192C. ] 275 



2- Upper two-thirds of frons and upper part of occiput sliining black. 

 Tliorax and abdomen also rather more shining than iu gemculattis, Ilypopygium 

 Avith a shorter, quite straight aculeus reacliing only to the end of 2nd abdominal 

 sternite, whereas in iieiiiculutus it is longer and slightly recurved. Legs with 

 rather more slender femora, the anterior pairs unarmed at the base beneath ; 

 ungues and pulvilli short as iu the male. 



Length fully 3 mm., (5 ; slightly smaller, J . 



I have examined the types in Zetterstedt's Collection at Lund, and 

 they are undoubtedly the same as our British species, while Kowarz, and 

 probably Becker, had correctly recognised the s])ecies. Verrall, subsequent 

 to the publication of his vol. viii of " British Flies," had separated the 

 females from geniculatus under the MS. name oi gampsonyx, but failed 

 to distinguish the males. 



P. nijritulus cannot be called rare in Britain. Verrall had taken, 

 but not distinguished from geniculatus, two males — one at Landport, near 

 Lewes (Sussex), on July 4th, ISGS, the other at Wimbledon (Surrey) on 

 September 3rd, 1871 — and a female at Landport on June 6th, 1870. 

 Col. Yerbury caught a female at Walton-on-Naze (Essex) on August 8th, 

 1907, and two females at Beachy Head (Sussex) on July 29th and 31st, 

 1914. Mr. F. Jenkinson has taken it at Crowborough (Sussex) in Sep- 

 tember, and in some numbers at Carrow, near Norwich (Norfolk), on 

 June 6th and 7th, 1903. Mr. H. Scott found a female at Henley-on- 

 Thames on Jul}' 17th, 1911, and Mr. C. Gr. Lamb has taken it at Wells 

 (Somerset). 



7. F.jiavitarsis, sp. n. d" $ • 



Resembling sylvaticus, but humeri darkened and hind trochanters unarmed. 



(S . Third antennal joint not so rostrate as in sylvnticus, and with a ten- 

 dency to be yellowish. Thorax slightly more shining and with dark humeri. 

 Abdominal bristles less distinct (rather shorter and brownish-black) on last 

 segment. Hypopygium with no groove above, but with a terminal wide 

 depression, l^egs with the first four joints of tarsi pale yellowish, hind tro- 

 chanters unarmed, hind femora with a rather distinct postero-veutral ciliatimi 

 of pale hairs, more distinct than in sylvaticus, but less so than in (/enicu/dtii.". 

 Kadial vein more distinctly upcurved to costa, and fourth costal segment con- 

 sequently shorter. 



2 . Agreeing with the male. Frous snining for a short distance at vertex 

 and very concave just beyond the shining part. Bristles on first abdominal 

 segment yellowish. Anterior femora armed at base beneath with tiny yellowish 

 bristles. Aculeus as in sylvaticus, but not quite so long. 



Length about 2'5 mm. 



Described from a [)air taken at Chippenham Fen (Caiubs), the male 

 on Sept. 13th, 1897, the female on Sept. 10th, 1897, while I also possess 



