296 INSECTA. 



joints are much wider, and in this case the succeeding one is always 

 smaller than its antecedent; sometimes the latter and the two pre- 

 ceding ones are larger, almost equal, and in the form of a reversed 

 heart or triangular: the first joints of the four following tarsi are 

 more slender and elongated, almost cylindrical, or in the form of an 

 elongated and reversed cone. 



In some, the hooks of the tarsi are simple or not dentated. 



Here the third joint of the antennas is, at most, double the length 

 of the preceding one. The feet are generally robust, the thighs 

 thick and more or less oval; the thorax measured in its greatest 

 transversal diameter is as wide as the elytra. 



Sometimes the mandibles are evidently shorter than the head, not 

 projecting beyond the labrum at most more than half their length. 



We will begin with those in which the exterior palpi are 

 filiform. 



Zabrus, Clairv. Bon. Pelor, Bon. 



Distinguished from the following by the last joint of the maxillary 

 palpi, which is evidently shorter than the preceding one, and by the 

 two spines which terminate the two anterior tibise(l). 



Pogonus, Zieg. Dej. 



The Pogoni, which in a natural order appear to us to be closely al- 

 lied to the Amarx of Bonelli, are removed from the other Carabici of 

 this division by the mode of dilatation peculiar to the two anterior 

 tarsi of the males; the two first joints, of which the radical is the 

 largest, are alone dilated; the two following ones are small and 

 equal. Their body is usually more oblong than that of an Amara, 



separated this insect from the Feroniie, and formed the genus Camptoscelis. The 

 last joint of the exterior palpi being 1 strongly securiform in Myas, that genus 

 should also be distinguished from the Feronise. 



Count Dejean has observed that in the genus Pelor, of ttonelli, the tooth of the 

 middle of the emargination of the mentum is bifid, while it is entire in Zabrus. 

 He retains, as we have already stated, his genus Amara, but if the characters as- 

 signed to it be compared with those of the Feronia, the slightness of this generic 

 distinction will soon be perceived. The last joint of the palpi of the Amarae is 

 slightly oval; it is cylindrical or slightly securiform in the Feronix. His genus 

 Tetragonoderus differs but very little from that of Amara. The tooth in the mid- 

 dle of the emargination of the mentum is truncated and entire, or without a fissure. 



(1) Carabus gibbus, Fab.; Labrus gibbus, Clairv., Entom. Helv., II, xi. For the 

 other species see Catalogue, &c. of Dejean, and the third volume of his Species, 

 Gener., &c. The apterous species, such as the Slaps spinipes, Fab.; Panz. Faun. 

 Insect. German., XCVI, 2, form the genus Pelor. 



