THE HORSE-RADISH FLEA-BEETLE. 5 



third row four ; at the ends of the third row, a little anterior, are the 

 slightly elevated ehitinous pleural plates, bearing three setae each. 



The anal plate approximates a rectangle in outline Math the sides 

 converging toward the posterior end and corners rounded. The 

 whole surface except the ehitinous 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 antennae 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 tibiae 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 ehitinous 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 setae 

 at various points on the head and body. fig. 5.— The horse- 



DISTRIBUTION IN NORTH AMERICA. ^p^ventrai^ew! 



The following is a list of localities in which nan^ "^ 



the horse-radish flea-beetle is 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, 111., 1893 (Chittenden). 



Guttenberg, Iowa, 1894 (Hugo Soltau). 



Okauchee, Wis., 1896 (Dr. E. G. Love). 



Dane County, Wis., 1900 (Dr. Win. S. Marshall). 



Bloomington, McLean County, 111., 1900 (Wolcott). 



Glencoe, 111., 1908 (J. E. 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, 111., 1912 (Retzinger). 



Chester, N. J., 1913 (H. O. Marsh). 



Green Bay, Wis., 1914 (J. G. Sanders), 1915 (N. F. Howard). 



Highland Park, Mich., 1915 (L .Miller). 



Omaha, Nebr., 1915 (Ehlers). 



Potsdam, N. Y., 1915 (Chas. Dury). 



Ashtabula County, Ohio, 1915 (Robt. Sim). 



Madison, Wis., 1916 (N. F. Howard). 



