FAM. MEMBRACIDiE 141 



pronotum punctate but not ridged, extending downward to cover alinost all of the tegmina; posterior 

 process heavy, tectiform, acute, reaching almost to tipsof tegmina. Tegmina less than one-fourth expos- 

 ed; hyahne with basal and costal areas punctate; iive apical and two discoidal cells; median apical cell 

 elongate and stylate ; apical limbus narrow. Legs simple ; hind tarsi longest. 



Type unicariuata Stal. 



Geographical distribution : The genus is represented by a single South .American species. 

 I. Miicarinata Stal, Rio Jan. Hem. II : 29. i (1862). — Pl. 7, fig. 99. Brazil. 



114. GENUS IDIODERMA Van DUZEE 



Idioderma Van Duzee, Florida Hem. 208 (igog). 



Characters ; This genus is very close to the preceding and may eventually prove to be a syno- 

 nym of Hygris but until more species are described in both genera and until more material is available 

 for study, we prefer to consider it distinct. The three described species are all very small, elongate, 

 inconspicuous insects with the foUowing characters which may be considered to be generic. Head sub- 

 quadrate, more than twice as broad aslong; base strongly arcuate, depressed in middle; eyes globular; 

 ocelli conspicuous, equidistant from each other and from the eyes and situated on a line drawn through 

 centers of eyes; inferior margins of gense strongly sinuate; clypeus extending for half its length below 

 inferior margins of genas. Pronotum low, convex; dorsum almost straight; metopidium sloping, 

 wider than high ; no suprahumerals; humeral angles weak, auricular, rounded; median carina faintly 

 percurrent; sides of pronotum punctate but not ridged, extending downward to cover about half of the 

 tegmina ; posterior process convex, pointed, extending almost to tips of the tegmina. Tegmina hya- 

 line; about half exposed ; five apicaland two discoidal cells; median apical cell triangular and petiolate; 

 apical margin moderate. Legs simple; hind tarsi longest. 



Type viresccns Van Duzee. 



Geographical distribution ; This genus has been reported only from southeastern United 

 States and from the West Indies as follows : 



I. picta Osborn, Ann Ent. Soc. Amer. XIX : 36o(ig26). Cuba. 



2 varia Van Duzee, Florida Hem. 208. 255 (igog). Florida. 



3. virescens Van Duzee, Florida Hem. 208. 255 (igog). Pl. 7, fig. I 00. Florida, Cuba. 



115, Genus EROSNE Stal 



Erosne Stal, Bid. Memb. Kan. 240 (i86g). 



Characters ; Superficially the insects of this genus greatly resemble thoseof the genns Amastris 

 but may be distinguished by the facts that the corium has only two discoidal cells, the median apical cell 

 is triangular, and the basal and costal areas of the teginina are densely punctate. Head roundly trian- 

 gular ; base arcuate and feebly sinuate ; eyes ovate ; ocelli conspicuous, farther from each other than from 

 the eyes and situated on a line drawn through centers of eyes; inferior margins of genae rounded; clypeus 

 projecting only slightly below margins of genae and carrying out the rounded outline of the face made 

 by these margins. Pronotum elevated, compiessed lateraily, highest in front; metopidium veitical, 

 higher than wide; no suprahumerals; humeral angles stiong, triangular, blunt; median carina strongly 



