1894.] Species of Medicago L. in England. 149 



the fertilisation of this plant, I noticed that, at Scarborough, there 

 were certain plants growing with the others, of more erect habit, 

 which did not close their flowers at night, or only partially so. 

 This variation I have under study. 



The stigma when young requires rubbing to render it 

 fertile, but as it gets older it becomes receptive. Hence 

 plants covered with a net set seed, as Darwin^ pointed out. Re- 

 peating the experiment I get the same result : while in the open 

 95°/o of the flowers set seed: under a net about 75°/o did so, the 

 seed of which germinated well. 



Insect visitors at Scarborough (Sc.) between June 22nd and 

 July 3rd, 1893, and at Cambridge (Camb.) through July and 

 August. 



Hymenoptera aculeata: — 1. Apis mellifica L$ (Sc. and 

 Camb.) seldom. 2. Bombus hortorum L. (Sc). 3. Andraena 

 parvula Kirby. $ (Sc). 4. Halictus morio F. ^f ? (Camb.) not 

 unfrequent. 5. H. minutissimus Kirby ^ (Camb.). Tere- 



brantia. 6 — 11. Six species undetermined (Sc.) 



Lepidoptera: — Heterocera : — 12. Mianaf asciuncula }i.a:W. 

 (Sc). Tortrices : — 13. Tortrix s^A (Camb.). 14. Toy^trix s^J. 

 (Sc). Crambi : — 15. Cramhus pratellus h. {^c). Pyralides : — 

 16. Pori^ectai'ia sp. ? (Camb). 



Coleoptera: — it. Anthobium torquatum Marsh (Sc). 18. 

 Meligethes aeneiis F, (Sc). 19. Ceuthorhynchidius fioralis 



Payk. (Sc). 



Diptera: — Bibionidae : — 20 Scatopse brevicornis Mg. (Sc. and 

 Camb). Cheironomidae : — 21. Gheironomus sp. (Sc). Tabani- 

 dae : — 22. Symphoromyia crassicornis Pz. (Sc). Empidae : — 

 23. E7npis punctata Mg. (Sc). Syrphidae: — 24. Paragus tibialis 

 Fin. (Camb.). 25. Pipizella virens F. (Camb.). 26. Platy- 

 chirus manicatus Mg. (Sc). 27. P. albimanus F. (Sc). 28. 

 P. scutatus Mg. (Camb.). 29. Syrphus balteatus Deg. (Camb.). 

 30. S. corollae F. (Sc. and Camb.). 31. Syritta pipiens L. 

 (Camb.). Tachinidae : — 32. Myobia inanis Fin. (Camb.). 33. 

 Siphona geniculata Deg. (Camb.). 34. S. cristata F. (Camb.). 

 Sarcophagidae : — 35. Sarcophaga sp. (Camb.) very abundant. 

 Anthomyidae : — 36. Hydrotea irritans Fin. (Sc) 37. Pogono- 

 myia alpicola Rud. ? (Sc). 38. Hylemyia puUula Ztt. (Sc. and 

 Camb.). 39. Anthomyia sp. (Camb.). 40. Ghortophila 



ciiierella Fin. (Camb.). 41. G. sepitorum Meade. (Camb.). 



42. Ghortophila sp. (Sc). 43. Homolomyia armata Mg. ? (Sc). 

 44. Garicea tigrina F. (Sc. and Camb.). Scatophagidae : — 45. 



Scatophaga stercoraria L. (Sc). Sepsidae : — 46. Sepsis cynipsea 

 L. (Camb.). 47. Hydrellia griseola Fin. (Camb.). Chloro- 

 pidae : — 48, 49, 50. Ghlorops 3 sp. (Camb.). 51. Ossinis sp.? 



1 Henslow. On the Structure of Medicago. J. Linn. Soc. (Bot.) ix. p. 328, 1867. 



