1909.] 61 



Ciliata, Zctt , and cecpialis, n. sp. Both are widely distributed 

 and very common, especially the first named. They form a large 

 part of the small insects that people our windows in spring and 

 autumn, and are at the same time frequently taken out of doors. 

 The colour of the halteres in ciJiata seems to depend largely on 

 locality. In the Scotch insect they are almost invariably black, whilst 

 in the Herefordshire one as invariably dusky yellow, the black form 

 being as rare in the one case as the dusky yellow in the other. The 

 characters which taken together distinguish them from their allies 

 are the narrow and sub-shining frons, the very large pleural bristle, 

 the conspicuous yellow^ fore coxse, and strong tibial cilia, whilst the 

 abbreviation of the 4th abdominal segment in the female of ciliafa is 

 quite an unique feature. Although the short costa of ceqioalis is 

 suggestive of Section D, it is so strikingly like ciliata that I have had 

 no hesitation in placing it in its present position. JEqualis must also 

 be very near Phora {Aphiochceta) minuta, Aldrich, but in the latter 

 the frons is broad, and the cilia on the hind tibiae are said to be short 

 and limited to seven in number on the apical half of the limb, whereas 

 in cequalis they are eleven in number, extending as usual from base to 

 apex, and are large, with the exception of the first three or four. 



Flavescens, n. sp. Of this fine and well marked species three 

 examples only have been taken— a male, 7/9/07, and female, 20/8/05, 

 at boggy runnels in Haughwood, and a female, 3/10/Oi, at a similar 

 sort of place in Coldborough Park. It resembles /awfl-, Fall., in many 

 ways, and if, as is probable, a yellow form should exist, that resem- 

 blance will be still closer, but the condition of the pleura, strongly 

 bristled in one and bare in the other, will amply distinguish them. 



Longisefn, n. sp. Not a common, nor yet a scarce species. 

 Frequents wet or boggy places from May to August. Widely dis- 

 tributed in Herefordshire ; Shobdon Marsh, Howie Hill, near Eoss, 

 and Mainswood being some of its localities. The exceptional length 

 of the arista is common to both sexes. Highly characteristic are the 

 genitalia of the male and its long depressed anal organ, carried just 

 as cattle carry their tails in repose. The attitude is very unusual, 

 generally the organ projects nearly horizontally, and in very short 

 examples may even have an upward tilt. 



Bivalis, u. sp. I took one ^ and two ? ? of this species by 

 sweeping over a piece of bare shingle on the river Mounow on July 

 31st, 1908. 



