11 OS 



FAMILY MM. OHKYSO.MKLID.K. 



KEY TO INDIANA GENERA OF SAC, KIM. 



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



or tubercle; front coxa 1 not prominent, separated. III. ORSODACNA. 



mi. Thorax with a tubercle or annulate at the sides: front cox;e prominent, 



contiguous. 



1>. Eyes emarginate : thorax with a large, distinct tubercle on sides; 

 front coxal cavities closed: claws toothed. IV. ZEUGOPHORA. 



7>/>. Eyes entire: thorax annulate or toothed at sides; front coxal cavi- 

 ties open ; claws cleft. V. SYNETA. 



III. ORSODACNA Lat. 1802. (Gr., "bud -i 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 pic-eons to those almost 

 wholly pale brownish-yellow. 



;_'041 (CViOi. ( )i;soi)A( \A ATRA Ahrens. Nov. Act. Ilalens. 



I. IS 10. 4C. 



p]longate, rather slender, subconvex. Color given in 

 varietal key below. Antemioi less than half the length 

 of body, the joints suboqual 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. ( P'ig. 477.) 



KEY TO COLOR VARIETIES OK O. ATRA. 



Fig. 477. X 

 i \fii i Wickliani. ) 



ATRA Ahr. 

 TIHIALIS Kirby. 



LFCTUOSA Lac. 

 IIEPATICA Say, 



<i. Elytra wholly blackish or piceous. 

 1>. Thorax black or ]iceous. 

 c. Legs wholly piceous. 

 cc. Tibi.-e and femora lirownish-yellow. 

 bl). Thorax more or less reddish. 



tj. Thorax reddish with central dark spot. 

 <]<!. Thorax entirely reddish-yellow. 

 mi. Elytra more or less brownish-yellow, 

 r. Elytra with stripe.-. 



/. I'iceous, thorax reddish-yellow: elytra each with one yellow stripe 



on disk. \ rn ATA Say. 



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



TRIVITTATA LaC. 



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



cnii.itRENi Kirby. 



