124 The Rocky Mountain Locust 



Minnesota, Iowa, Kansas and Missouri, and has destroyed 

 about one per cent, of the eggs. 



The following letters refer to this species : 



The other day, as I was strolling through the fields, I stopped to 

 examine some eggs. I found the ground in spots quite full of white 

 grubs, worms or maggots, whatever they may be called. Many of 

 them were in the egg-pods, busy at work. I collected a few, and 

 sent to you in a small vial by mail for your examination. The 

 ground was high and dry where found. — [From S. D.Payne, Ka- 

 sota, Le Sueur County, Minn., Sept. 28, 1876. 



I think the Silky Mite has done good service in destroying eggs 

 in one or two counties, particularly Nobles. But we are getting, in 

 addition, continual newspaper reports of white grubs destroying the 

 eggs. I started out to see for myself, and have found a number, 

 which I send you. — [From A. Whitman, St. Paul, Minn., Sept. 7, 

 1876. 



This grub is found of various sizes as winter sets in, 

 and hibernates without change. It will doubtless be reared 

 to the perfect state the coming summer, and I give a more 

 detailed description herewith. 



Average length, 0. 50 inch. Body curved, glabrous, tapering pos- 

 teriorly, swollen anteriorly. Color opaque whitish, with translucent 

 yellowish mottlings, and some vinous marks at sutures, especially 

 along mecho-dorsum. Sutures deep. A lateral row of swellings. 

 Head small, flattened, dark-brown, in five pieces, consisting above 

 of a frontal ovoid piece, and two lateral pieces of somewhat similar 

 form, and each bearing near tip a minute, two-j ointed palpus ; be- 

 neath of two broad, sub-triangular jaws, having forward and lateral 

 motion, and each also bearing near the center, in a depression, a 

 two-jointed feeler. A spiracle each side in a fold between joints 

 2 and 3, and another on each side of the penultimate joint, 12. None 

 otherwise perceptible. 



Besides the three preceding species which were found 

 destroying the eggs in 1876, and which, from their being 

 generally found within the egg-pod, may be called parasitic, 

 though they are not strictly so, I have also found the 

 larvae of two species of Ground-beetles (Carabidce) attack- 

 ing said eggs. One pale species (Fig. 23), evidently be- 



