De eee ee ee et ee 
THE HORSE-RADISH FLEA-BEETLE. 5 
|. third row four; at the ends of the third row, a little anterior, are the 
slightly elevated chitinous pleural plates, bearing three sete each. 
The anal plate approximates a rectangle in outline with the sides 
converging toward the posterior end and corners rounded. The 
whole surface except the chitinous plates is covered with minute 
granulations. 
| The length just prior to pupation is 4.8 mm., the width 0.8 mm. 
THE PUPA. 
The pupa (fig. 5) is white and about the same size as the mature 
beetle. The antenne are placed along the dorsal margin of the 
wings and extend around on the ventral side about one-half way to 
the middle of the body. Between the wings, which extend down to 
the fourth abdominal segment, is a narrow space 
in which the tarsi of the three pairs of legs are 
placed. The femora and tibiz of the anterior 
pairs of legs are parallel and extend transversely 
-across the body over the wings, while these parts 
of the posterior pair of legs extend obliquely and 
are under the wings, the tips being just visible. 
Two forceps-like chitinous processes occur at the 
apex or tip of the last abdominal segment; a stout 
seta on the tip of each femur, and a number of setz 
at various points on the head and body. Fic. 5.—The horse- 
radish  flea-beetle: 
DISTRIBUTION IN NORTH AMERICA. Pupa, ventral view. 
The following is a list of localities in which career eee 
the horse-radish flea-beetle 1s known to occur in 
North America. (Fig. 6.) This list is given in approximate order 
of the first noted appearance of the insect, with the name of the col-_ 
lector in each case: 
Chicago, Ill., 1893 (Chittenden). 
Guttenberg, Iowa, 1894 (Hugo Soltau). 
_ Okauchee, Wis., 1896 (Dr. E. G. Love). 
Dane County, Wis., 1900 (Dr. Wm. S. Marshall). 
Bloomington, McLean County, 11, 1900 (Wolcott). 
Glencoe, Ill., 1908 (J. EH. Fehd). 
Milwaukee County, Wis., 1908 (Dr. S. Graenicher). 
Whitewater, Wis., 1909 (Univ. Wis. Coll.). 
Westmount, Quebec, 1910 (A. F. Winn). 
Lake County, Ind., 1910 (Wolcott), (Blatchley). 
Shermerville, Ill., 1912 (Retzinger). 
Chester, N. J., 1913 (H. O, Marsh). 
Green Bay, Wis., 1914 (J. G. Sanders), 1915 (N. F. Howard). 
Highland Park, Mich., 1915 (1 .Miller). 
Omaha, Nebr., 1915 (Ehlers). 
Potsdam, N. Y., 1915 (Chas. Dury). 
Ashtabula County, Ohio, 1915 (Robt. Sim). 
Madison, Wis., 1916 (N. F. Howard). 
