OF AMERICA NORTH OF MEXICO. 



141 



much more transverse form, and is usually very much bent upwards ; both of these 

 characters tend more distinctly to localise the region of the mouth, and to confine its 

 organs to their own proper cavity. 



In the second series with soldered elytra and indistinct humeri, we find both 

 round and angulated acetabula, thus indicating an intermediate position. We also 

 observe in some genera a character which does not appear in any other Lamise 

 except the embryonic Dectes already noticed ; it is the emargination of the tip of the 

 mandibles. Finally, we have in the male of one genus, {Ipochus,) a head constricted 

 behind the eyes, and completely exserted from the globular thorax. This is not 

 known to occur in any other Lamia. 



These facts prove the aberrant nature of this series, although there is nothing to 

 indicate its position as a series higher or lower than the two already characterized. 

 It certainly has no highly organized form, indicating any culminating point, such as 

 exist in the other series, and I regard it simply as a recurrent branch connecting the 

 Lamiae with the Cerambyci ; of the latter we have had already one genus Michthysoma, 

 showing strong Lamioid tendencies on the one hand, and connected with Clytus on 

 the other, and from that genus the transition to Dorcadion is very easy and natural. 

 It must not be forgotten that Clytus, too, resembles the present division, in having 

 the front large and perpendicular. 



The relation of the groups into which I have divided the Lamiae may be expressed 

 by the following table : 



*Acetabula antica valde hientia, extus angulata. 

 Mandibulse integrae, ..... 



Mandibulae apice emarginatse, .... 



** Acetabula antica integra. 

 A. Humeri distincti ; acetabula antica extus angulata 

 ' approximatge, articulo l"""- cylindrico; pedes breves, 

 approximatfe, articulo l"""- clavato, pedes longi, 

 subapproximatse, acetabula antica postice paulo imperfecta, 



impressa; tibiae anticse simplices, .... 

 impressa ; tibiae anticae apice unco armatae, 

 'brevis convexa; pedes postici approximati, 

 brevis convexa; pedes postici distantes, 



o B f tarsi articulo ultimo brevi ; thorax cylindricus, 

 S I > I 



'tl J "B ^' *^^^^ *^*'- ^^- loiig° ; antennae art. 1™°- subclavato, 

 ^ [_tarsi art. ult. longo; antennae art. l'""- longissimo, 



S8 



B 



a 



.| 1^ valde clavata, 

 ^valde elongati ; thorax spina articulata armatus, .... 



B. Humeri nulli ; acetabula antica vel rotundata vel angulata, 



C. Humeri distincti ; acetabula antica rotundata. 

 Antennae articulo l"™" elongato, cylindrico ; frons brevis, 

 Antennae articulo 1""" clavato; frons magna, 



36 



I. 

 II. 



III. 



IV. 



V. 



VI. 



vn. 



VIII. 

 IX. 



X. 



XI. 

 XII. 



XIII. 



XIV. 



XV. 



XVI. 

 XVII. 



