ORDER COLEOPTERA. 231 



synostosized, careened laterally, and embrace a part of the 

 sides of the abdomen. These carabici compose the genus 

 Cychrus of PaykuU and Fabricius, but which has been since 

 modified in the following manner. 



Those whose tarsi are similar in both sexes, whose corslet 

 is in the form of a truncated heart, more narrow behind, or 

 almost orbicular, and not raised on the sides, with the poste- 

 rior angles either obliterated or rounded, have alone preserved 

 the generic denomination of 



Cychrus.* 



Those in which the males have the first three articulations 

 of the anterior tarsi dilated, but feebly so, and palette-formed. 

 The corslet is in the form of a trapezium, broad, emargi- 

 nated at the two ends, raised on the sides, with the posterior 

 angles acute and recurved, compose another generic section, 

 that of 



ScAPHiNOTUs, Lat. Dej. 



Cychrus elevatus, Fab. Knock. Beytr. I. viii. 12., Dej. Spec. 

 XL, p. 17. 



Other species in fine having the appearance of Cychrus, 

 but whose anterior tarsi have, in the males, the first two arti- 

 culations very much dilated, and forming with the following, 

 which is less so, and the figure of which is that of a heart, 

 a palette, are, according to M. Dejean, 



Sph.eroderus. 



The species of these last two sub-genera are peculiar to 

 America. 



* Cychrus Rostratus, Fab. Panz. Faun. Insect. Germ. LXXIV. 5 ; Clairv. 

 Entom. Helv. II. xix. A ; C. attcnuatus. Fab. Panz. ibid. II. 3 ; Clairv, 

 ibid. xix. B. ; C. Italicus, Bon. Observ. Entom. (Mem. de Acad, de Turin.) 

 See for the other species, Spec, de M. le Comte Dejean, II. p. 4, et seq. 



