Syrphus being an extensive Fahrician group, containing the 

 most heterogeneous types, it is necessary, in accordance with 

 the objects of this work, to illustrate the genus, otherwise as 

 that portion of it which is now indicated by the title of Syr- 

 phus is closely allied to Scaeva (pi. 509), and the typical 

 species of Fabricius being synonymous with Volucella (pi. 

 452), it might have been very well passed over. The princi- 

 pal distinctions between Syrphus and Scasva are to be found 

 in the form of the head, and the greater length of the palpi. 

 The following list comprises those species most worthy of no- 

 tice, the remainder will be found in the Guide. 

 J. ruficornis Fab. — Panz. 77. 20. — July, Aug., Sept., trunks 

 of trees, Dover, and Heron Court : bred by the Rev. G. 

 T. Rudd from pupas found in red fungi at the base of oak- 

 trees. 



2. oestraceus Linn. — rupestris Pa7iz. 59. 13. 



July, on flowers by the sides of banks and ditches. 



3. chrysocomus Meig. v. 3. p. 280. 4. 

 Bottisham, Cambridgeshire, Rev. L. Jenyns. 



4. grossus Fall. — Corydon Harris. Expo. pi. 32. f. 36. 

 April, Covehithe, Suffolk: the abdomen was yellowish at 

 the base when alive. 



5. variai)ilis Panz. 60. 10. — ater andmgnia. Fab. 

 May, Battersea Fields, June, Darent, on flowers. 



6. nigrinus Meig. — Harris^ pi. S2.f. 37. 



7. nigripes Meig. — July, Deptford, Waller Clifton, Esq. 



8. Viduus Meig. — viduata Fab. — Bardus Harris, pi. 'il.f. 39? 

 June, Knaresborough, and Glanville's Wootton. 



11. scutellatus Fall. — Meig. pi. 30./ 29. 30.?. August, 

 Ramsdown. 



12. means Fab. — August, in Arran and Skye, Scotland. 



13. flavicornis Fab. — July, Coomb Wood. 



17. flavipes Panz. 54. 10. — June, Coomb Wood. 



18. albitarsis Meig. — May, Dorsetshire, J. C. Dale, Esq. 



19. antiquus Meig. — October, Heron Court. 



22^ maculatus Meig. — Ireland, A. H. Haliday, Esq. 

 24. Lucorum Linn. — Curt. Brit. Ent. pi. 753 ? . 



This differs so much in habit from most of the foregoing 

 species, that Macquart has placed it with his Syrphi, which 

 are our Scaevas, but it comes very near to S. oestraceus, next 

 to which, perhaps, it ought to be placed : it is found on white- 

 thorn flowers, but not commonl}^, in the spring. 



The Plant is Marrubium vulgare. White Horehound. 



