REPORT OF THE ENTOMOLOGIST 119 



Cocoons with, male moths emerged 22 



Cocoons with female moths emerged 10 



Cocoons with contents placed in vials 92 



150 

 From the contents of the 92 cocoons placed in vials moths emerged as 

 follows: 



Males. Females. 



July 15 1 . 3 



" 16 5 7 



" 17 5 3 



" 18 3 4 



" 20 5 4 



" 21 2 3^ 



" 22 1 



" 23 2 



" 25 1 



25 24 



Deducting the 49 cocoons from which moths emerged there were left 

 44 cocoons. Although nothing emerged from some of them, the following 

 parasites issued: 



Pimpla sp. Dibrachys bouclieanus. 



July 15 2 July 24 6 



" 16 2 " 28 15 



" 17 2 " 28 50 



" 20 7 



" 28 1 



14 71 



The Walnnt Caterpillar — (Datana angusli Grote & Robinson) 

 In the report for last year the yellow-necked apple-tree caterpillar 

 (Datana mlnistra) was discussed in some detail. Attention is here drawn 

 to a very similar and closely related species which, in company with the 

 preceding, occurs very commonly upon the walnut and frequenty in 

 such numbers as to largely or entirely defoliate the trees as is shown 

 on Plate 15. This species may be told from ministra by the fact that 

 the segment just behind the head is entirely black instead of entirely 

 yellow. It is also a less general feeder occurring almost entirely on 

 walnut and hickory. Its life-history is essentially like that described 

 for Datana ministra including the gregarious molting habit (Plate 16) 

 and the means of controlling it are identical. 



The Cottonwood Leaf-Beetle — (Lina scriptji fabricius). 

 The cottonwoods, poplars, and willows of Nebraska and other states 

 immediatly to the north and south have for many years past been 

 seriously injured by this insect. The species is, perhaps, primarily an 



