CERAMBYCID/E 231 



ventral feebly sinuate medially at apex. Length (c?) 33.0, (9) 

 39.0 mm.; width (cf) 10.0, (9) 14-5 mm. Indiana, Levette. 



amplians n. sp. 



3 Form more nearly as in the female of amplians, the elytra dilated, 

 somewhat inflated and widest behind the middle, where they are 

 two-thirds wider than the prothorax, scarcely twice as long as wide; 

 prothorax narrower and less transverse than in brunnea, slightly 

 more than twice as wide as long; head small, the eyes separated by 

 three-fifths their width; antennae sensibly tapering, relatively longer 

 than in either of the preceding, extending fully to the middle of the 

 elytra, the surface of the body more shining and less densely punc- 

 tured. Male unknown. Length (9) 34.0 mm.; width n.8 mm. 

 Long Island (Willets Point) spadix n. sp. 



The exact taxonomic relationship of these forms can only be deter- 

 mined by comparing large series, but they now seem to be specifically 

 distinct. The numerous synonyms belong wholly to the very 

 elongate and rectilinear form, described above as brunnea. 



Tragosoma spiculum Csy., which is given as a synonym in the 

 Henshaw list, is a species so distinct from any other that it could 

 not fail to be instantly recognized; it does not resemble harrisi in 

 any way, except in the general characters of the genus. 



Tribe PRIONINI. 



Our American genera of the tribe Prionini, as defined by LeConte, 

 may be distinguished as follows: 



Antennae having the outer joints sculptured with a longitudinal reticu- 

 lation of anastomosing raised lines, stout and imbricate (cf) or 

 slender (9); sides of the prothorax with two acute teeth and an 

 acutely prominent to obtuse or rounded basal angle. [Type P. 

 coriarius Linn.] Prionus 



Antennae having the surface of the outer joints even and not reticulate 

 with raised lines 2 



2 Sides of the prothorax as in Prionus; antennae (c?) with the joints 

 not sinuate beneath at their apices, 12-jointed; posterior tarsi dis- 

 tinctly shorter and broader than in Prionus and more scantily 

 clothed beneath. [Type Prionus palparis Say] Prionina 



Sides of the prothorax rounded, without trace of teeth, except occasion- 

 ally a small median denticle; antennae (cf ) formed as in Prionus, 

 the joints deeply sinuate beneath at their apices or strongly bilobed, 

 closely imbricate, 13- to 14-jointed; posterior tarsi as in Prionus 

 but less padded beneath and with more evident long hairs inter- 

 mingled. [Type Prionus emarginatus Say] Homaesthesis 



Prionus is very widely distributed but the last two genera seem 

 to be confined to the Rocky Mountain districts. 



