Erosne Stal

McKamey, Stuart H., Wallner, Adam M. & Porter, Mitchell J., 2015, Immatures of the New World treehopper tribe Amastrini (Hemiptera, Membracidae, Smiliinae) with a key to genera, ZooKeys 524, pp. 65-87 : 73

Taxon classification Animalia Hemiptera Membracidae

Erosne Stal Figs 23, 51

Diagnosis.

Head and thorax without scoli; posterior extension of pronotum slightly surpassing anterior margin of metanotum; terga III-VIII with paired, short, chalazal scoli of subequal size; body including wing pad densely covered with chalazae bearing short setae.

Nymphal description.

Overall body. Chalazal setae short; dorsal contour of abdomen in lateral view curvilinear. Head. Scoli absent; chalazal setae simple, needlelike; Prothorax. Pre- and postmetopidium without scoli; posterior extension of pronotum slightly surpasses anterior margin of metanotum. Mesothorax. With paired cluster of enlarged chalazae dorsally; scoli absent; forewing pad anterior costal margin straight; forewing pad chalazae dense, chalazal setae short; forewing pad costal chalazae only present at base. Metathorax. With paired cluster of enlarged chalazae dorsally; scoli absent. Legs. Chalazae of tibia on anterior and posterior lateral margin and dorsal surface. Abdomen. Terga III-VIII ventrolateral margins with single enlarged chalaza; dorsal scoli all subequal in size, tallest dorsal scoli about 2-4 5 basal width; tergum IV dorsal scoli basally directed dorsally or almost so, distally directed posteriorly; terga III-VIII lateral rows not manifested; tergum III with paired dorsal, apically acute scoli. Segment IX. Dorsal length subequal to combined length of segments V-VIII; dorsally without enlarged chalazae or scoli at apex; ventral extension subequal to dorsal extension.

Material examined.

Erosne sp., 2 adults, 1 exuvia, VENEZUELA: Ed. Merida Lagunillas, 17 July 1984, S.H. McKamey, Coll. (USNM).

Distribution.

Brazil to northern South America.

Discussion.

At present, the only feature found to distinguish Erosne nymphs from Amastris is the slightly further posterior extension of the pronotum in Erosne , which is undoudtedly coupled with the more extensive pronotum in the adults. The Erosne species examined is new.