108 GEO. H. HORN, M. D. 



occurring in our fauna have been the subject of a study by me in which 

 these divisions have been treated in sufficient detail (Trans. Am. Ent. 

 Soc. 1878, pp. 168—185). 



Two important divisions may however be noticed, those in which the 

 anterior tarsi are similar in the sexes and slender, and those with the 

 anterior tarsi dilated in the males. To the first of these series belong 

 the European species and three in our own fauna which occur west 

 of the Rocky Mountains. Those with dilated tarsi are peculiar to our 

 fauna. These two series seem to bear the same relationship to each other 

 that Damaster does to Carabus. 



In Nomaretus and one group of Cychrus (Sphseroderus), the tip of 

 the prosternum is somewhat prolonged and Chaudoir holds the opinion 

 that, from this fact and the more widely dilated tarsi of the male, the 

 group should have generic value. I do not see any necessity for this, 

 for if we attempt to divide Ci/chrus more than two divisions will be 

 required and the subject unnecessarily complicated. 



Tribe IV.— Carabini. 



Antennre slender, with four basal joints glabrous, arising under a feeble frontal 

 ridge. Eyes round moderately prominent and distant beneath from the buccal 

 opening. Head not constricted behind the eyes and with one supra-orbital setiger- 

 ous puncture. Labruiii broad and emarginate. Mandibles stout, arcuate, acute 

 at tip, concave on the outer side and without setigerous puncture. Mentum broad, 

 emarginate, with a variable tooth. Ligula variable, the paraglossse distinct. 

 Maxillse with inner lobe strongly hooked, densely ciliate within, outer lobe 

 stout. Palpi moderate or long, .last joint of both pairs securiform. Thorax with 

 a setigerous puncture at the side and one also near the posterior angle. Body not 

 pedunculate, scutellum small. Elytra feebly embracing the sides of the body, 

 the lateral margin continuous. Prosternum horizontal at tip and prolonged, the 

 anterior coxal cavities open. Mesosternum nearly vertical and subcarinate in 

 front. Metasternal epimera invisible, posterior coxse contiguous. Anterior tibiae 

 gradually broader to tip, slightly grooved within, the spurs terminal but placed 

 obliquely to each other. Femora moderate, the anterior stouter. Middle and 

 posterior tarsi long and slender, the anterior shorter. 



In the males the anterior tarsi are dilated and densely pubescent beneath, the 

 dilated joints variable in number, simple in both sexes in Damaster. 



This tribe is composed of species of at least medium or even of large 

 size, remarkable for the most part for their beauty of form, color and 

 sculpture. As here defined it contains those genera not of the Nebriide 

 type with the addition of Damaster. This latter genus as remarked by 

 Schaum (Ann. Fr. 1862, p. 68), differs from Carabus merely in the 

 absence of dilated tarsi in the male. The entire structure is so closely 

 that of Carabus and so different from Cychrus that it seems almost 

 impossil)le that Lacordaire should have associated it with the latter genus. 



