286 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



XANTI group. 



Second joint of antennae equal to one-half the length of the third joint. 

 Form moderately robust, thoracic punctuation fine and sparse. 



Elytra pale castaneous; thorax one-fourth longer than broad xanti Horn. 



Form slender, thoracic sculpture coarse. 



Thorax longer than broad, an te-scutellar impression wanting ; elytra brown 

 with an oblique yellowish fascia at middle reaching the seventh striae, the 

 sixth interval yellowish from the humerus to the fascia. 



obliquefasciala Schaeffer. 

 Thorax nearly twice as long as wide, ante-saitellar impression feeble; elytra 

 testaceous with piceous fasciae, intervals with a single row of fine punc- 

 tures sirpata Horn. 



Form slightly broader, the elytral intervals sparsely, irregularly punc- 

 tate var. spatiosa Wolcott. 



Second joint of antennae equal to two-thirds the length of third joint; thorax finely, 



sparsely punctate, sometimes nearly impunctate. 



Front of head biimpressed ; antennae with joints five to ten subequal in length, 



the outer joints slightly broader. 



Thorax yellow, somewhat infuscate at apex, finely, sparsely, but distinctly 



punctate; elytra parallel, pale yellowish with an irregular maculation or 



incomplete fascia at apical two-fifths fuscous, apex pale; antennae reaching 



basal fourth of elytra tuta Wolcott. 



Thorax reddish brown, slightly infuscate at sides, almost impunctate, the 

 punctures evident at sides and apex, elytra yellowish with markings nearly 

 as in sirpata but tips of elytra black; antennae scarcely longer than head 



and thorax laevicollis Schaeffer. 



Front of head normal; antennae with joints five to ten gradually descreasing in 

 length, equal in width, elytral markings unique peninsularis Schaeffer. 



BICOLOR group. 



Head finely and sparsely punctate. 



Prothorax usually in part reddish yellow, rarely entirely black (the presternum 



anterior to the coxae excepted); elytra black, rarely with an indistinct pale 



median fascia bicolor Say. 



Head rather coarsely and densely punctate. 



Elytra uniformly brown, legs paler, antennae ferruginous inornate Say. 



Elytra piceous with humeral callus and a narrow very indistinct median facia dull 



testaceous, legs bicolored, antennae brownish aemula Wolcott. 



Elytra pale piceous with a median yellow band, the humeri testaceous, the callus 



piceous, legs testaceous, antennae ferruginous fasdfera LeConte. 



HOPE I group. 



Prothorax one-fourth longer than wide; size smaller (9.5-12 5 mm.) 



snowi Wolcott. 

 Prothorax very nearly twice as long as wide at base; size larger (19-23 mm.). 



Elytra with a very broad median band and apex reddish yellow, the apex and 

 band sometimes confluent at lateral and sutural margins, apex of elytra entire. 



hopei Gray. 

 Elytra with a narrow median fascia yellow, aspices piceous. 



Last dorsal with median carina terminating abruptly (female) apices of elytra 

 sinuate in both sexes, sutural angle sometimes prolonged, .californica Horn. 

 Last dorsal with median carina terminating in an elevated posteriorly 

 curving point; apices of elytra rounded (female). Male unknown. 



horni Wolcott. 



