208 THE CANADIAN ENTOMOLOG.ST. 



Sixth dorsal segment not or only slightly angulated at sides, 



smaller insect; length up to 10 mm octodentata Say. 



6. Transverse depression on segment 2 widely interrupted in middle; 

 apical felt bands on segments 2 to 4 wide at sides, very nar- 

 row across middle on segment 1, very wide and triangular at 

 sides and widely interrupted in middle; punctures on seg- 

 ments 2 to 4 larger and less close; punctures on mesonotum 

 far enough apart to give it a slight shine; hair on basal part 

 of segment 1 adpressed; last dorsal segment about 1^ times 

 as long as wide ; tibial spurs more or less ferruginous . . lucrosa Cr. 



Transverse depression on segment 2 not or scarcely interrupted in 

 middle; apical felt bands on segments 2 to 4 less wide at 

 sides, less narrow in middle; on segment 1 much less wide at 

 sides and uninterrupted in unrubbed specimens; punctures 

 on segments 2 to 4 smaller and closer; mesonotum so closely 

 punctured as to appear dull; hairs on basal part of segment 

 1 upstanding; last dorsal segment about twice as long as 

 wide, tibial spurs black moesta Cr. 



A CONTRIBUTION TOWARDS THE TAXONOMY 

 OF THE DELPHACID^. 



BY F. MUIR. 



Hawaiian Sugar Planters' Experiment Station, Honolulu, T.H. 



When working out some Malayan Delphacidae the writer 

 found it expedient to tabulate as many of the genera of the family 

 as possible; unfortunately many of these genera are unknown to 

 him except through the descriptions, which, in many instances, do 

 not give characters necessary to locate them with accuracy. For 

 this reason the present table has many defects, well recognized 

 by the writer, but as it has been of great use to him he believes 

 it will be of use to others, and for this reason alone he publishes it. 



The Spur. As this organ is the characteristic feature of the 

 family it is not surprising that its shape should be of taxonomic 

 value; unfortunately many species have been described with only 

 a mere reference to its existence. The writer is not aware of any- 

 one making a primary use of it for dividing the family into 

 divisions or subfamilies before Kir'caldy, who was followed by 

 Crawford. 



July, 1915 



