

ILLUSTRATIONS 



PLATES. 



Page. 



Plate I. The timothy stem-borer ( Mordellistena ustulata): Larvae and pupa 



in stems 8 



II. Fig. 1. — Corn plant injured by the adult of the maize billbug 



(Sphenophorus maidis) ; afterwards attacked by the larva. Fig. 2. — 



Corn plant showing on stalk the effects of feeding by adult maize 



billbugs; effects of feeding by larvae on roots. Fig. 3. — Corn plant, 



much distorted, showing suckers; final effects of feeding of adult 



maize billbug 18 



III. Corn plants showing effects of feeding of adult maize billbugs in the 



field ; plant at left not attacked ; the two at right attacked by larva? . 18 



IV. Ravages of the chinch bug (Blissus leucopterus) . Fig. 1. — Corn plant 

 killed by chinch bug. Fig. 2. — Chinch-bug ravages in cornfield in 

 southern Kansas, 1910. Fig. 3. — Cornfield adjoining wheat field 

 from which chinch bugs migrated in immense numbers at harvest 



time 24 



V. Hibernation of the chinch bug. Fig. 1. — Pile of sorghum canes in 

 which no hibernating chinch bugs could be found. Fig. 2. — 

 Waste land along stream in foreground, sedge-grass meadow in 

 background; chinch bugs found hibernating in both. Fig. 3. — 

 Clumps of red sedge grass (Andropogon scoparius) in which over 

 6,000 chinch bugs were found hibernating during winter of 1 909-10. 36 



VI. The portion of the Shannonhouse cornfield, Hertford, N. C, on 

 which corn was grown in 1910, totally destroyed by the "curlew 

 bug, ' ' Sphenophorus callosus, in 1911 60 



VII. The portion of the Shannonhouse cornfield that was devoted to 

 cotton in 1910; planted to corn in 1.911 and uninjured by the "cur- 

 lew bug " 60 



VIII. The dividing line in the Shannonhouse cornfield in 1911 between 

 the portion (to the left of the man standing in the center) devoted 

 to cotton in 1910 and the portion (to the right) where corn was 

 grown in 1910 60 



IX. Fig. 1. — View of cornfield near Appleton, Tenn., showing damage by 

 the "curlew bug." Fig. 2. — Corn plants, showing normal plant 



and those damaged by the "curlew bug " 68 



X. Experimental plats used in investigations of the legume pod moth 



during the season of 1911 100 



XI. The alfalfa looper and its parasites. Fig. 1. — Cocoon cluster of 

 Apanteles hyslopi. Fig. 2. — Cocoon of alfalfa looper (Autographa 

 gamma calif ornica) . Fig. 3. — Larva of alfalfa looper with cocoon of 

 Miei'oplitis alaskensis. Fig. 4. — Pupa of alfalfa looper. Fig. 5. — 

 Adult alfalfa looper. Fig. 6. — Adult alfalfa looper at rest 112 



IX 



