6 THE CANADIAN ENTOMOLOGIST 



NOTES ON THE DELFHACID^ IN THE BRITISH MUSEUM 



COLLECTION. 



BY F. MUIR, HONOLULU, T. H. 



When tabulating the genera of Delphacidse* I was unable ta place some 

 genera with any certainty, as I was only acquainted with them through descrip- 

 tions, which did not mention the characters which I used for primary divisions. 

 Thanks to the kindness of the British Museum authorities I have been able to 

 examine the Delphacidce in their collection and to make the following notes 



upon them. 



I wish to point out that Delphacodes Fieb. {DelpJiax and Liburnia of some 

 authors) and allied genera are difficult to deal with, and unless great care be 

 exercised, confusion will arise whenever one goes beyond a comparatively small 

 faunistic area. The species of these genera can only be identified with any 

 certainty by the use of the genitalia; not only should the characters found in the 

 pygofer, anal segment and genital styles be used, but the aedeagus or penis 

 should be dissected out. Many species have a wide geographical distribution 

 and a large range of colour variation, which has led to synonymy. The demarc- 

 ation between Delphacodes Fieb. and its allies is not definitely settled, and will 

 not be until a study of species from various parts of the world shows us the 

 range of variation within the genera. It is, therefore, with reservation that 

 one must synonymize at the present time. 



Canyra Stal. 



The four species standing under this name, C. strignlosa Walk., C. revertens 

 Walk., C. retrahens Walk, and C. vittifrons Walk, are the same as Ugyops, but 

 they have a longitudinal depression along the first joint of the antenna?. I have 

 not seen the type species of the genus. 



Epibidis Fowler. 



This genus is congeneric with the four species under Canyra and has the 



first antennal joint sulcate. 



Ugyops Guein. 



Delphax longicornis Walker and Delphax media Walker, both belong to this 



genus. 



Consualia Distant. 



I cannot separate this from Ugyops. 

 Onkelos Distant. = Punana Muir. 

 liburnia White. = Nesosydne Kirkaldy. 



Delphax simulans Walk, belongs to this genus. 



Ilbur?iia nephelias (Kirk.) =/. disjuncta (Muir). 



Ambarvalia Distant. 



The tibial spur is cultrate, half the length of the first tarsus, convex on both 

 sides, with three teeth on the hind margin. The spur places this insect m 

 the i/oMwi. otherwise the insect has a superficial resemblance to the Tropido- 

 cephalini. 



Upachara Distant. 



The genus has the spur small, thick, with a tooth at the apex, but none on 

 *Canadian Entomologist 1915, page 296 e. o. 

 January, 1919 



