ON SOME NEW SPECIES OF LEAF-HOPPER 

 (PERKINSIELLA) ON SUGAR CANE. 



Pekkinsiella Kirkaldy. 



This genus was erected by Kirkaldy for sacclniricida in 1903. 

 It differs from Dicranotropis in the first joint of antennae being 

 Ijroader at the apex than at the base and both joints somewhat 

 flattened, not cylinch-ical, also in the presence of two spines on 

 ventral margin of pygophor. The genus is particularly attached 

 to sugar cane (Sacchanini officimintm ), only occasionally going 

 on to other grasses. The thirteen known species are (listril)uted in 

 the following manner : — 



New Guinea 6, Amboina 3, Ceram 1, Java 4, Uorneo 3, Aus- 

 tralia 2, Fiji 2, Hawaiian Islands 1 (introduced), China 1. 



From this it appears that it is a Malayan genus with its center 

 in New Guinea. Considering the amount of sugar cane taken 

 from island to island in native boats, it is surprising that some of 

 these species have such a restricted range. 



The males are best distinguished by the genitalia, otherwise the 

 species may be separated as follows : 



1. Frons concolorous. 2 

 h>ons darker between eyes than below. 5 



2. \'ertex, pronotum, and scutellnm lighter than 



frons and cly])eus. fiiscifrons 



\ ertex, pronotum, and scutellnm not lighter 

 than frons and clypeus. 3 



3. N'eins on tegmina ai)parcntl\- white, sjxirsely 



granulated. vastatrix 



X'eins on tegmina apparently dark, closely gran- 

 ulated. 4 



4. Median, radial, and cubital cells clear; longi- 



tudinal markings on femora very faint. amboiiicnsis 



]\Iedian, radial, and cubital cells dark ; longi- 

 tudinal markings on femora plainer. lalokcnsis 



