252 A REVISION OF THE GENUS JOTOXOMUS (FAMILY CARABIDjE: subfamily FER02^INI). By Thomas G. Sloane. JVoto7iomus was founded b}'-Baron de Chaudoir (Bull. Soc. Imp. Nat. Mosc. 1865, ii. p. 83) as a subgenus of Feronia; but in the present paper it is assumed to have full generic value. Strictly speaking it seems to be a subgenus of Pterostichus, as are also C eratofevonia* Sarticus and Rhahdotus; if we regard all these as entitled to full rank as genera, and it is certainly convenient to do so, they may be tabulated as follows : — Mentum with sinus parallel on sides Cera tofornia Mentum with sinus obliquely divergent. Prothorax with border narrow, not forming an explanate border to the lateral basal impressions, these never spreading to lateral border Xotononius. Prothorax with border explanate posteriorly. Lateral basal impressions of prothorax broad, deep, foveiform Sarticiis. Posterior part of prothorax transversely depressed (this depressed part reaching the border laterally) PiJiahdotHS. JVotono7nus may be briefly diagnosed as follows : — Apterous. Mentum with sides of sinus oblique. Prothorax with border narrow and not forming an explanate margin to the lateral basal impressions. Elytra bordered on base, striate ; interstices not costate or carinate, first with an abbreviated stria at base, third punctiferous. Posterior femora not dilatate towards apex, or channelled on lower side. * M. Tschitseherine has recently formed this new subgenus to include Feronia (PterosticJius J rerjalu, Casteln., and P. pJnjhircJius SI.