CERAMBYCIDAE. 337 



Sub-tribes are indicated as follows : - 



Scape of antennae clavate. ACANTHODERINI. 



Scape of antennae cylindrical, slender. ACANTHOCININI. 



Sub-Tribe 1. Acaiitlioderiiii. 



The scape of the antennae 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 

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

 in the 9 , 5th broadly emarginate in $ , rounded in 9 . 



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

 of $ broader, and fringed with very long hairs. JEtheopoctines 

 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 Psapharochrus Thomson, but the genera seem to be 

 founded on very feeble characters, and moreover not to be constant 

 even in those differences. 



Sub-Tribe 2. Acanthocinini. 



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 four groups as 

 follows : 



Lateral tubercle of prothorax about the middle. LAGOCHIRI. 



Lateral tubercle behind the middle ; 



Prosternum wider behind the coxae; body flattened above; 



9 without elongated ovipositor. LJOPI. 



9 with long ovipositor. ACANTHOCINI. 



rosternum very narrow, body cylindrical. DECTES. 



Group I. Lagochlrl. 



Represented by the Mexican Lagochirus obsoletus Thorn, 

 which occurs in Lower California ; a large, robust insect, with 

 the disk of the prothorax tuberculate, the lateral tubercles very 



