322 COLEOPTERA OF NORTH AMERICA. 



Sub-tribes are indicated as follows :— 



Scape of antennae clavate. Acanthoderini. 



Scape of antennae nearly cylindrical, slender. Acanthocinini. 



Sub-Tribe 1. — Acaiitlioderini. 



The scope of the antenna; is gradually thickened towards the 

 tip, and shorter than the 3d joint, without apical cicatrix. The 

 prothorax is armed with dorsal tubercles, and the lateral spine is 

 large, acute, and situated about the middle; 1st joint of hind 

 larsi not much longer than the 2d; ventral segments 2-4 shorter 

 in the 9, 5th broadly eniarginate in 'h , rounded in 9. 



We refer all our species to Acanthoderes, having the front tarsi 

 of % broader, and fringed with very long hairs, ^theopoctines 

 Thomson, founded upon A. Morrisii Uhler, does not seem to be 

 sufficiently distinct; the lower lobe of the eyes is smaller, oblique 

 and oval, rather than quadrate. 



In A. quadrigibbus the eyes are less coarsely granulated than 

 in the others; it and A. decipiens Hald. are referred by Lacor- 

 daire to Psapharochrns Thoim^on, but the genera seem to be 

 founded on very feeVjle characters, and moreover not to be con- 

 stant even in those differences. 



Sub-Tribe 2. — Acaiitliociiiini. 



The scape of the antennae is elongate and slender, scarcely 

 thickened at tip, without apical cicatrix. The prothorax is either 

 tuberculate on the disk, or not ; the lateral spine is sometimes 

 placed at the middle, sometimes behind the middle, sometimes 

 'even very near the base. The genera indicate three groups as 

 follows : — 



Lateral tubercle of thorax at the middle ; tarsi broad, Lagochiri. 



Lateral tubercle beliind the middle; tai'si slender, except in Mecotetnrtvs : 



Females without elongated ovipositor. Lion. 



Females with elongated ovipositor. Acanthocini. 



Group L — Lagochiri. 



In this group the lateral tubercle of the thorax is at the middle; 

 the females without ovipositor. The pro- and mesosternum are 

 moderately broad, the former channelled, the latter truncate at 

 tip. The tarsi on all the feet are broad, the first joint of hind 



