. The horse-radish flea-beetle : its life history and distribution . nedsutural stripe, widest at the mid-dle and constricted at each endand extending from the base ofthe thorax to the apex of theelytra, where it joins the lateralline. The frons or front is veryfinely, and the prothorax andelytra densely, punctate. Asensitive pore from which pro-ceeds a seta is located on thelateral margin, which is behindthe anterior angle. In the malethe fourth antennal joint isslightly thickened and longerthan the fifth. In the female thefourth and fifth joints are equal. The average length is from 3to
. The horse-radish flea-beetle : its life history and distribution . nedsutural stripe, widest at the mid-dle and constricted at each endand extending from the base ofthe thorax to the apex of theelytra, where it joins the lateralline. The frons or front is veryfinely, and the prothorax andelytra densely, punctate. Asensitive pore from which pro-ceeds a seta is located on thelateral margin, which is behindthe anterior angle. In the malethe fourth antennal joint isslightly thickened and longerthan the fifth. In the female thefourth and fifth joints are equal. The average length is from 3to mm., but individuals havebeen observed where there is a variation of from mm. to a variation in width of mm. to mm. The following synonymy is recognized:Phyllotreta armoraciae (Koch). Haltica armoraciae Koch, Entom. Hefte. v. 2, p. 75, vittata Steph., Mandibulata. p. 292. 1831. The species is also treated systematically by Illiger, Duftschmidt,Gyllhenhal, Schilling, Kedtenbacher, Seidlitz, Foudras, Allard, Lees-bers. and Fig. 2.—Work of the horse-radish flea-beetle in leaf petioles of horse-radish.(Original.)horseradishfleab535chit
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