Milford Haven (Pembroke). 



L. depressiusctila, which somewhat resembles this species, has in 

 the male distinct posteroventral bristles to hind femora, and in the 

 female 2-.3 distinct fine hairs in the same situation, two bristles in 

 front of middle tibiae, and three anteroventral and three anterodorsal 

 bristles to hind tibiae. The ovipositor also has distinct hairy ter- 

 minal lamellae. 

 32 (31) Abdomen, viewed from behind, with patches on second segment 

 practically confluent *1.3. cierea Fin. 



cf. Very much like the previous species but always smaller. 

 Eyes only microscopically pubescent. Frons rather narrower, the 

 frontalia at narrowest part very little wider than the orbits. Abdo- 

 men darker, the greyish part more brownisli-grey, the dark patches 

 wider and less sharply differentiated ; no dividing stripe between the 

 patches on second segment when viewed from behind, though a very 

 narrow glistening line may be traced in some lights. Chaetotaxy 

 of legs very similar, but the bristles of row beneath middle femora 

 are stronger, and the other hairs near by shorter. The infuscation ot 

 wings and squamae varies according to the maturity of the specimen. 

 Halteres though sometimes deep yellow, appax-ently never dusky. 



$ . Easily distinguished from any other British species by the 

 broad, brightly shining interfrontalia. Thorax brownish-grey, 

 without stripes. A.bdomiual patches practically indistinguishable. 



Length 4-4^ mm. 



This species is undoubtedly distinct from marina though it 

 frequents similar situations. Mr. Verrall found it fairly common in 

 the Isle of Arran in June and at Aberlady (Haddington) in June and 

 July, It has also occurred in the valley of the River Deben and at 

 Butley (Suffolk) in June, and Col. Yerbury has taken it at Barmoutli 

 and Llanbedr (Merioneth) and Studland (Dorset) in June and July, 

 and Mr. Tl. W. .\ndrews at Milford Haven (Pembroke) in July and 

 at Kenmare (Co. Kerry) in Ireland. 



