324 COLEOPTERA OP NORTH AMERICA. 



Thorax distinctly angulate, usually acutely tuberculate, or with a short 

 spine behind the middle ; mesosternum triangular or narrow. 

 Antenna? without traces of cilise beneath, first joint of hind tarsus as 

 long as the next two ; 

 Presternum narrow but not linear, body without erect hairs. Liopus. 

 Prosternum linear, form cylindrical, elytra with erect hairs. Dectes. 

 Antennae distinctly ciliate beneath ; 



Hind tarsi short, first joint not as long as 2-3 ; antenna? % very long, 



the fourth joint longer than the entire body. Mecotetartus. 



"Hind tarsi slender, first joint as long as the next three; antenna? 



normal ; pro- and mesosternum very narrow ; 

 Elytra without lateral carina. Lepturges. 



Elytra with distinct lateral carina. Hyp«rplatys. 



Group III. — Acanthocini. 



There is no character separating this group from the Liopi 

 excei)t the presence of an ovipositor in the female. 

 The genera may be known as follows : — 



Body above with erect hairs beside the pubescence ; 



Mesosternum broad ; antenna? not much longer than the body and not 



ciliate beneath except feebly on the scape. Urographis. 



Mesosternum narrow ; antennae twice as long as the body and very 



slender, ciliate beneath. Graphisurus. 



Body above without erect hairs ; 



Mesosternum moderate ; antennae very long, joints 3-4 at least, densely 

 fringed beneath with short hairs. Acanthocinus. 



The first two genera belong to the Atlantic region, the last has 

 representation on both sides of the continent. 



Urographis ia represented by two species in the Atlantic 

 region; Graphisurus by one; and Acanthocinus tty four, two in 

 the Atlantic and two in the Pacific region. 



Our species of Acanthocinus lead insensibly to Entr3''panus ; 

 the two species of the Western slope, A. obliquus and spectabilis 

 have the sides of the elytra suddenly compressed and declivous, 

 with a distinct carina running from the humeri obliquely back- 

 wards; the same thing is observed in a less degree in A. ??orfo.s'?/s, 

 but very feel)ly in Lamia ob!<olf'ta Oliver, which is incurrcjtly 

 referred by Lacordaire to Graphisurus. 



Tribe IX.— POGOXOCIIERIIVI. 



This tribe, as here defined, contains species of small size, and 

 usually with long erect (flying) hairs, in addition to the ordinary 



