PoKPHYROPS is evidently allied to Rhaphium and Medeterus 

 (pi. 162.)> the masculine antennae of the former very much 

 resembling those of section B, and the tarsi in the same divi- 

 sion being frequently irregular in their structure as they ge- 

 nerally are in the male Medeteri. Mr. Haliday has given a 

 list of the species found near Belfast, in the 5th Vol. of the 

 Zool. Journal, and described some new ones. It is only 5 or 

 6 years since the Guide was published, yet I am now able 

 nearly to treble the number of native species. 



A. Seta of antennae inserted before the apex of the 3rd joint. 



1. diajohanus Fab. — semiargentata T>oyi. 4. \'^1. f. 2 and 3. 



From the end of May to the beginning of September, in 

 shrubberies, forests, and on banks and heaths. 

 9. versicolor Meig. v. 4. p. 50. Meigen says is the female of 



P. diaphanus. 

 1^. hirtipes Curt. Middle of May, Dorset; and Putney. 



Length 3 lines: green; eyes reddish-brown and pubescent, 

 head, hypostoma and antennae black ; thorax and scutellum 

 sometimes chalybeous, abdomen silvery, 2nd and 3rd segments 

 with an ochreous spot on each side, pubescence and apex black, 

 with 2 ferruginous and 2 black hairy lobes; wings transparent; 

 halteresand legs ochreous; thighs rather stout, very hairy and 

 black as well as the tips of the hinder tibiae and tarsi, the latter 

 are merely brownish at the apex in the other feet. I only know 

 the males, which are distinguished from No. 1. by their larger 

 head and thorax, and all the thighs are entirely black and hairy. 



2. argyrius Meig. 3. argentinus M. 4. auricollis? M. 



5. vestitus Wied. End of July, Tollsbury, Essex. 



6. aulicusM. 7. quadrifasciatusjpfl;^. — Z*. July near Thetford. 

 8. leucocephalus M. — fulgens Hal. var. b. August, Isles of 



Bute and Arran. 



B. Perithinus and Plectropus //a/. Seta of Antennae 

 inserted at the apex, fig. 2 ? . 

 10. crassipesM(?z^. 12^. Wilsoni O^r/. -S.jE.j>Z. 541., female. 



I took both sexes on plants growing in Loch Fad in the Isle 

 of Bute, the beginning of last August, and have the pleasure of 

 dedicating this fine species to my esteemed friend James Wil- 

 son, Esq., of Edinburgh. 



13. communis Meig. v. 4. tab. 2>5-f. 6. 14. rufipes M. 



15. nemoralis M.? 16. thoracicus M. 17. pumilus M. 

 17^. decoratus Hal. — latipes Macq.l Isle of Arran, m. Aug. 

 18. riparius M. 18^. insulsus Hal. 20. fascipes M.'i 



21. obscuratus M. 23. pallipes Fab. 24. flavicollis M. 



C. Seta of Antennas inserted near to the base of the 3rd joint. 

 25. annulipes Meig. 27. flavicoxa Wied. 



28. flaviventris JVied. — moUiculus Fall. 



The Plant is Hjjdrocotyle (Helosciadium Koch) inwidata 

 (Floating White-rot). 



