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Show 150 DR. E. BERGROTH ON STRIDULATING [May 16, 16. O n c o c o r is s u b s im i l i s Mont. victoria. 0. subsimilis Mont. Bull. Soc. Sc. Bucarest, xii. p. 293 (1903). 17. O n c o c o r is t r a n s v e r s u s Carp. Murray Isl. Dictyotus transversus Carp. Proc. Roy. Dublin Soc. vii. p. 138, pi. xii. f. 1 (1891). 18. O n c o c o r is t r u n c a t e l l u s Walk. Australia. Eysarcoris truncatellus Walk. Cat. iii. p. 558. Dictyotus truncatellus Dist. Ann. & Mag. Nat. Hist. (7) iv. p. 434 (1899). 19. O n c o c o r is v e n t r a l i s Walk. North Australia. Morrnidea ventralis Walk. Cat. iii. p. 555. Dictyotus ventralis Dist. Ann. & Mag. Nat. Hist. (7) iv. p. 434 (1899). The species of Oncocoris are very similar in fades to those of Dictyotus, but, apart from the stridulatory patches, are easily distinguished by having the antenniferous tubercles visible from above and the metasternal orifice prolonged in a keel. Before proceeding to describe some new forms of this group, I may remark that in Oncocoris and Commius the " spicula stridulatoria " are arranged in a single straight row, whilst in Platycoris and Niarius they are placed in two or three irregular rows. The other described genera of the group are unknown to me. N i a r iu s t r y o n i , sp. n. Ovatus, opacus, niger, subtiliter sat dense punctulatus, supra callulis minutis Jiavidis conspersus, vitta superiore posteriore et margine angusto laterali capitis, basi hujus subtus, basi articuli primi, tertii quartique antennarum, rostro (articido ultimo excepto), limbo laterali prothoracis et partis basalis corii, epipleuris, macula prope angidos basales et apice scutelli, macula oblonga laterali intus rotundata segmentorum abdominalium, acetabulis pedibusque (annulo anteapicali femorum excepto) flavo-ochraceis, ventre medio impunctato, dilute piceo, nitido. Articulus primus antennarum apicern capitis haud attingens, secundus duobus ultimis unitis requilongus, tertius et quartus subceque longi. Pronotum lateribus leviter sinuatum. Scutellum apice impunctatum. Hemelytra apicem abdominis attingentia, corio basin segmenti sexti connexivi superante. Segmentum genitale maris medio segmentis tribus prrecedentibus unitis subcpquilongum. (Pedes postici desunt.) Long. 3 10 mm. Queensland. Allied to JV. illuminatus Dist., but in Distant's species the |
