524 Transactions of the Society. 



Finally, I have settled upon a purely provisional arrangement, 

 u liich seems to permit the grouping into sets of more or less allied 

 species, which may, at least, be of assistance for the purpose of 

 mere identification of species. 



We can begin by eliminating those species in which the meta- 

 stermim is not truncate posteriorly, but produced into a rounded 

 lobe, this group containing Old World forms only; we may con- 

 veniently refer to them as the Titanolabides. The first genus, 

 Spondox Burr (New Caledonia) has the mesosternum truncate, as 

 in most other Psalidse, but in the remaining genera, Homicolabis 

 Bor. (India), Titanolabis Burr (Australia), and Labidurodes Duhr. 

 (Papua), the mesosternum is lobed like the metasternum ; all this 

 group have a long, simple virga. 



We can then conveniently separate the American group of 

 J'stdides, but it is hard to define them as a group ; here the meta- 

 parameres are elongate, more or less dilated near the base, or short 

 and broad, almost rectangular, always attenuate apically, usually 

 acute ; the metasternum is truncate, as in the remaining Psalidse ; 

 probably a simple virga is always present, but I am unable to 

 be positive in cases where I have only had old and dry specimens 

 to examine. In this group we include Heterolabis Bor., for 

 II. braziliensis Bor., a Brazilian apterous species recently de- 

 scribed and figured by Borelli, with a prominent virga ; Psalis 

 Sew., sensu stricto, for the large fully-winged P. americana Beauv., 

 P. gagatina Burm. (which includes the " Carcinophera robusta " of 

 de Bormans, Zacher, Scudder, and other authors), for a new genus 

 which I erect here for Anisolabis peruviana Bor., under the name 

 3Ianctex, and another new genus for the smaller, fully-winged, 

 brightly-coloured species of Psalis, of which P. pulcltra Eehn is 

 the type ; P. hsenschi Burr falls here, and perhaps P. f estiva Burr, 

 P. nigra Caud., and P. rosenbergi Burr. This genus I call Spandc:> . 

 And, finally, it is necessary to make a new genus for Ev.labis 

 saramaccensis Zacher, since his genus Eulabis is to be restricted to 

 certain Old World forms, as we shall see later. This new genus I 

 call Metalabis. 



We are now face to face with the problem of sorting out the 

 numerous homogeneous species inhabiting various parts of the 

 Old World, which have hitherto been collected together in Ani- 

 solabis Fieb., Euborellia Burr, Gonolabis Burr. 



We must, I think, first divest ourselves of the idea that the 

 features upon which those genera are based have any great value ; 

 Euborellia, with its rudimentary elytra, Gonolabis, with its poste- 

 riorly dilated abdomen, cannot stand as such, since, it seems to 

 me, that these are features which are most probably due to con- 

 vergence. For instance, Mandex peruviana Borrn., from Peru, with 

 its great size, restricted habitat, and knife-like metaparameres, is 

 not to be ranged in the same genus with the little Oriental Eubo- 



