0'79 [Decemhcr, 



5 (4) Frons sparingly dusted on upper half . A ouleus very long and slightly 



recurved. Ungues very long 5. f/eniculattis Mg. 



6 (3) Fron.s brightly shining to a greater or less extent in front of ocellar 



triiingle. 



7 (8) Ungues .-md pulvilli short as iu the male 0. nif/ritulvs Zett. 



8 (7) Ungues and pulvilli much longer than in tlie male. 



!) (10) Humeri dark 7. flavitarsis, sp. n. 



10 (9) Humeri yellow. 



11 (ll'j Aculeus shorter than the basal part of liypoi)ygium. Hind tibiae more 



conspicuousl}' bent 3. cilitarsis Strolil. 



1:^ (11) Aculeus longer than basal part. Hind tibiae straighter 



... .4. sy I vat tens Mg. 



In addition to the above, I possess a single female specimen captured 

 bv uij'self at Glcnmore (Inverness) on June 5th, 1913, which appears to 

 represent a distinct species. The fn)ns is sliining above, abdominal 

 pul)escence bhick, liumeri yellow. Aculeus very long, reaching to end of 

 lirst abdominal sternite, anterior femora and bind trochanters armed with 

 tiny black spines beneath at the base ; tarsi yellow, with the last joint 

 black. It most resembles si/lvafioiH. but has a distinct!}' longer acideus. 



1. P. littoralis Becker is an easily distinguished species, sufficient!}' 

 differentiated in Verrall's " Britislt Flies." The hind trochanters, liow- 

 ever, are armed witli distinct, tliough small, dark bristles at t!ie base 

 beneatli and not at the "end " as stated by Verrall, and tliese bristles are 

 quite different from any tin}' liairs -whicli may be present on tire anterior 

 troclianters, though similar tiny bristles are present beneatli the base of 

 anterior femora in tlie female only. 



Verrall (" British Flies," viii, 124) mentions a male from Bigot's 

 Collection labelled " Alloneura jlarijies,^' and a female from Kowarz's 

 Collection separated oft" from sylvaticvs, as belonging to littoralis Becli. 

 This is incorrect: in tliese examples the abdominal pubescence is not so 

 pale, tlie liind troclianters are unarmed, and tlie female lias an entirely 

 dusted irons, and an aculeus which is somewliat curved upwards as in 

 vicinns Beclv. or mutafiis Beck. ; in fact, both specimens must be near to 

 iHcinus, but tlie abdominal pubescence does not appear to be sufficiently 

 conspicuous, and tlie triangular shape of tlie male hind trochanters is not 

 marked. 



2. P. minimus Becker. Berl. Ent. Zeitschr. xlii, 85 (1897), $ . 



cT . Head much as in littoralis, the eyes touching for only a short space and 

 the frons brilliantly silvery. Antennae darker, not so translucently yellowish 

 towards tip. Disc of thorax not so dusted greyish, only the part in front of 

 suture appearing distinctly greyish when viewed from in front. Abdomen less 

 dusted, though inconspicuous greyish patches can be traced at the sides of seg- 

 ments ; the tiny bristles darker (almost black). Hypopygium more projecting 

 and with a more distinct diagonal suture above, widening out into a membranous 



