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Show 1878.] HEMIPTERA OF ST. HELENA. 463 Aphides and Cocci. Of the 30 determinable species in Mr. Wol-laston's collection 5 species- Nabis capsiformis, Germ., and Issus coleoptratus, F., Nezara viridula, L., Lyctocoris campestris, F., Lygus apicalis, Meyer, have been probably introduced since the island was discovered. The species which I have referred to Nysius thy mi, Wolff, may also be an introduction ; but I am more inclined to consider it a native. The remaining 24 species seem to be all peculiar to the island; and for the reception of 10 of them I have been obliged to create 7 new genera and 1 new subgenus. Mr. Wollaston has not, unfortunately, recorded for the Hemiptera, as he has done for the Coleoptera, the special modus vivendi of each species ; but as the particular part of the island inhabited by each was briefly noted by him, I have been careful to give all the information I can. MEGARHAPHIS, gen. nov. Genus Macrorhaphidi valde affine. Caput apice subtruncatum, lobis cequilongis. Bostrum articulo 2° 4°que subeequilongis, 3° longioribus. Thorax marginibus lateralibus subcal-losis, vix tranversim rugosus. Scutellum parte apicali retrorsum angustata, frenis ultra medium scutelli continuatis. Carina mesosternalis mediocris, nee lata nee sulcata. Venter spina basali tonga compressa. armatus, apud marem maculis sericeis haud instructus. Femora antica subtus apicem versus spina parva armata. Tibiee anticce vix dilatalce. Membrana costis instruct a. There is no doubt that Megarhaphis is closely allied to Dallas's genus Macrorhaphis ; but it seems to me that the characters pointed out above are of importance sufficient to necessitate the creation of a new genus for the species described below. The difference in the comparative proportions of tbe joints of the rostrum, the narrow and unfurrowed keel of tbe mesosternum, the absence of the two silky spots on the venter of the male, and other points will at once distinguish Megarhaphis from Macrorhaphis. 1. MEGARHAPHIS WOLLASTONI, sp. n. M. elongata, rufo-brunnea, rude et dense nigro-punctata ; thoracis angulis lateralibus prominulis obtusiusculis; pedibus corpore concoloribus ; antennis paullo pallidioribus ; capitis lineis ocellos includentibus, marginibus tyli, vitta capitis subtus sternicpie, maculis marginalibus dorsi abdominis, nebulisque ventris nigris ; spina basali vent rati ad apicem testacea; membrana brunneo-fusca. Capitis lineis 2 longitudinalibus inter ocellos ad apicem currentibus, margine interiore orbitce, tyloque, pronoti callis irregularibus prope marginem anticum, necnon carina longitudinuli angusta, scutelli linea apicali longitudinuli subelevata, corii spatiis irregularibus (una ad medium, altera apicem), haud vel vix punctatis; sterno ventreque minus dense |