156 PERLIDES. 



the seventh forked. Len<^th of the body 5 lines ; of the wings 18 



lines. 



a, b. East Indies. Presented by J. W. Evans, Esq. 



Sub-group 3. 



Species magnitudine variae. Prothorax semper bicolor, angulis 

 rotundatis. 



Species above or below the middle size : prothorax with 

 rounded angles, always of two colours. 



Div. 1. 

 Prothorax fuscus vel niger, flavo marginatus. 



50. Perla cincta. 

 Al(B unicolores. 

 Perla cincta, Pictet, Hist. Nat. Neur. Perl. 229, 30, pi. 20, f. 5. 

 Vera Cruz. 



51. Perla bifasciata. 



Aim fasciis duabus conspicuis. 



Perla bifasciata (Klug. MSS.) Pictet, Hist. Nat. Neur. Perl. 230, 

 31,pl. 20, f. 6, 7. 



Columbia. 



Div. 2. 

 Prothorax flavus, nigro marginatus. 



52. Perla geniculata. 



Perla geniculata (De Haan, MSS. J Pictet, Hist. Nat. Neur. Perl. 

 232,32, pi. 21, f. 1, 2. 



Japan. 



