In the structure of the antennas this genus approaches Beris 

 {pi. 337.); ^^^^ it is remarkable that Meigen, Leach, and 

 Samouelle, have described them as triarticulate, for, including 

 the seta, they are composed of 8 joints. Within the last 3 

 years the British species of this pretty group have been more 

 than trebled. 



1. O. pulchella Meig. 3. pi. 25. / 29. — hypoleon Don. 5. 



146. 2. 

 From May to August flowers in meadows; gardens near 

 London; Elder bushes, and amongst rushes, Battersea, J. C; 

 Glanville's Wootton, Puddletown and Lyme Regis, Dorset, 

 and Teignmouth, Devon, J. C. Dale, Esq. 



2. O. trilineata Fab. — Don. 5. 151. 5. — Pa7iz. 1. 13.— pan- 



therina Lmn. 

 Middle of June and July, Teignmouth and Barum, Devon; 

 Puddimore Milton, Somerset; Glanville's Wootton, and near 

 Lyme Regis, Dorset, Mr. Dale ; amongst Elder leaves, Bat- 

 tersea meadows, Mr. Donovan. 



3. O. formosa Wied. — muscaria Meig. — Panz. 108. 15. & 16. 



c? & ?. _ ^ 



Middle of June, beginning of July, Glanville's Wootton, 

 and near Lyme Regis, Mr. Dale ; on Sallows in hedges, J. C. 



4. O. pardalina? Meig. pi. 25. f. SO. & 31. 

 July ; Pinny near Lyme Regis, Dorset. 



5. O. Morrisii Dale's MSS.—Curt. Brit. Ent.pl. 441. 

 This beautiful species has been named by Mr. Dale in ho- 

 nour of F. O. Morris, Esq., who first discovered the former 

 species : this was also taken near Lyme Regis. 



6. O. muscaria Fab. — pygmaea Fall. 



End of May, Isle of Portland; July, Charmouth, Lyme 

 Regis, and at Seaton, Devon, in great plenty, Mr. Dale. 



7. O. affinis Dale's MSS. 



Found in company with the last, of which it may be only a 

 variety ; it has the scutellum partly or entirely black; Mr. Dale. 



8. O. leonina Panz. 58. 21. 



A female taken at Pinny by Mr. Morris. 



9. O. analis Meg., Meig. 



From June 18th to July 1st, Glanville's Wootton, Mr. Dale; 

 on small Oaks in a copse, J. C. 



10. O. terminata Meg., Meig. 



June and July, at Pinny, Mr. Morris; in a hedge with 

 O. pardalina, J. C. 



The Plant is Epipactis ovata (Common Twayblade). 



