CICADELLINAE: PART 2. NEW WORLD CICADELLINI 481 
are usually uniseriate when present (exceptions: M. grapta, n. sp., M. tolosa 
(Distant), M. ludtcula (Osborn), in all of which macrosetae are multiseriate), 
with microsetae variously distributed. Style variable interspecifically, extend- 
ing farther posteriorly than apex of connective, with or without preapical lobe. 
Connective variable interspecifically. Aedeagus symmetrical, rounded or trun- 
cate apically, without processes (exception: M. retrorsa, n. sp.). Paraphyses 
present and paired, or weak and membranous and unpaired, rarely absent. 
Female (known in only a few species, see discussion below) abdominal ster- 
num VII moderately elongate, with median portion of posterior margin 
produced posteriorly to a variable degree. Genital chamber without sclerotiza- 
tion in dorsal membrane. Second valvulae variable (see discussion below) but 
always acute apically. 
Mesogonia Melichar stands apart from other genera in the Cicadellini in that 
the lateral clypeal sutures do not extend to the ocelli, and usually do not ex- 
tend onto the crown, and in that there is usually a carina present separating 
the crown from the face. The reduction in number of setae of the male 
pygofer is also unusual in the Cicadellini. The form of the second valvulae of 
the ovipositor of some of the few female specimens known to me is that found 
in many cicadelline leafhoppers (see discussion below), and the departures 
from this condition now known are correlated with specimens which other- 
wise possess unusual characters within the genus. Because of similarities in 
males of some Mesogonia species to those of Juliaca Melichar, I have placed 
these genera close in this arrangement. The female genitalia, in the few 
species known, suggest a possible relationship to Stehlikiana, new genus. 
Of approximately 1,100 specimens studied, only six females were found: 
one each in Mesogonia vinnula, n. sp., M. olivatula (Osborn), and M. evansi, n. 
sp.; one in an unknown species that is very close to vinnula; and two in an un- 
known species which appears very teneral in color, but in which the ovipositor 
is well sclerotized. In the last two specimens, the second valvulae are narrow 
at their bases and gradually broadened to the apices which are as in the other 
three species. In these two colorless specimens, the dorsal primary teeth occur 
on only the apical half of the second valvula. They are conical in shape, di- 
rected posterodorsally, and there are minute secondary denticles between the 
primaries. In these same two specimens, there are a number of lightly 
sclerotized somewhat paleate dorsal denticles extending basally from mid- 
length, along the second valvulae to approximately the basal quarter of its 
length. In the three female specimens with normal color, the second valvulae 
are shaped like those in the vast majority of cicadelline leafhoppers, 
broadened abruptly near their bases, their dorsal margins bearing quadrate 
primary teeth and secondary denticles on the primaries throughout the length 
of the broadened portion except apically. The apices of the second valvulae of 
all of the females were alike, acute and with a number of minute angular den- 
ticles anteapically on both dorsoanteapical and ventroanteapical margins, a 
condition found in many other cicadelline genera. 
Specimens belongs to Mesogonia have been studied from western Brazil, 
Ecuador, Peru, and Bolivia. 
In a number of museums there are specimens of Mesogonia from Archidona, 
Ecuador labeled as cotypes of species attributed to Breddin on the labels. A 
