CICADELLINAE: PART 2. NEW WORLD CICADELLINI 499 
Crown and anterior portion of pronotum sordid yellow, posterior two-thirds 
of pronotum fuscous, scutellum dull fuscous to sordid dark yellow; forewings 
with clavus and a narrow subcostal stripe dull yellow, corium black in basal 
half; face and thoracic pleura black, legs brown. 
Holotype male, ‘Peru’? (RMS). 
M. brevicorne, n. sp., is related to M. ferrugatula (Breddin) from which it can 
be distinguished readily by the shape of the aedeagus, and externally by its 
lack of a membranous area on the base of the forewing. 
Mesogonia aliena, NEW SPECIES 
FiGuRE 411, PaGE 500 
Length of male 5.6 mm. Head with median length of crown three-fourths 
interocular width and slightly more than one-half transocular width, ocelli 
located behind a line between anterior eye angles, crown shallowly concave 
before ocelli and behind apical carina, lateral clypeal sutures extending onto 
crown, almost attaining ocelli; clypeus slightly flattened medially, muscle 
impressions distinct; face not pubescent beneath (possibly rubbed). Thorax 
with pronotum not wider than head, forewing coriaceous with veins distinct. 
Other external anatomical characters as in M. retrorsa, n. sp. 
Male pygofer not strongly produced, posterior margin subtruncate, with a 
few anteapical submarginal macrosetae near posterior margin; plates ex- 
tending much farther posteriorly than pygofer apex, without an anteapical 
dorsal lobe, each in ventral view abruptly tapered in basal half, with a num- 
ber of microsetae, dorsal surface of plate with a conspicuous sclerite extending 
over basal third; style extending posteriorly much farther than apex of 
connective, without preapical lobe, abruptly narrowed in apical portion to 
subacute apex which is at nearly a right angle to axis of shank; connective 
semi-oval, with a sclerotized Y-shaped portion; aedeagus short, its dorsal 
apodemes each with a short lobate anterior projection, expanded abruptly at 
midlength to a broad truncate apex, without processes; paraphyses consisting 
of a broad basal piece and a pair of slender aciculate and slightly divergent 
rami. Female unknown. 
Crown and anterior third of pronotum dull yellow, latter tinged with 
orange medially, with anterior margin of crown from apex to lateral clypeal 
suture on each side, and a median marking extending from base to just before 
ocelli and rounded apically, black, posterior half of pronotum dull green 
(scutellum obscured by pin); forewing dull green except broad dull translu- 
cent brown claval area parallel to commissural margin, claval suture black, 
veins of corium yellow, costal margin broadly black with submarginal yellow 
stripe; face with clypeus and clypellus fuscous, except lower lateral areas of 
clypeus on each side which are yellow and concolorous with lora and genae; 
thoracic pleura yellow, mesepisternum marked with black; legs yellow to dull 
brownish. 
Holotype male, Archidona, Ecuador (R. Haensch) (MMB). 
M. aliena, n. sp., is related to M. paganula Jacobi), from which it differs in 
the relationship of the length of the plates to the length of the male pygofer 
