156 AMERICAN (;OLEOPTERA. 



Front concave, or with a deep fossa adjacent to tlie eyes; two basal joints 



of antennsB pale 75. eavi Irons. 



Front flat, without juxta-ociilar excavation. 



Protliora.>f widest at the base ; first two joints and club of antejinse paler. 



76. ll II roil. 

 Prothorax widest before tlie base ; first joint of antennae pale 2. 



2. Beak nearly straiglit in basal three-fourths 77. varicoriie. 



Beak rather strongly, evenly arcuate. 



Vestiture squamiforra, condensed on alternate intervals of the elytra; first 

 joint of antennae ( 9) scarcely longer than the two following. 



78. alteruatiiin. 



Vestiture hairy, uniform; first joint of antennse (9) fully as long as the 

 three following 79. coiitiisuill. 



3. Thorax liroadest in front of base; beak parallel, in part yellow in the % . 



80. iiasiitiiiil. 

 Thorax broadest at base; beak tapering, not differently colored in the sexes. 

 Beak more slender, as long as the head and prothorax {%); punctuation 



beneath coarse and dense 81. N<'giii|>es. 



Beak stouter, shorter than the head and prothorax { % ) ; i)unctuation' 

 beneath sparser and finer 82. arizonse. 



4. First joint of middle or hind tarsi of % with a spiniform process on the 



inner side 6. 



Tarsi of % not spined. 



Vestiture squaniiform 83. f'lilllilarse. 



Vestiture hairy, at least on the elytra. 

 Front narrower than the tip of the beak. 



Form very narrow 84. fililin. 



Form robust or veutricose. 



Pubescence sparse, uniform 8,5. veiitricosuin. 



Pubescence of the elytra conspicuously condensed at the base, especi- 

 ally on the third interval 86. Mubornatiim. 



Front never narrower, usually obviously wider than the tip of the beak. .5. 



5. Prothorax subconical ; sides nearly straight; beak strongly dilated near 



the base. 



Legs pale 87. dilatatiiin. 



Legs black 88. cras!suin. 



Prothorax with more or less well-marked apical constriction ; base not or very 

 little wider than the middle. 

 Legs thin, more or less pale ; beak short, stout. 



Thorax stouter, beak longer; pubescence well marked. 



89. ileeoloratiini. 

 Thorax smaller, deeply constricted behind the apex; beak very short; 



pubescence inconspicuous 90. eniaciipes. 



Legs dark. 



Thorax arcuate at middle ; tibiaj and tarsi indistinctly paler. 



91. elutipes. 

 Thorax parallel in basal half; legs entirely black. 



Elytral interval strongly convex; beak longer, tapering. 



92. cariiiatiiiii. 



