LeContc. 



BAKIXl. 301 



MADARUS Sell. 



In this genus the upper surface is very smooth and shining, and the sur- 

 face of the elytra undulated, but the beak is longer than the prothorax and 

 slender, almost as in Cenfriiius; the antenntt are longer and more slender, 

 the first joint of the funicle as long as the three. following; club elongate 

 oval, annulated, entirely pubescent. The prosternum is extremely wide 

 and gibbous between the coxa?; declivous in front, not excavated, but, with 

 two very short impressions. Front thighs armed with an obtuse tooth, 

 claws approximate, but not connate at base. 



The preceding genus makes a gradual transition from Bm-ix to Madanos, 

 and the arrangement of Lacordairc by which the genera just named are 

 separated in two different subtribes is manifestly unnatural. 



1. M. undulatus Boh., Sch. Cure, iii, 640; Bliynchmnus un-d. Saj', 

 Journ. Ac. Nat. Sc. Phil, iii, 315; ed. Lee. ii, 177. 



Massachusetts to Alabama, Texas, and Kansas. The northern specimens 

 are entirely black; those from the South and West have the j)rothorax red. 

 Although Boheman described all the thighs as toothed, I find that the mid- 

 dle and haul pairs are quite unarmed. The tooth of the front pair is rather 



large, but obtuse. 



Group II. t'eiilrliii. 



The only characters I can give for the recognition of this group, as dis- 

 tinguished from Bari'des, are : the elytra conjointly rounded at tip, or 

 nearly so ; the pygidium thus becomes entirely covered, or only partly 

 exposed, and is nearly horizontal, or at most somewhat oblique, and never 

 vertical. The last ventral is consequently regularly rounded at tip, never 

 truncate or emarginate. In addition to these characters the ventral surface 

 of the abdomen is more convex, frequently ascends obliquely, as in Zygo- ' 

 pini, but in a much less degree. The tibial hooks are less developed than 

 in B(tris and its allies, and in many species are scarcely apparent. The 

 beak and antennae are generally of more slender form than in Baris, but 

 these characters are not without excejitions, as will be seen below. 



A. Body without erect bristles. 



Tibiaj stout, with longitudinal grooves (as in Baris) 2. 



" slender, not grooved 3, 



2. Pectoral groove shallow, indefinite PACHYB ARIS. 



deep, sharply defined STETHOBARIS. 



3. Side margin of prothorax as usual 4. 



well defined MICROCHOLUS. 



4. Third joint of tarsi broad, bilobed 5. 



narrow OALANDRINUS. 



5. Claws separate CENTRINUS. 



" connate at base ZYGOBARIS. 



" sinde BARILEPTON. 



B. Body with stout erect bristles, intermixed with 



the dens ' covering of scales; tarsi narrow. 



Bristles very long EUCH^TES. 



" short PLOOAMUS. 



