1878.] HEMIPTERA OF ST. HELENA. 465 



Nysius sanctce-helence varies considerably both in the number and 

 intensity of tlie 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 editioribuscpie insulse — " 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 antenna? and legs. 



It does not appear to have been previously found out of Europe. 



Hapa, gen. nov. 

 Corpus oblongo-ovatum, parce hirsutum. Caput sulca transversa cur- 

 vata inter oculos anterius prceditum, inter oculos latum, modice pro- 

 ducturn, collari mediocri instructum, pone oculos Iceve nitidumque . 

 Antenna piloses, articulo 1° apicem capitis superante, 2° sursum 

 leviter incrassato, 3° 4°que filiformibus. Rostrum 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 trans- 

 verse 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- 

 nata, disco leviter concavo et leviter longitudinaliter rugose. 

 Elytra macropterorum apicem abdominis paullo superantia et 

 membrana obsolete 3-venosa. Elytra scepius tantum dimidio ab- 

 dominis cequilonga, membrana haud instructa. Femora antica 

 maris reliquis crassiora ; tibice anticce apicem versus distincte 

 incrassatce, margine inferiore serie brevissimarum spinularum 

 instructo ; tibice posticce spinis nonnullis setiformibus instructs. 

 Pedes femince graciliores, tibiis anticis haud incrassatis nee ut 

 in S 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 conlecto ad marginem sinistrum ; segmento genitali 

 ultimo (ut videtur) triangulari, levitur sinistrorsum contorto, 

 latere sinistro foramine calloso-marginato (quod fere cequilon- 

 gum est ac segmentum), instructo. Quarti segmenii abdominis 

 subttis margo posticus ad latus sinistrum profunde sinuatitm. 

 Abdomen femince symmetricum. Apex abdominis d" et ? pilis 

 nonnullis longis apicem versus instructus. 



