EXPLANATION OF PLATES,* 
PLATE A. 
The Corn Leaf Louse, Aphis maidis , Pitch. 
Fig-, l. Winged viviparous female. 
Fig. 2. Wingless viviparous female. 
Fig. 3. Pupa. 
PLATE B. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
The Corn Root Louse. Aphis maidi - radicis , 
Winged viviparous female. 
Wingless viviparous female. 
Wingless oviparous female. 
Pupa. 
Forbes. 
PLATE C. 
The Chain Louse, tSiphonopliora arena ?,. Fabr. 
Fig. 1. Wingless viviparous female. 
Fig. 2. Winged viviparous female. 
Fig. 3. Pupa. 
PLATE I. 
Pig. 1. Larva of Scolytus rugulosus; enlarged twenty-two diameters. 
Fig. 2. Pupa, side view: enlarged twenty diameters. 
Fig. 3. Beetle: enlarged twenty diameters. 
Fig. 4. Pupa, dorsal view: enlarged twenty diameters. 
Pig. 5. C/rifopachyr colon, Linn., parasite of larva: enlarged eight di¬ 
ameters. 
by Mr. A. M. Westergren, with 
.. * r ^& e drawings for these plates were made at the office 
the following exceptions: 
Fig. 5, PL I. is from an unpublished cut loaned by Dr. C. V. Riley: Fig. 9 PI I is from 
ftatzeburg; Fig.4 and 5, Pl.Ill.,are taken from previous reports of the office; and Fig.;{ 
PI. IV., is from Dr. Ritey's Missouri Reports. ’ * * 
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