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Show 1878.] HEMIPTERA OF ST. HELENA. 465 Nysius sanctce-helenee varies considerably both in the number and intensity of the darker markings. Sometimes the whole of the clavus and disk of the corium are fuscous with pale spots, and the apical margin entirely infuscated ; but the widened anterior margin of the corium is almost always immaculate, except that sometimes there is a dark streak near the apical margin. This species belongs to the section a a of the genus Nysius in Stal's ' Enumeratio ;' but it does not appear to be very closely allied to any of the species therein placed. 5. NYSIUS THYMI, Wolff. Hab. in intermediis editioribusque insulae-" Plantation," " West Lodge," et ad " Diana's Peak." I cannot find any points of distinction between British and St.- Helena specimens of this common and variable European species, except that the latter seem to be rather smaller and to have more slender antennae and legs. It does not appear to have been previously found out of Europe. H A P A , gen. nov. Corpus oblongo-ovatum, parce hirsutum. Caput sulca transversa curvata inter oculos anterius preeditum, inter oculos latum, modicepro-ducturn, collari mediocri instructum, pone oculos leeve nitidumque. Antennee pilosee, articulo 1° apicem capitis superante, 2° sursum leviter incrassato, 3° 4°que filiformibus. Bostrum medium mesosterni attingens, articulo 1° oculos attingente. Pronotum haud vel obsoletissimo collari instructum, transversum, apice truncato, basi levissime concava, angulis anticis rotundatis et maxime depressis, lateribus acutis; discus anterius convexo transverse rugosus, posterius depressus et leviter concavus ante angulos posticos, ad medium sulco longitudinali plus minus obsoleto instructus. Scutellum anguste transversum, ad basin convexum concavum ad marginem utrinque pone basin, apice leviter acumi-nato, disco leviter concavo et leviter longitudinaliter rugoso. Elytra macropterorum apicem abdominis paullo superantia et membrana obsolete 3-venosa. Elytra scepius tantum dimidio abdominis cequilonga, membrana haud instructa. Femora antica maris reliquis crassiora; tibiee anticce apicem versus distincte incrassatee, margine inferiore serie brevissimarum spinularum instructo ; tibiee posticee spinis nonnullis setiformibus instructee. Pedes feminee graciliores, tibiis anticis haud incrassatis nee ut in <$ formatis. Quartum et sequentia segmenta abdominis maris sinistrorsum asymmetrica, supra 4°, 5° 6°que abdominalibus et 1° genitali segmentis sinistrorsum maxime abbreviatis; segmento 1° genitali fere contecto ad marginem sinistrum; segmento genitali ultimo (ut videtur) triangulari, levitur sinistrorsum contorto, latere sinistro foramine calloso-marginato (quod fere eequilon-gum est ac segmentum), instructo. Quarti segmenti abdominis subtus margo posticus ad latus sinistrum profunde sinuatum. Abdomen feminee symmetricum. Apex abdominis 8 et $ pilis nonnullis longis apicem versus instructus. |