146 DR. E. BEKGROTH ox STRIDULATING [May 16, 



4. On Stridulatiug Hemiptera of the Subfamily Hahjinoi, 

 with Descriptions of new Genera and new Species. By 

 Dr. E. Bergkoth, C.M.Z.S., Tammerfors, Finland. 



[Received April 1, 1905.] 



In his paper " Ziir Kenntniss der Stridulationsorgane bei den 

 Rhynchoten," Handlirsch* has described three different kinds of 

 stridulatory oi-gans in the Rhynchota : the prosternal furrow of the 

 Reduviidfe ; the strigose ventral patches of the Division Tetyraria 

 of the Scutelleridse ; aud the, at that time, still incompletely known 

 stridulating apparatus of the Corixida?, of which Kirkaldy t has 

 since given us a complete desci-iption and a probably correct 

 interpretation. There is, however, one group of Rhynchota in 

 which these oi-gans have remained unknown to Handlirsch and 

 all other zoologists, except the distinguished systematist Stal, who 

 knew them without recognising their function. In his important 

 paper " Bidrag till Hemipterernas systematik " J he states that 

 the Pentatomid genera Platycoris, Niarius, A^yhenor, and 6*7^- 

 coco7ns have the following character in common : " segmentis ventris 

 secundo et tertio latera versus vitta longitudinali nonnihil curvata, 

 opaca, vix elevata, transversimdensissime subtilissimeque strigosa, 

 instructis." Although Gilipjnis is described in the same paper, 

 Stal seems to have OA'erlooked 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 tempei-ate parts of America. In a 

 third work I j, finally, he giA^es "A^entre auterius vitta laterali 

 transA'ersim strigosa A'el rugosa instructo " to a groujj of genera 

 comprising Mecidea Dall., Platycoris Guer., Xiarms Stal, Oncocoris 

 Maj'r, Gilipjnis Stal, Alqyhenor Stal, and Caridoplitlial'mus Assm. 

 {Allocotus Mayr, pi'seocc). Mayr^ has also seen these organs in 

 his Oncocoris punctatus^ but simply mentions them as a " schwache 

 Erhohtmg," Avithout having obserA^ed that they are strigose. 

 That they were not quite unknown to Dallas and Walker, will 

 be shoAvn beloAV. Distant ** has lately remoA^ed Mecidea from the 

 Halyinse, placing it together Avith a part of the genus Kiphe Stfd 

 {^Aenaria Dist. nee Stal) in a division which he names Mecidaria, 

 Avithovit mentioning the transA'ersely striolated A^entral patches of 

 Mecidea at all. This is, howeA^er, no systematic imj^roA'ement, 

 these two genera scarcely haAdng anything in common except the 



* Ann. Naturhist. Hofmus. Wien, xv. (1900) pp. 127-141. 



t Entomologist, 1901, p. 9; Journ. Quekett Micr. Club, (2) viii. pp. 33-46 (1901). 



i CEfv. Vet.-Ak. Forh. 1867, pp. 491-560. 



§ Enum. Hem. ii. p. 17 (1872). 



|| Enum. Hem. v. p. 34 (1876). 

 t" Reise d. Novara, Hem. p. 46 (1866). 

 «* Rhynch. Brit. India, i. p. 140 (1902). 



