AMERICAN COLEOPTERA. 107 



own observation no coleopterous insect ever has more than two spurs 

 to each tibia except by monstrosity, consequently the above statements 

 are incorrect. 



Tribe III.— Cychrini. 

 Antennse slender, setaceous, four basal joints glabrous (two only in Nomarehin) , 

 inserted under a feeble frontal ridge ; first joint long and often stout, third longer 

 than second. Eyes round moderately prominent, distant beneath from the buccal 

 opening. Head more or less constricted, with one setigerous puncture above the 

 eye, neck often semiglobose. Labrum deeply bifurcate. Mandibles long and 

 prominent, arcuate and acute at tip, and at least bidentate within, and with no 

 setigerous puncture externally. Ligula acute and bisetose at tip, the paraglossse 

 variable. Labial palpi long, the second joint elongate, plurisetose in front, last 

 joint securiform and concave. Maxillae with inner lobe slender, hooked at tip, 

 ciliate or spinous within, the outer lobe stout with the terminal joint longer, the 

 palpi long and slender, the last joint seeuriform and concave. Mentum deeply 

 emarginate without tooth. Thorax variable in form with a lateral and antebasal 

 setigerous puncture. Body not pedunculate, scutellum scarcely evident. Elytra 

 not margined at base, sides rather widely inflexed, margin acute and not inter- 

 rupted. Prosternum usually not prolonged behind the coxse the tip obtuse, the 

 coxal cavities open behind. Mesosternum nearly vertical and obtusely carinate 

 in front. Metasternal epimera not' distinct. Posterior coxae separated by a tri- 

 angular process of the abdomen. Legs long usually slender, the femora usually 

 very feebly clavate. Anterior tibiae very slightly broader to apex, grpoved within 

 near the apex, the spurs terminal but placed slightly obliquely to each other. 

 Tarsi slender, the first joint long, the fourth entire. 



Anterior tarsi usually dilated in the males with a variable number of joints 

 spongy pubescent beneath. 



As above defined the present tribe contains those genera included by 

 Lacordaire excepting Dumaster which Chaudoir has properly removed 

 to the Carabini. Probably misled by the presence of Damaster, Schaum 

 has suggested the union of the present tribe with the Carabini, but the 

 characters separating the two are so well marked and sharply defined that 

 they must be retained as distinct. 



The separation of the posterior coxae which seems to have escaped 

 notice here as well as in several of the following tribes is a character 

 of too great importance to neglect. It is repeated in Metritis^ Prome- 

 cognathus and Enceladus, but there exists too wide an interval between 

 the Cychrini and these genera for us to suggest any special affinity with 

 either of them. With the Carabini the Cychrini appear to have the 

 closest relationship. 



Two genera form this tribe, both represented in the United States. 



Antennae with four basal joints glabrous C'yclirus. 



Antennae with two basal joints glabrous Noiiiarotiis. 



Cychrus as above defined is rather polymorphic and is capable of 



division into parts which rank rather as sub-genera than genera. Those 



