me.] 233 



(Ins. Brit. Dipt., ii, 166) is really Elgiva rufa, whicli is common in 

 England, but true E. cuGullaria, L., also occurs though more rarely ; 

 I possess it from Plashet Park near Lewes and from Woking. 



84. Psila viUosuJa, Mg. : on my study window on September 9th, 

 1884 ; probably common, but overlooked. 



85. Psilosoma Lefehvrii, Ztt. : I have an old specimen which I do 

 not know the history of, but which I have no doubt is British. 



86. Themira spinosa, n. sp. 



!N'ear T. minor, Hal., and like that, small, entirely black-legged, and having the 

 black costa extending to end of fourth vein ; the front legs are however very 

 different from any figure given by Van der Wulp in Tijda. Ent., vii, Tab. 8, and the 

 end of the male abdomen bears pencils of bristles very like his T. curvipes, I. c, 

 Tab. 8, f. 11 ; the front (^) tibiae have a strong tubercle in front about the middle, 

 on the lower edge of which is a good sized bristle, while just above the tubercle is 

 another double bristle ; the femora are extremely compressed about the middle and 

 swollen after, on this swollen part above are about four strongish bristly hairs, and 

 beneath about the middle is a strong bifid or double tooth, between which the tibial 

 tubercle would lie when the legs are folded, near the base is a long thin bristle ; the 

 basal joint of the front tarsi is thin, except at end, and as long as the next three 

 joints, the second and third being about equal ; the hind tibiae are very strongly 

 twisted about the middle, almost as if broken, and are finely ciliated inside above 

 the twist. The pleurae are greyish above the middle coxae. Of the European spe- 

 cies with fasciculated male genitalia (Cheligaster, 'Mcq.), T. Leaehii, Mg., curvipes, 

 V. d. Wulp, and {Enicita) annulipes, Mcq., have the legs more or less reddish- 

 yellow ; of the black-legged species T. putris, L., is much larger than the others, 

 leaving T. superba, Hal., ciliata, Staeg., and pusilla, Zett., to be distinguished from 

 T. spinosa. I omit Desvoidy's two species (on which the genus was founded) as 1 

 think his T. pilosa is most likely only T. putris, L., rather than T. superba, Hal., as 

 given by Walker (Ins. Brit. Dipt., ii, 212), and his T. phantasma may well be T. 

 Leaehii, Mg. ; of the three left I possess a male of T. superba, Hal., and in that the 

 hind tibiae are comparatively simple, and the front legs much as Haliday describes 

 them, which is quite distinct from, though allied to, T. spinosa ; T. ciliata, Staeg, 

 besides having presumably simple hind tibiae, has " pleuris immaculatis — femoribus 

 intermediis subtus apice, posticis latere interiori ciliatis ;" T. pusilla, Ztt., is very 

 insufficiently described, but probably has simple hind tibiae and "femora antica 

 subtus — denticulo — et setulis aliquot brevibus nigris." 



I caught several specimens of this on the islands on Loch Maree, 



on June 9th, 1884, and one male at Tongue on June 18th, 1884. T. 



minor, Hal., occurred in company with it on Loch Maree, or at any 



rate was taken on the same day. 



87. Ptilonota centralis, E. : one female at Darenth, May 5th, 1867. 



88. Fterojpcsctria palustris, Mg. : several specimens caught on 

 August 3rd, 1884, at Seaford answer well to this species, also some 

 caught at Plashet Park near Lewes on August 4th, 1872, and one at 

 Abbots Wood, Sussex, on July 12th, 1869. I am not at all satisfied 

 with the distinctness of this species from P. oscillans, Mg. 



