CICADELLINAE : PART I. PROCONIESTI 167 



usually attaining or exceeding transverse sulcus of scutellum; scutellum 

 transversely striate behind transverse sulcus. Forewing with membrane 

 including apical cells and apical portions of anteapical cells, veins 

 usually obscured before membrane, texture of clavus and corium 

 strongly coriaceous and conspicuously pitted, with four apical cells, 

 base of fourth more proximal than base of third, claval veins parallel, 

 the inner often obscure, without an anteapical plexus of veins and 

 without supernumerary veins to costa, wings at rest concealing ovi- 

 positor. Hindwing at rest extending almost as far posteriorly as apex 

 of forewing; vein R2+3 incomplete. Hindlegs at rest with knees not 

 attaining posterior proepimeral margins ; setal formula 2:1:1 or 

 2:1:0, rarely 2:1:1:1; first tarsomere with length equal to or greater 

 than second plus third. 



Male genitalia: Pygofer moderately produced, rounded or angulate 

 at apex, with setal pattern variable interspecifically, often with several 

 macrosetae interspersed among the microsetae, with a process arising 

 on each side on ventral margin before apex. Plates separate throughout 

 their length, length in relation to pygofer apex variable interspecifically, 

 triangular, with numerous dispersed microsetae and a few interspersed 

 macrosetae. Style extending farther posteriorly than apex of connective, 

 with preapical lobe, apex variable interspecifically. Connective 

 papilioniform or Y-shaped, the arms widely divergent, keeled medially 

 or not. Aedeagus symmetrical, shaft stout, processes absent or present 

 and variable interspecifically. Paraphyses absent. 



Female abdominal sternum VII with posterior margin usually 

 shallowly emarginate and with a slight median lobe within the emar- 

 gination. 



Species of Tretogonia are drab, brownish to fuscous in color, frequently 

 strongly pruinose. The presence of a yellow spot on the face is variable 

 within some species, possibly constant in others. The sclerites of the 

 membrane of the female genital chamber may be found eventually to 

 be characters of specific value. Specimens belonging to this genus have 

 been studied from the region from Panama to Argentina. 



The present interpretation of T. pruinosa (Walker) is based on a male 

 specimen from the collection of Carlos Berg and determined by Berg. 

 The abdomen is missing from Walker's holotype in the British Museum 

 (Natural History). T. tomentosa (Distant) is not illustrated here; the 

 genitalia of a male topotype compared with the lectotype are like 

 T. pundatissima Melichar except the style apices, which are like those 

 of T. notatifrons Melichar, and the pygofer processes in ventral aspect, 

 which are like T. costalimai, new species. 



The holotype of T. lateritia (Taschenberg) is a female and very close 

 to T. crihratn Melichar, perhaps synonymous with tlie latter. The male 



