8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 70 



2. Elytra dark blue with no trace of yellow (19) indigoptera. 



Elytra yellow with or without markings 3. 



3. Elytra entirely yellow. Oblong, shining, almost impunctate, darker red- 



dish yellow beneath (22) flavida. 



Elytra yellow with dark markings 4. 



4. Elytra with dark spots. Pale yellow, shining, nearly smooth, each elytron 



usually with five or six piceous spots (29) nigrosignata. 



Elytra not spotted 5. 



5. Elytra oval with large piceous sutural area of variable size, leaving margins 



and apex more or less broadly yellow (20) thyamoides. 



Elytra narrowly oval with entire piceous sutural vitta reaching apex, fre- 

 quently a median vitta in each elytron, often disappearing in part or 

 united with sutural vitta (21) texana. 



6. Broadly oval, sides of elytra arcuate 7. 



More elongate, sides of elytra essentially parallel 10. 



7. Elytra margin very narrow, not reflexed ; punctation on elytra very light ; 



yellow brown, elytra piceous with very naiTow pale yellow-brown 



margin and pale apex (23) saltatra. 



Elytral margin broad, often slightly reflexed; punctation on elytra moder- 

 ately coarse 8. 



8. Elytra entirely black or sometimes with dark ferruginous margin, head 



and pronotum reddish brown, never with dark occipital spot. 



(24) quercata. 



Elytra always with yellow-brown margin, head and pronotum yellow brown, 



frequently with dark occipital spot 9. 



9. Yellow brown with distinct broad piceous lateral vitta and short vitta in 



middle at base of each elytron (25) pervittata. 



Yellow brown with light brown to piceous elytra, margins always pale. 



(26) subvittata var. 

 Yellow brown with indistinct vittate markings on elytra varying from pale 



brown to nearly piceous (26) subvittata. 



10. Head coarsely punctate 11. 



Head faintly punctate, nearly smooth 12. 



11. Head, pronotum, and elytra coarsely and deeply punctate ; yellow brown 



with dark blotches on pronotum and upper half of elytra, and broad, 

 zigzag fascia across lower half of elytra ; lateral fold from intrahumeral 

 depression extending nearly to apex, parallel to margin. 



(27) sexmaculata. 

 Head and elytra not so coarsely punctate, pronotum smooth ; pale yellow 

 with reddish head and reddish sutural vitta extending three-fourths the 

 length of the elytra, spreading across base of elytra to cover humeri, 

 frequently a spot in middle and at ajDex of each elytron, sometimes uniting 

 with sutural vitta to form fascia ; no lateral fold (28) suturalis. 



12. Elytra narrovply oblong-oval, humeral prominences small, no marked cal- 



losity at scutellar angle ^^ 13. 



Elytra oblong-oval, humeral prominences distinct, a well-marked sulcus 

 within and a more or less well-marked callosity at scutellar angle 14. 



13. Shining, smooth, pale yellow, with no dark markings on head ; each elytron 



with five or six spots, no sutural vitta, no basal margin across elytra. 



(29) nigrosignata. 



Feebly shining, elytra distinctly punctate, pale yellow, head with piceous 



spot, sutural vitta not entire, each elytron with five or six spots and a 



narrow margin across base (30) spilonota. 



