NEW SPECIES OB' CARABIDEOUS INSECTS. 355 



illustration of Mr. Gray's genus Cnemacanthus, whilst in the 

 same work will be found a true species of Cnemacanthus de- 

 scribed and figured under the name Promecoderus Lottini. ' 



M. Guerin-Meneville, in the ' Magasin de Zoologie,' * also 

 figures and describes certain species of Odontoscelis under 

 the name of Cnemacanthus, but this author perceives that the 

 species of Cnemacanthus of the French authors differ in cer- 

 tain respects from the type of the genus figured in Griffiths' 

 'Animal Kingdom,' inasmuch as they have the anterior tihicB 

 prolonged externally ; he states however that a small species 

 which is found in Peru has not this external prolongation of 

 the tihia, " et vient par consequent se ranger exactement a 

 cote du type de M. Gray. Nous ne pensons pas que cette 

 legere difference soit suffisante pour motiver I'etablissement 

 d'un nouveau genre ; nous nous en servirons pour diviser les 

 Cnemacanthes en deux sections, ainsi qu'il suit." The au- 

 thor then proposes to distinguish those species which have 

 the anterior tibiae produced externally, by the name of Cne- 

 malohus, retaining Cnemacanthus for Mr. Gray's species, and 

 one other which he names Cnem. parallelus. 



Now to those who are engaged in the study of the geogra- 

 phical distribution of species, it is most important to know 

 what genera there are, species of which are found both in 

 Australia and South America ; it is highly desirable therefore 

 that the difference in the structure of the anterior tibicd of 

 Cnemacanthus ipropei and Odontoscelis should be attended to, 

 and that the Cnemacanthus parallelus be submitted to fur- 

 ther examination, for Mr. Gray's genus does not differ otili/ 

 from Odontoscelis in not having the tibia produced externally 

 — there are other very important differences — one of them 

 indeed has been considered so important by Dejean,^ that he 

 established two great groups which are distinguishable by it, 

 and alluded to the tarsi of the intermediate pair of legs being 

 dilated in the male sex, as well as the anterior pair ; such is 

 the case in Cnemacanthus proper, whereas in Odontoscelis 

 only the anterior pair are dilated in the males : again, in 

 Cnemacanthus the tooth in the notch of the mentum is short, 

 broad, and truncated, whilst in Odontoscelis it is long and 

 pointed. 



* Id. page 450, plate 18, fig. 4. 

 2 Annee 1838, liv. 2, pp. 9—13, plates 226 and 227. 

 3 This author places his genus Promecoderus (which, as hefore stated, is 

 synonymous with Cnemacanthus of Gray) in his section ' Harpaliens.^ 



Vol. IV.— No. 34. n. s. 2 x 



