AMERICAN COLEOPTERA. 165 



Harpalin^ UNISETOS^. 



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

 numbering only a third and the genera even less proportionately 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 existence of this seta either at 

 or near the hind angle is more of au exception here than its absence is 

 in the Harpalinse bisetosse. 



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

 same proportion as in the preceding section, and it is by this means that 

 we can trace some affinity with Pterostichini on the one side or 

 L 6 b i i n i 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 genera. 



Of the eight tribes which follow six have representation in our fauna, 

 the Apotomini and P e 1 e c i i n i being absent, while Z a c o t i n i 

 is peculiar to it. 



Mesosternal epimera usually wide, sometimes nearly as large as the episterna, 

 elytra truncate. Mandibles with setigerous puncture. Posterior coxse 

 often separated, the first ventral segment risible between them. 



Tribe XL. Brachynini. 

 Mesosternal epimera very narrow and indistinct, elytra always entire. 

 Mandibles with setigerous puncture on the outer side. Abdomen peduncuhite. 

 Thorax not margined at the side, its sutures beneath obliterated. Middle, 

 and posterior tibice emarginate on outer edge at tip. Antennae with two 

 glabrous joints. Posterior coxse separated. Labial and maxilhuv palpi 



elongate ; Tribe XLL Apotomini. 



Thorax margined, sutures distinct. Middle and posterior tibiae not emarginate. 

 Palpi not long. Posterior coxse contiguous or but narrowly separated. 



Tril)e XLII. Broscini. 

 Mandibles without setigerous puncture. 

 Posterior coxse distinctly separated. 



Bod}'^ pedunculate. Elytra not margined at base Tribe XLIII. Zacotini. 



Body not pedunculate. Elytra margined at base Tribe XLIV. Peleciini. 



Posterior coxse contiguous. 



Elytral margin more or less interrupted and witli an internal plica. Antennae 

 with three glabrous joints. 

 Anterior tarsi of male with three, rarely four, joints spongy pubescent 



beneath. Elytral plica feeble Tribe XLV. Chlaeniini. 



Anterior tarsi of male with thi-ee joints dilated and squamulose beneath. 



Elytral plica strong Tribe XLVI. Zabrini. 



Elytral margin not interrupted, no internal plica. Antennse with two, rarely 

 with three, glabrous joints. The male tarsi variable. 



Tribe XLVIL Harpalini. 



(a7) 



