AMERICAN COLEOPTERA. 109 



I entirely agree with Chaudoir (Bull. Mosc. 1861, p. 502), in placing 



Damaster in the present tribe. 



Within our faunal limits but two genera occur separated by the form 



of the third antennal joint. 



Third joint of antennae cylindrical '. CarabilS. 



Third joint of antennse compressed Calosoma. 



In their numbers of species these genera in our fauna reverse that of 

 Europe where Carabua is far more numerous than Calosoma, with us 

 the latter genus has the greater number of species but the disparity 

 between the genera is not so great as in Europe. 



Tribe V. — Pamborini. 



Antennse straight, moderate in length, arising under a distinct frontal margin ; 

 first four joints glabrous, first joint slightly elongate, third longer than second. 

 Eyes not large, moderately prominent, distant from the buccal fissure. Head 

 narrowed behind the eyes to a distinct neck and with a single setigerous puncture 

 over each eye. Labrum transverse, deeply but broadly emarginate. Mandibles 

 arcuate, acute at tip, strongly dentate within, without setigerous puncture. Mentum 

 short, broad, narrowed in front, broadly but feebly emarginate, epilobes narrow 

 but distinct, mental suture distinct. (Ligula and maxillse not dissected.) Labial 

 palpi robust, the terminal joint longer, elongate securiform, second joint without 

 setse. Maxillary palpi similar but with the second joint longer than the fourth. 

 Thorax somewhat narrowed behind the hind angles slightly prolonged, a setigerous 

 puncture at middle of sides another near the hind angle. Body not pedunculate, 

 scutellum short and broad. Elytra not margined at base, lateral margin entire, 

 sides moderately inflexed. Prosternum horizontal and prolonged at tip, anterior 

 coxal cavities open behind. Mesosternum nearly vertical obtusely carinate in 

 front. Metasternal epimera indistinct, posterior coxEe contiguous. Femora moder- 

 ate, the anterior slightly stouter. Anterior tibise broader to tip, the outer apical 

 angle prolonged, deeply grooved on the inner side, the inner spur situated con- 

 siderably above the outer. Tarsi slender, the first joint equal to the next three 

 together, fourth joint slender. 



Anterior tarsi slender and similar in both sexes. 



This tribe contains but one genus peculiar to Australia, Pamborus. 

 Lacordaire has associated JVj^ns with it, but by what process of reason- 

 ing I have been unable to determine and which has been very properly 

 separated by Chaudoir and associated with Fanagseus. By the open 

 anterior coxal cavities, the form of the mesosternum and the contiguous 

 posterior coxae, Pamborus exhibits a decided relationship with the 

 Carabini, but the structure of the anterior tibiae and the more widely 

 inflexed elytra are abundantly sufficient to separate it as a distinct tribe. 

 By the latter character a relationship is exhibited with the Cychrini and 

 by the anterior tibiae with Scaritini. It might also be observed that the 

 structure of the head above resembles Peleciuvi but beyond the resem- 

 blance there is no further affinity. 



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