150 DR. E. BERGROTH ON STRIDULATING [May 16, 
16. Oncocoris suBsIMILIS Mont. Victoria. 
O. subsimilis Mont. Bull. Soe. Se. Bucarest, xii. p. 293 (1903). 
17. ONCOCORIS TRANSVERSUS Car'p. Murray Isl. 
Dictyotus transversus Carp. Proc. Roy. Dublin Soe. vu. 
p. 138, pl: xa £1 (US3p): 
18. ONCOCORIS TRUNCATELLUS Walk. Australia. 
Eysarcoris truncatellus Walk. Cat. 111. p. 558. é 
Dictyotus truncatellus Dist. Ann. & Mag. Nat. Hist. (7) iv. 
p. 434 (1899). 
19. ONCOCORIS VENTRALIS Walk. North Australia. 
Mormidea 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 facies 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. 
NIARIUS TRYONI, sp. n. 
Ovatus, opacus, niger, subtiliter sat dense punctulatus, supra 
callulis minutis flavidis conspersus, vitta swperiore posteriore 
et margine angusto laterali capitis, basi hujus subtus, basi 
articuli primi, tertii quartique antennarum, rostro (articulo 
ultimo excepto), limbo laterali prothoracis et partis basalis 
corti, epipleuris, macula prope angulos basales et «pice 
seutelli, macula oblonga laterali intus rotundata segmentorum 
abdominalium, acetabulis pedibusque (annulo anteapicalt 
femorum excepto) flavo-ochraceis, ventre medio impunctato, 
dilute piceo, nitido. Articulus primus antennarum apicem 
capitis haud attingens, secundus duobus wultimis wiitis 
equilongus, tertius et quartus subeque longi.  Pronotwm 
lateribus leviter sinwatum.  Scutellum apice impunctatum. 
Hemelytra apicem abdominis attingentia, corio basin segmenti 
sextt connexivt superante. Segmentwum genitale maris medio 
segmentis tribus precedentibus unitis subeequilongum. (Pedes 
postici desunt.) 
Long. 5 10 mm. 
Queensland. 
Allied to WV. dluminatus Dist., but in Distant’s species the 
