the title of a tribe should be taken from the typical genus, or 

 that most generally known ; and moreover, the term Trineurae 

 is inapplicable to insects having five or six nervures in each 

 wing. 



Besides the following British species, Mr. F. Walker has 

 about sixteen undescribed. 



Div. a. Wings like fig. 9. 

 1 . P. incrassata Meig. tab. 63. /. 5. — In the spring under dead crows, &c., 

 Mr. Clifton. 



b. Wings similar to fig. 9, with the 2nd subcostal nervure 



furcate at the apex. 

 7. P. maculata Meig. 8. P. thoracica ia^. Gen. Crust, tab. 15./. 12. 



9. P. dimidiata Mei^r. 10. P. fuliginosa M. 11. P. urbana il/. 



13. P. gracilipes Meig. 14. P. annulata Meig. 

 15. P. rufipes F.—Meig. Klas. tab. 15. f. 23.— pallipes Lat. 

 17- P. lugubris Meig. 18. P. nigra Meig. 



20. P. pumila Meig. 25. P. lutea Meig. 



25^. P. atricapilla Curt. — Ochreous, head and eyes black ; abdomen with 

 the 3rd and 4th segments in the male, and the 4th only in the 

 female fuscous. 

 The late Mr. T. Carpenter found some pale-coloured mag- 

 gots hanging to the pupae of Coccinellae, which soon became 

 brown pupae themselves ; they remained attached by one end, 

 and in about a fortnight produced some of these flies. I have 

 taken them on windows in May and September, in Dorset 

 and the Isle of Wight. 



c. Submarginal nervure straight at the base. 

 26. P. crassicornis M. — Windows in November. 



d. Submarginal nervure curved at the apex. 



30. P. funebris M. 31. P. florea Fab. 32. P. hyalinata M. 



e. Submarginal nervure semiovate. 

 33. P. arcuata M. — rufipes Fall. 



g. Three marginal nervures only. 



37. P. aterrima Fab. Coq. tab. 24. /. 3.— atra Meig. Klas. tab. 15. f. 22. 



38. P. velutina Meig. vol. 6. tab. 63./. 11. 



39. P. stictica Meig. 39*. P. anthracina Curt. 



h. Submarginal nervure nearly straight. 



40. P. abdominalis Fall. — Curt. Brit. Ent. pi. 437. 



This species has never before been figured, and the neura- 

 tion of the wings was unknown to Meigen. It was taken the 

 7th of May, off a hedge outside Coomb Wood, by Waller 

 Clifton, Esq., and my specimen I purchased from Mr. Lee's 

 collection. 



i. Head and thorax very narrow and elongated. 

 42. P. galeata Hal. MSS. — " In the spring, and not later than the sum- 

 mer, at Belfast, on the wild Carrot. It is more agile than the 

 other Phorse." 



The Plant is Myosunis minimus (Little Mouse-tail). 



