46 COLEOPTERA OF NORTH AMERICA. 



broad, deeply emarginate witliin, spurs moderate in length. Tarsi 

 moderate in leiigtli, usually ciliate above, the fourth joint either 

 entire, emarginate, or even bilobed. Claws simple. 



The anterior tarsi of the male are rarely broader than the 

 female. 



The form of the ligula has been almost the entire reliance in 

 the separation of this tribe from the other Truncatipennes, but 

 the method usually adopted in describing the ligula as having no 

 paraglo'ssa? is entirely erroneous. 



One genus, Helluomorpha, alone is represented in the Atlantic 

 region by six species. The labrum is large, concealing the 

 mandibles, and the antenna3 are strongly flattened. The species 

 are elongate, hairy, coarsely punctured, brown insects, found 

 under stones and bark. 



HaRPALTNJS UNTSETOSiE. 



This section is not by any means as large as the preceding, the 

 tribes numbering only a third, and the genera even less propor- 

 tionately numerous. The essential character of this section is 

 the presence of but one supra-orbital seta. This carries with it 

 the tendency to a loss of the seta at the hind angle of the thorax, 

 in fact the presence of this sieta, either at or near the hind angle, 

 is more of an exception here than its absence in the Rarpalinae. 

 hiselonee. 



The elytral plica exists in some of the tribes here, and in about 

 the same proportion as in the preceding section, aiwl it is by this 

 means that we can trace some affinity with Pterostichini on the 

 one side or Lebiini on the other. 



The setigerous puncture on the outer side of the mandible is 

 also observed here in a relatively greater number of tribes, but in 

 far fewer genei'a. 



Mesostenial epimera usually wide, sometimes nearly as wide as the epis- 

 terna, elytra truncate. Mandibles with setigerous puncture. Posterior 

 coxae often separated, the first ventral segment visible between them. 



XXVIII. Brachynini. 

 Mesosternal epimera very narrow and indistinct, elytra always entire. 

 Mandibles with setigerous puncture on the outer side. Abdomen pedun- 

 culate. Posterior coxse contiguous or but narrowly separated. 



XXIX. Broscini. 

 Mandibles without setigerous puncture. 

 Posterior coxs distinctly separated. 



Body pedunculate. Elytra not margined at base. XXX. Zacotini. • 



