1006 I. M. Hawiry 
; | : 
Fic. 94. BEAN AND CLOVER LEAVES INJURED BY THE RED-HEADED FLEA-BEETLE 
Japanese honeysuckle, weigela, aster, chrysanthemum, marsh mallow, 
rose mallow, smartweed, pigweed, lamb’s-quarters, and ragweed. In 
addition to these hosts, the writer has found the species on goldenrod, 
daisy, broad-leafed plantain (Plantago major L. ), black bindweed (Poly- 
gonum convolvulus L.), common burdock (Arctiwm minus Bernh.), heal-all 
(Prunella vulgaris L.), lady’s-thumb (Polygonum Persicaria L.), wild 
lettuce (Lactuca canadensis L.), and beggar-ticks (Bidens frondosa L.). 
Where S. frontalis has been found in large numbers, some of its weed 
hosts also have been abundant. Ragweed, lamb’s-quarters, and beggar- 
ticks seem to be the most preferred. 
DESCRIPTION OF STAGES 
The egg 
The egg of Systena frontalis is elliptical, slightly more rounded at one 
end, and is pale yellow in color (Plate LX XI, 6). The surface is rough- 
ened. Under high power these roughened areas are seen to be irregular, 
and they are made by the union of shallow grooves which form the 
borders of differently shaped polygons. The length is from 0.7 to 0.85 
millimeter. 
