258 THE ENTOMOLOGIST. 



SYNONYMIC NOTES ON AQUATIC KHYNCHOTA. 

 By G. W. Kikkaldy. 



I AM aware that this paper will not meet with approval from 

 many Ehynchotists, owing to the number of nomenclatural 

 changes it necessitates ; nevertheless, I believe that such changes 

 are, in the end, for the good of science, and that therefore the 

 sooner they are done the better. 



Fam. Hydrometrid^. 



1. Hydrobates, Erichson, 1848, is preoccupied by Boie 

 (Aves, 1822), and also by Vieillot and Temminck (Aves — Cucu- 

 lidffi and Anatidse) ; it will be therefore necessary to employ 

 Cylindrostethus, first characterized by Fieber, Europ. Hem. 33 

 (1861) ; as, however, no species was there assigned to it, one 

 must write CylindrostethiLs, Mayr, that author being the first to 

 adopt a species. 



The synonymy can therefore be thus stated : — 



Cylindrostethus, Mayr, Verb. zb. Ges. Wien xv. 444 (1865), 

 (Fieb. Europ. Hem. 33, 1861). 

 =^ Hydrobates, Erichs. in Schomb. Faun. Brit. Guiana, 614 



(1848) Lnec Boie] . 

 Type. Hydrobates linearis, Erichs., I. c. 614. 



2. The following species of Gerris, mentioned in Stephens's 

 Syst. Catal. Brit. Ins. ii. (1829), are merely list-names, descrip- 

 tions not having been published, viz. aterrima (353), brachyptcryx 

 (352), nana a,nd phceoptera (353), and thoracica (352) [not neces- 

 sarily thoracica, Schummel]. 



In Lethierry and Severin's invaluable Catal. gener., MS. 

 species are not noticed. It would, I think, have been an advan- 

 tage had these been added, as one often has occasion to examine 

 specimens labelled with unfamiliar names, which may be either 

 MS. or belonging to species the descriptions of which one has 

 overlooked. 



3. Fam. Gelastocorid^, nov. nom. for Galgulid.e. 

 Type genus. Gelastocoris, nov. nom. gen. for Galgidus, 

 Latr., 1802, preoccupied by Brisson (Aves), 1760. 

 Type. Naucoris oculata, Fab., 1798. 



4. Fam. Belostomatid.i:. 

 Deinostoma, nom. gen. nov., for Serphns, Stal, 1862, pre- 

 occupied by Schrank, 1780, and Haliday, 1832. It is a pity that 

 Mayr did not adopt a new name in his Monograph (1871) instead 

 of merely indicating that a change was necessary. The type 

 will of course be Belostoma dilatata, Say, and the principal 

 references as follows : — 



