200 Say^s Descriptions of new 



2. A. crenicollis. Yellowish ; thorax five-spotted ; 

 elytra with black vittse. 



Inhabits Mexico. 



antennce 



joints boney-yellow; with a black line above : vertex with 

 a black spot : thorax with two small dots, and an abbre- 

 viated line, arranged triangularly , black, and a lateral, 

 somewhat larger, oblique, oval, indented, black dot : scutel 

 black : elytra irapunctured, destitute of striae ; a common 

 sutural black vitta, another in the middle somewhat nar- 

 rower than the intervening portion, and a submarginal 

 one : pectus yellowish : postpectus and venter black, the 

 latter with yellowish margins to the segments : feet honey- 

 yellow ; tibicB and anterior and intermediate thighs with 



a black line. 



Length one fifth of an inch. 



Very closely allied to the A. aJterndta, lUig-, the form 

 and proportion of the elytral vitta being the same, but 

 that species is somewhat larger, and is altogether destitute 

 of the lateral thoracic impressed dots. 



3- A. ceracoUis. White ; head black, elytra viola- 



ceous. 



Inhabits Mexico. 



Body white, impunctured : head black, with an elevated 

 line below the antennae : antenncz black, second and third 

 joints white, with a black line above : thorax immaculate : 



black. 



>/ 



Length less than one fifth of an inch. 



Resembles the K.coUdris, IHig^j {xanthomelas, Dal- 

 man,) but is much more closely allied to A. coUata^ Fabr. 

 It is somewhat doubtful if it be a distinct species ; but as 

 I possess specimens of the latter from Pennsylvania, Mis- 



