1108 



FA MILT LITI. CHE YSOMEL1DJE . 



KEY TO INDIANA GENERA OF SAG EI N I. 



a. Thorax somewhat bell-shaped, the sides much rounded, without teeth 

 or tubercle ; front coxa? not prominent, separated. III. Oesodacna. 

 aa. Thorax with a tubercle or angulate at the sides ; front coxae prominent, 

 contiguous. 



6. Eyes emarginate; thorax with a large, distinct tubercle on sides; 



front coxal cavities closed ; claws toothed. IV. Zeugophoea. 



66. Eyes entire; thorax angulate or toothed at sides; front coxal cavi- 

 ties open ; claws cleft. V. Syneta. 



III. Oesodacna Lat. 1802. (G-r., ''bud + gnawer.") 



This genus, as characterized above, contains a single species of 

 such variability in color, that it has been described under six or 

 seven different names. It occurs on willow blossoms in the spring, 

 several color varieties often being found on the same tree. All in- 

 tergrades are known, from those entirely piceous to those almost 

 wholly pale brownish-yellow. 



2041 (6550). Oesodacna atea Ahrens, Nov. Act. Halens, 

 I, 1810, 46. 



Elongate, rather slender, subconvex. Color given in 

 varietal key below. Antennae less than half the length 

 of body, the joints subequal in length, bell-shaped, much 

 narrowed at base. Thorax longer than wide, distinctly 

 narrowed behind the middle; surface coarsely, roughly 

 and rather sparsely punctured. Elytra one-half wider 

 than thorax, coarsely punctate, tips rounded. Length 4- 

 7 mm. (Fig. 477.) 



KEY TO COLOE VAEIETIES OF O. ATEA. 



a. Elytra wholly blackish or piceous. 

 6. Thorax black or piceous. 



c. Legs wholly piceous. atea Ahr. 

 cc. Tibiae and femora brownish-yellow. tibialis Kirby. 



bl). Thorax more or less reddish. 



d. Thorax reddish with central dark spot. luctuosa Lac. 

 del. Thorax entirely reddish-yellow. hepatica Say, 



aa. Elytra more or less brownish-yellow. 

 e. Elytra with stripes. 



/. Piceous, thorax reddish-yellow ; elytra each with one yellow stripe 

 on disk. vittata Say. 



//. Dull yellow ; elytra each with sutural line and stripe on side dark. 



teivittata Lac. 



ee. Elytra dark, with large humeral and apical yellow spot (Fig. 477.) 



CHiLDEENi Kirby. 



Fig. 477. X 4i 

 (After Wickham.) 



