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Show 146 DR. E. BERGROTH ON STRIDULATING [May 16, 4. On Stridulating Hemiptera of the Subfamily H a l y i n c e , with Descriptions of new Genera and new Species. By Dr. E. B e r g r o t h , C.M.Z.S., Tammerfors, Finland. [Received April 1, 1905.] In his paper " Zur Kenntniss der Stridulationsorgane bei den Rhynchoten," Handlirsch * has described three different kinds of stridulatory organs in the Rhynchota : the prosternal furrow of the Reduviidse ; the strigose ventral patches of the Division Tetyraria of the Scutelleridse ; and the, at that time, still incompletely known stridulating apparatus of the Corixidse, of which Kirkaldy f has since given us a complete description and a probably correct interpretation. There is, however, one group of Rhynchota in which these organs have remained unknown to Handlirsch and all other zoologists, except the distinguished systematist StSl, who knew them without recognising their function. In his important paper " Bidrag till Hemipterernas systematik " J he states that the Pentatomid genera Platycoris, Niarius, Alphenor, and On-cocoris have the following character in common: " segmentis ventris secundo et tertio latera versus vitta longitudinalinonnihilcurvata, opaca, vix elevata, transversimdensissime subtilissimeque strigosa, instructis." Although Gilippus is described in the same paper, Stll seems to have overlooked the fact that this genus possesses the same structure, and in the systematic arrangement he places Oncocoris far apart from the other genera above mentioned. In a subsequent memoir § he ascribes the same character to Mecidea, the species of which are mostly African, though it is also represented in India and the temperate parts of America. In a third work|j, finally, he gives " ventre anterius vitta laterali transversim strigosa vel rugosa instructo " to a group of genera comprising Mecidea Dali., Platycoris Guer., Xiarms StSl. Oncocoris Mayr, Gilippus StSl, Alphenor StSl, and Caridophthahnus Assm. (.Allocotus Mayr, prteocc.). Mayr^f has also seen these organs in his Oncocoris punctatus, but simply mentions them as a " schwache Erhohung," without having observed that they are strigose. That they were not quite unknown to Dallas and Walker, will be shown below. Distant ** has lately removed Mecidea from the Halyinae, placing it together with a part of the genus Niphe StSl (Aenaria Dist. nec StSl) in a division which he names Mecidaria, without mentioning the transversely striolated ventral patches of Mecidea at all. This is, however, no systematic improvement, these two genera scarcely having anything in common except the * Ann. Naturliist. Hofmus. Wien, xv. (1900) pp. 127-141. f Entomologist, 1901, p. 9 ; Journ. Quekett Micr. Club, (2) viii. pp. 33-46 (1901). i (Efv. Vet.-Ak. Forh. 1867, pp. 491-560. § Enum. Hem. ii. p. 17 (1872). I! Enum. Hem. v. p. 34 (1876). f" Reise d. Novara, Hem. p. 46 (1866). |