CICADELLINAE: PART 2. NEW WORLD CICADELLINI 597 
Abdomen of male with conspicuous slender, often capitate basal apodemes. 
Male genitalia: Pygofer moderately produced, posterior margin convex, 
with setae as in Ciminius. Plates not extending posteriorly as far as pygofer 
apex, varying interspecifically from gradually to abruptly tapered, with uni- 
seriate macrosetae and with microsetae also. Style extending posteriorly 
approximately as far as apex of connective, foot-shaped apically. Connective 
Y-shaped; aedeagus short, with a pair of slender processes arising basi- 
ventrally and extending dorsally over shaft. Paraphyses absent. 
Female (fig. 492) abdominal sternum VII short, with posterior margin 
transverse and rectilinear or slightly convex. Genital chamber without 
sclerites. Ovipositor with second valvula expanded beyond basal curvature, 
dorsal margin convex and bearing quadrate primary teeth from beginning of 
expanded portion almost to apex, the primaries, the dorsal anteapical, and 
the posteroventral margins bearing very minute secondaries. Pygofer with a 
number of macrosetae on apical one-third. 
Specimens belonging to the genus Plesiommata occur from Canada, and 
eastern and central U.S.A. to Argentina. Plesiommata is related to Ciminius 
Metcalf and Bruner, but differs markedly in its lack of paraphyses in the 
male, in having three anteapical cells in the forewing, and in having conspi- 
cuous abdominal apodemes that are truncate apically. 
P. corniculata, n. sp., has been collected on sweet potato in Ecuador, and on 
grasses by A. S. Costa, in Campinas, Brazil, and on avocado in the Panama 
Canal Zone by H. Morrison. Stearns (1927a:9) reported the food plant of P. 
tripunctata (Fitch) as oak in Virginia, and DeLong (1948a: 146) reported the 
same species from Muhlenbergia and ‘‘similar herbaceous plants”’ in Illinois. 
Mason and Yonke (1971b: 104) give additional plant species from which 
tripunctata was collected. P. mollicella (Fowler) was collected on grass in Costa 
Rica by C. H. Ballou. 
My identification of P. alcorni Beamer is based on a male paratype. 
The genitalia of a male, compared with the female lectotype of Tett:gonia 
mollicella Fowler, agreed well with figure 487d, e, g, p. 
The female lectotype of Tettigonia mollicula Fowler does not agree entirely 
with my illustration (fig. 491a) of the head and thorax in that the antero- 
lateral margins of the crown of the type are more convex and in that the apex 
of the crown is less acute in the type, but I consider these differences to be 
intraspecific. 
I have not seen type material of Tettigonia tripunctata Fitch, and follow 
Oman, Ball, and other authors in their determination of this species. 
Hamilton 1976a, because of discrepancies in Provancher 1889a, applied 
Plesiommata to a cercopid genus. The discrepancies he noted are actual, but 
this application of Provancher’s name results in accepting an Aphrophora with 
“les jambes postérieures avec leur double rangée d’épines’’ — no less in- 
congruous than the situation Hamilton sought to improve. I accept the 
nominal species Tettigonia tripunctata Fitch as type-species of Plestommata, 
following other North American authors. 
