Psyllidce from South America. 445 



arm of the cubitus ; distance between the apices of the 

 stigma and radius about equal to that between the latter 

 and the adjoining branch of the furcation, when measured 

 on the marginal nerve ; lower furcation large ; distance 

 between the apices of the branches about equal to either of 

 the former when measured similarly. Clavus with a short 

 black streak on the marginal nerve next the apex. Legs 

 yellow, with a slight fuscous shade. Abdomen black ; 

 side margins narrowly reddish ; genitalia black ; outer 

 margin of the genital plate, viewed from the side, slightly 

 convex ; inner margin slightly concave ; width at fhe 

 base somewhat less than at the apex ; height about one- 

 third more than the width at the base ; processes, short, 

 curved towards the genital plate, slightly tapering to- 

 wards the apex ; base about equal to the height. Length, 

 1 line (Paris). • ■ • 



The young live and develop in beautifully- shaped, 

 almost semiglobular, galls formed on the under side of 

 the leaves of Duvaua dependens, DC. 



Hah. Buenos Ayres. 



I'RIOZIN^. 



Neolithus.* 



Caput cum oculis pronoto latitudine sequale ; longitudo 

 ejus media latitudini dimidise fere sequalis. Lobi faciales 

 breves. Antenna breves, subincrassatse, ad dorsuli mar- 

 ginem posteriorem usque, vel ultra, extensse ; articulus 

 ultimus subclavatus. Pronotum angustum. Mesonotum 

 convexum, apud elytrorum insertionem capitecum oculis 

 duplo latius ; dorsulum antice in spinam longam utrinque 

 productum ; longitudo media latitudine brevior ; margo 

 posterior vix nisi semicircularis. Elytra nervuhs tribus, 

 apice plus minus late rotundata ; radius elongatus, apice 

 ipso aut prope apicem terminatus ; cellule costahs et 

 dorsalis breves ; cubiti brachium inferius perbreve ; clavus 

 parvus, angustus ; sutura clavalis tenuissima. 



Head, together with the eyes, as broad as the pro- 

 notum ; length down the centre about equal to half the 

 breadth. Face lobes short. Antennae short, somewhat 

 stout, reaching to or beyond the posterior margin of the 

 dorsulum; apical joint slight ly clavate. Pronotum 



* N£o?, new ; xi6o?, a gem. 



