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EXPLANATION OF PLATES," 
PLATE I. 
Corn Bill Bugs. 
Fig. 1. The Clay-colored Bill Bug, Sphenophorus ochreus; mag¬ 
nified two and one third diameters. 
Fig. 2. Sphenophorus pertinaxj magnified three diameters. 
Fig. 3. Sphenophorus robustus; magnified three and one third 
diameters. 
Fig. 4. Sphenophorus cariosus; magnified four diameters. 
PLATE II. 
Corn Bill Bugs. 
Fig. 1. Sphenophorus sculptihs; magnified four diameters. 
Fig. 2. Sphenophorus scoparius; magnified three and one half 
diameters. 
Fig. 3. Sphenophorus melanocephalusj magnified three and two 
thirds diameters. 
Fig. 4. Sphenophorus placidus; magnified five diameters. 
PLATE III. 
Corn Bill Bugs. 
Fig. 1. Sphenophorus parvulus; magnified five and one third 
diameters. 
Fig. 2. Sphenophorus minimus; magnified six diameters. 
* All the drawings for these plates were made at the office, by Mr. A. M. Wester*gren. 
* 
