Mr. W. L. Distant on Homoptera. 59 



D. Head with the front not twice as broad at base as 

 anterior margins of the lobes of vertex ; rostrum 

 reaching, sometimes passing, the posterior coxae ; 

 opercula long, at least reaching centre, and some- 

 times apex, of abdomen. 

 d. Abdomen short, about as long as space between 

 apex of head and base of cruciform elevation. 

 e. Head as long as breadth between eyes. 

 /. Lateral margins of head obliquely con- 

 tinuous to front or very slightly sinuate, 

 g. Head (including eyes) as wide as base of 

 mesonotum. 

 h. Opercula in S broad, either just or 

 longly passing middle of abdomen, 

 well separated, and not overlapping, 

 more or less concavely sinuate on 

 each side at basal area, their apices 

 roimded or obliquely truncate. 

 t. Greatest breadth of tegmina about 



a third of length Cosmopsaltria. 



ff. Anterior margins of vertex of head almost 

 at right angles to front. 

 a. Greatest breadth of tegmina more 



than one third of length Fatima. 



gg. Head (including eyes) only about two 

 thirds the breadth of base of meso- 

 notum Saicda. 



ee. Head much shorter than breadth between 

 eyes. 



hh. Opercula in c? about twice as broad 

 at apex than at base, their inner mar- 

 gins concave, widening to basal area, 

 outer mai'gins sinuate near centre, 

 their apices broad and overlapping . . Ayesha. 

 hhh. Opercula in S broad, their inner mar- 

 gins contiguous, nearly equally broad 

 throughout, their apices broad, the 

 outer margins very obsoletely sinuate. Haj^hsa, 

 dd. Abdomen considerably longer than space be- 

 tween apex of head and base of cruciform 

 elevation. 

 t. Head (including eyes) about as wide or a little 

 wider than base of mesonotum. 

 /. Head about as long as breadth between eyes. 

 k. Pronotum measured centrally almost as 

 long as mesonotum excluding cruciform 

 elevation, its lateral margins always 

 distinctly, strongly, and generally 

 acutely toothed. 

 /, Opercula elongate, concavely sinuate 

 on each side near base, their apices 

 rounded or obtusely acute, occupying 

 lateral abdominal areas, and always 

 well separated at their inner margins. Platylomia. 

 jj. Head distinctly shorter than breadth be- 

 tween eyes. 

 kk. Pronotum measured centrally distinctly 



