THE LEAF BEETLES. 



1 L85 



gins and one between these near the suture, the latter set obliquely so as to 

 form with its mate a V; middle of under surface piceous ; antennas and legs 

 dul] yellow. Thorax twice as wide as Ion- margins widely flattened; sur- 

 face alntaceoiis, coarsely and sparsely punctate. Elytra a little wider at 

 base than thorax; disk coarsely, deeply and father closely punctate and 

 with a distinct raised eosta extending from umbone nearly to apex. Length 

 3-4 mm. (Fig. 519.) 



Southern half of State, common ; much less so in the northern 

 counties. May 11-July 6. Taken by beating oak and sifting woody 

 debris. 



0. suturalis Fab. (Figs. 518, a&b), pale yellow with brown spots 

 as shown in figure, length 3.5-4 mm., is a southern form which may 

 occur in the Lower Austral life zone of the State. 

 2189 (6945). CEdionychis quercata Fabr., Syst. Eleut, I, 1801, 495. 



Oval, depressed. Front of head, thorax, legs, epipleurse and narrow 

 margin of elytra yellow ; disk of elytra and under surface piceous. An- 

 tennae longer than half the body, outer joints piceous. Thorax more than 

 twice as wide as long, margin widely flattened, front angles dentiform ; sur- 

 face finely alutaceous, very finely and sparsely punctate. Elytra not wider 

 at base than thorax, umbone distinct, sulcate within; surface finely but 

 distinctly and rather closely punctate. Length 3.5-4 mm. (Fig. 517, c 

 and d.) 



Throughout the State; frequent. April 22-June 18. Occurs on 

 oak, red-haw and other foliage. Mating June 7. The sides of ely- 

 tra are more parallel than in thyamoides and the next. 



Fig. 520. CEdionychis scalaris and its varieties. (After Horn.) 



2190 (6946). GEdionychis scalakis Melsh., Proc. Phil. Acad. Nat. Sci. Ill 

 1847, 163. 



Oval, slightly oblong, depressed. Above dull yellow ; occiput piceous ; 

 thorax with a brown or piceous spot each side, sometimes merged to form 

 a discal space ; elytra with three broad, black, common crossbars, confluent 

 along the suture, these sometimes broken into spots; under surface piceous 

 legs pale. Thorax as in quercata. Elytra not wider at base than thorax' 

 umbone distinct, surface rather coarsely punctate near base, smoother at 

 tip. Length 4.5-5 mm. (Fig. 520.) 



Lake, Marion, Knox, Posey and Dubois counties; scarce. April 

 19-July 9. Occurs on the foliage of plants along marshes. The 

 black of elytra varies much in extent, the spots or crossbars being 

 sometimes so merged as to cover nearly the entire surface. 



