CICADELLINAE: PART 2. NEW WORLD CICADELLINI 509 
Holotype male, Monsén Valley, Tingo Maria, Peru, November 10, 1954 (E. 
I. Schlinger and E. S. Ross) (CAS). Four males, Rioja, Peru, (three in MMB, 
and one in USNM). 
M. monsonensis, n. sp., is closely related to M. cardinula (Osborn) from which 
it may be distinguished readily by its abruptly narrowed styles. 
Mesogonia lobata, NEW SPECIES 
FicurRE 418, pace 507 
Length of male 8.5-8.6 mm. Head with median length of crown from 
slightly more than one-half to slightly less than six-tenths interocular width 
and slightly less than one-third transocular width, ocelli located on a line be- 
tween anterior eye angles, crown with a shallow concavity arising between 
419e 
419d 

420p 
420e 

420d 
FIGURES 419, 420.—419, Mesogonia monsonensis, n. sp., holotype. 420, M. vex- 
ativa, n. sp., holotype: p, Male pygofer, right side, from dorsal view. 
