ABT. 23 REVISION OF THE BEETLE GENUS OEDIONYCHIS BLAKE 7 



12. Elytra entirely dark shining blue, purple, or green without trace of yellow. 



(11) gibbitarsa. 

 Elytra dark with yellow margin 13. 



13. Head deeply punctate except on occiput, pronotum often with only one 



median piceous spot, some^^imes thi-ee spots, elytra blue, purple, or green 



with distinct narrow yellow margin (12) flavocyanea. 



Head rather sparsely punctate about eyes, pronotum indistinctly marked 

 with from three to five pale reddish spots, elytra dark blue with yellow 

 margin wider at apex and forming a scalloped pattern (13) lateralis. 



14. Head yellow, sometimes with dark spot on occiput ; pronotum usually seven- 



spotted, .spots frequently united to form a zigzag fascia ; elytra dull 

 blue, green, or purplish with narrow yellow margin along upper half. 



(9) thoracica. 

 Head varying from pale reddish brown to nearly black, sometimes with 

 darker interocular band and dark band on posterior part of occiput, 

 pronotum with five piceous spots, frequently united to form triangular 

 blotch or fascia ; elytra entirely yellowish brown or with a broad, 

 piceous, median vitta on each elytron, nearly covering it (10) fimbriata. 



15. Elytra with two vittae (a broad, piceous, median vitta on each elytron). 



(10) fimbriata. 

 Elytra with more than two vittae 16. 



16. Elytra with five Vittae 17. 



Elytra with three vittae 18. 



17. Yellow brown, pronotum with narrow explanate margin and with piceous 



median spot or band ; elytra with moderately broad, piceous, common 

 sutural vitta occasionally with greenish or purplish luster, and on each 

 elytron a median and submarginal vitta. Middle and Eastern United 



States (15) petaurista. 



Yellow brown, pronotum with moderately broad explanate margin and indis- 

 tinct dark spots; elytra with narrow vittae, frequently having purplish 

 or greenish luster, a common sutural vitta and a median and submarginal 

 vitta on each elytron. Arizona (14) tenuilineata. 



18. Elytra with cianmon sutural vitta and narrow submarginal vitta on each 



elytron ; pronotum with reddish or piceous median blotch. (15) petaurista. 

 Elytra with common sutural vitta and median vitta on each elytron — 19. 



19. Head finely punctate with occiput and front dark, leaving only margin 



about eyes yellow, pronotum two-spotted or with spots confluent, elytra 

 pale yellow with wide sutural and wide median-lateral vitta leaving only 



margin pale, very finely punctate and shining (16) amplivlttata. 



Head usually coarsely punctate, reddish brown 20. 



20. Third antennal joint shorter than fourth. Eastern and Middle States. 



(17) miniata. 



Third and fourth antennal joints about equal, head somewhat smoother on 



occiput. Florida (18) Ti^^ei. 



Elytra with only slight trace of humeral prominences and callosities at 

 scutellar angle, and little trace of depression between. Explanate 



o 



margms narrow ^^ 



Elytra usually with distinct callosity near base of each elytron at scutellar 

 angle, and marked humeral prominences. Margins usually moderately 

 to widely explanate "• 



