— 139 — 



and most of them were boring towards the head of the stalks. 

 Several larvae had just begiui to tunnel the stalk and had not yet 

 perforated a single joint. 



On the 9th of Jul}' the wheat was ready to harvest. At this 

 time the stalks from another square yard were examined ; and 

 the results are shown in Table II. It will be seen that a very 

 marked change had taken i)hice in the ten days intervening be- 

 tween this time and the previous examination. In each case every 

 joint above the larva had 1jeen tunnelled ; with one exception the 

 larvae had started downward ; and sixteen of the twenty-one lar- 

 vae had penetrated the lower joint Had the wheat been cut with 

 a reaper that day only five of the larvae would have been removed 

 with the straw. The average length of the larvae was 11 mm. In 

 only two cases had the larvae begun to make the circular cut near 

 the ground. 



The wheat was left standing in a portion of the field and 

 examinations were made on the 13th, 15th, 17th and 19th of 

 Jtilv. 



On the i3Lh, nineteen infested stalks were found in one square 

 yard of the field. In these onl}' one larva was above the second 

 joint; five were at the first joint ; and thirteen were at the root. 

 All were below the reach of the reaper, as the one above the .sec- 

 ond joint was only two inches from the ground ; in fact it was 

 making its cocoon at this point. Ten of the specimens had made 

 the circular cut ; and three, had spun their cocoons. 



The results of the observations of July 15th are indicated in 

 Table III. Twenty-five of the thirty-three specimens had made 

 the circular cut, and thirteen had spun their cocoons. One speci- 

 men, the sixth from the left in the table, had made its cocoon 

 above the second joint, eight inches from the ground. Another 

 specimen was at the top of its burrow. These two were all that 

 were not below the reach of the reaper ; the only other specimen 

 above the first joint being only one and one-half inches from the 

 ground. 



The .square yard of wheat examined July 17th contained fifteen 

 infested straws. All but two of the larvae were at the surface of 

 the ground ; of these, one was five inches from the ground, above 

 the first joint ; and the other, six inches from the ground, and 

 above the second joint. 



