146 DR. E. BERGROTH ON STRIDULATING [May 16, 
4. On Stridulating Hemiptera of the Subfamily Halyine, 
with Descriptions of new Genera and new Species. By 
Dr. E. Bercrory, C.M.Z.8., 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 
Reduviide ; thestrigose ventral patches of the Division Tetyraria 
of the Scutelleride ; and the, at that time, still incompletely known 
stridulating apparatus of the Corixide, of which Kirkaldy? 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 Stal, who 
knew them without recognising their function. In his important 
paper “ Bidrag till Hemipterernas systematik” { he states that 
the Pentatomid genera Platycoris, Viarius, Alphenor, and On- 
cocoris have the following character in common: “‘segmentis ventris 
secundo et tertio latera versus vitta longitudinali nonnihil curvata, 
opaca, vix elevata, transversim densissime subtilissimeque strigosa, 
instructis.” Although Gilippus is described in the same paper, 
Stil 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 ||, finally, he gives “‘ventre anterius vitta laterali 
transversim strigosa vel rugosa instructo” to a group of genera 
comprising Jecidea Dall., Platycoris Guér., Niarius Stal, Oncocoris 
Mayr, Gilippus Stal, Alphenor Stal, and Caridophthalmus Assm. 
(Allocotus Mayr, preoce.). Mayr has also seen these organs in 
his Oncocoris punctatus, but simply mentions them as a “ schwache 
Erhéhung,” 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 J/ectdea from the 
Halyine, placing it together with a part of the genus Viphe Stal 
(Aenaria Dist. nec Stil) 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. Naturhist. Hofmus. Wien, xv. (1900) pp. 127-141. 
+ Entomologist, 1901, p. 9; Journ. Quekett Micr. Club, (2) viii. pp. 33-46 (1901). 
{ @tv. Vet.-Ak. Forh. 1867, pp. 491-560. 
§ Enum. Hem. ii. p. 17 (1872). 
|| Enum. Hem. v. p. 34 (1876). 
@ Reise d. Novara, Hem. p. 46 (1866). 
«* Rhynch. Brit. India, i. p. 140 (1902). 
