Thrasymedes Kirkaldy, 1904

McKamey, Stuart H. & Wallner, Adam M., 2022, The immatures of the New World treehopper tribes Acutalini Fowler and Micrutalini Haupt (Hemiptera, Membracidae, Smiliinae), ZooKeys 1136, pp. 187-208 : 187

Thrasymedes Kirkaldy

Figs 18-22

Nymph diagnosis.

Body densely setose; with full complement of paired dorsal scoli from head to abdominal segment IX (12 pairs in total), though slender, not long and without stalked chalazae; abdominal segment IX as long as combined length of remaining abdominal terga; abdomen without scoli ventrolaterally.

Nymph description.

Overall body. Fifth instar length 8.5 mm. Cross-section subtriangular; thorax and abdomen densely covered with chalazae, distinct throughout body; chalazal setae long; scoli parallel. Head. With simple conical scoli, directed anterad; chalazal bases long-stalked; compound eye surface with setae; enlarged chalazae between eyes present as pair of vertical rows; setae of frontoclypeus dense; scoli length about 5-7 × basal width; enlarged chalazae in front of ventral margin of eye present; enlarged chalazae adjacent to central or dorsal margin of eye present; frons not extending over central margin of eye. Prothorax. Premetopidium scoli present, directed dorsoanteriorly; postmetopidium scoli present, directed anteriorly; posterior extension of pronotum surpasses anterior margin of metanotum, but does not attain1 its posterior margin; premetopidial scoli length about 5-7 × basal width; postmetopidial scoli length about 5-7 × basal width. Mesothorax. Dorsal scoli bearing stalked chalazae; scoli directed dorsoanteriorly and length about 5-7 × basal width; anterior basal side of scoli lacking cluster of enlarged chalazae; forewing pad anterior costal margin straight; forewing pad surface densely covered by long chalazae; forewing pad costal chalazae along entire costal margin; lateral rows, if present, most medial row extending unto meso- and metathorax. Metathorax. Scoli bearing stalked chalazae; scoli directed dorsally or almost so; dorsal scoli length about 5-7 × basal width. Legs. Chalazae of tibia present on both lateral margins and dorsal surface; prothoracic tibia form subcylindrical. Abdomen. Terga III-VIII ventrolateral margins each with 3 enlarged chalazae; terga III-VIII dorsal scoli length subequal to each other and bearing stalked chalazae; terga III-VIII tallest dorsal scoli length about 5-7 × basal width; tergum IV dorsal scoli preapically directed dorsally or almost so, apically dorsoposteriorly; terga III-VIII bearing 1 lateral row of slightly enlarged chalazae; lamellae absent. Segment IX: longer than combined length of remaining abdominal terga, but shorter than length of rest of body; preapically with dorsal surface irregularly covered in chalazae.

Material examined.

Thrasymedes pallescens ( Stål): 39 adults, 1 nymph, 4 5th instar exuviae, Mexico: Michoacán, Route 150, km 270, 40 km E Panindicuaro, 2150 m elev., 19°52'55"N, 101°24'45"W, 9 November 2001, S.H. McKamey leg. (USNM) .

Figures

Figures 18 - 22. Thrasymedes pallescens (Stal) 18 - 20 nymph in lateral, dorsal, and anterior views, respectively 21 detail of head and portion of prothorax, in lateral view 22 detail of abdominal segment IX (last visible segment), in dorsal view.