1220 



FAMII.V LIII. — CIIKVSOMELID.i;. 



(1. Snrfaf-e shiuiug, the imuctuation never very coarse; elytra each 



witli a paler merlian stripe. 2260. t^niata. 



f]il. Surface subopaque, the punctuation coarse, close anrl deep; elytra 



MARGINATJS. 



2257 



without a paler merlian stripe. 

 (6995). Systena htdsonias Forst. 



Fig. 541. X 10. (After Forbes.) 



2261. 

 Nov. Sp. Ins., 1771, 26. 



Elongate, subdepressed. Pic- 

 eous blaclc, shining ; antennje with 

 joints 3, 4 and 5 dull yellow, the 

 others more or less piceous; legs 

 black. Thorax about one-third 

 wider tlian long, sides feebly 

 curved, front angles obliquely 

 truncate; surface finely aluta- 

 ceous, indistinctly punctate, mi- 

 nutely wrinkled. Elytra wider at 

 base than thorax; disk coarsely and 

 closely punctate, somewhat rugose. 

 Length 4-4.5 mm. (Fig. 541.) 



Throughout the State ; 

 frequent in the southern, 

 scarce in the northern coun- 

 ties. May 21-August 20. Oc- 

 curs on the greater ragweed, 



Amhrosia trifida L. ; also on elder and other weeds. 



*2258 (6996). Systena frontalis Fabr 



Resembles hudsonius very 

 closely. Usually a little 

 broader and less shining, the 

 liead reddish or reddish-yel- 

 low ; antennie and legs mostly 

 pale. Thorax more distinctly 

 and elytra less coarsely punc- 

 tate. Males in both species 

 with the last ventral segment 

 notched each side, the middle 

 lobe with a deeply impressed 

 triangular median line. Lengtli 

 3.5-4.5 mm, (Fig, 542.) 



Throughout the State; 



less common than hudso- 



}iias. Hibernates beneath 



liark of soft maple and 



mullein leaves. February 



14-September 22. Occurs 



most freciuently on smart- 

 weed {Folijfiouum), the 



greater ragweed and pigweed (Clx nopodnun). 



Syst. Eleut, I, 1801, 300. 



Fig. 542. 



10. (After Forbes.) 



