258 U.S. NATIONAL MUSEUM BULLETIN 261 



anterior margins steeply declivous; clypeus varying interspecifically, 

 most often convex, flattened or depressed in a few species, muscle 

 impressions distinct; face pubescent or not; clypellus not produced, 

 its contour continuing profile of clypeus. 



Thorax with width of pronotum less than transocular width of head, 

 lateral margins parallel, disc usually smooth, rarely minutely rugose 

 or punctate, posterior margin concave, with a complete dorsopleural 

 carina which is diagonally rectilinear or arched slightly downward at 

 midlength ; scutellum without striae. Forewing varying from completely 

 hyaline, or hyaline with a few coriaceous areas, to coriaceous with a 

 membrane, veins distinct, occasionally elevated, surface rarely punc- 

 tate, with four apical cells, the base of the fourth more proximal than 

 base of third, without supernumerary veins in corium, rarely with few 

 supernumerary crossveins in clavus, wings at rest concealing ovipositor 

 in female, in some species leaving apex of pygofer exposed in male. 

 Hindwing extending almost as far posteriorly as apex of forewing, vein 

 Rj+s interrupted. Hindlegs with setal formula usually 2:0:0, rarely 

 2:1:1 or 3:0:0; first tarsomere with length greater than combined 

 length of second and third tarsomeres. 



Male genitalia: Pygofer very strongly produced posteriorly, with 

 numerous dispersed microsetae except in basal portion, without 

 processes. Plates united at base in some species, not extending nearly as 

 far posteriorly as pygofer apex, triangular, with numerous dispersed 

 microsetae. Style usually extending posteriorly farther than apex of 

 connective, usually without preapical lobe, variously modified at 

 apex. Connective variable interspecifically, from Y-shaped to linear, 

 without a median keel. Aedeagus symmetrical, slender and elongate, 

 without basal processes, shaft often with apical processes or bifid 

 apically. Paraphyses absent. Anal tube often with an unpaired ventral 

 process, occasionally with base of tube modified and with sclerotized 

 processes, or with a pair of laterotergites. 



Female abdominal sternum VII produced laterally, posterior margin 

 from slightly to deeply emarginate. 



The relationship of Acrogonia to other genera is unknown. Species 

 occur from Central America to southeastern Brazil and to Bolivia. 

 The males are easily recognized in collections by the elongate pygofer 

 which often is not completely concealed by the wings in rest position. 

 There is a great deal of intraspecific color variation. The flattened form 

 of the posterior tibiae and the slender, close-set setae of row 1 of the 

 posterior tibiae suggest a relationship to the Cicadellini. 



The identity of Acrogonia sparsuta (Signoret) is unknown. None of the 

 specimens in NMV are eligible as lectotypes, and no specimens were 

 sent with the Signoret types from HU. Specimens determined by Meli- 



