11 



and eat away the whole side and internal parts of the thorax, sometimes 

 also devouring the greater part of the abdomen. This cannibalistic 

 habit seems to be indulged in by all the different species of locusts that 

 inhabit this valley. 



1 saw several pairs of Yellow Locusts united in coition in the latter 

 part of June, but did not succeed in obtaining any eggs, although I fre- 

 quently saw a female that had her abdomen sunken its whole length 

 into the loose sand in the grain fields; after she had withdrawn her 

 abdomen and walked away, 1 carefully dug up the earth in the place 

 where her abdomen had been thrust into the sand, but uev-er succeeded 

 in obtaining the eggs. As the situation chosen by these females was 

 in the open fields where it was impossible to watch their movements 

 unobserved by them, it is quite likely that my presence frightened or 

 otherwise disturbed them to such an extent that they would not deposit 

 their eggs so long as I was within view of them. So long as I remained 

 hidden from view, the female Differential Locust would continue deposit- 

 ing her eggs, that is, wheii I discovered her in the act of depositing 

 eggs some distance off, and my presence was unknown to her; but, when 

 I came upon her unawares and she saw me, it mattered not how quickly 

 and carefully I withdrew myself from her sight, she always refused to 

 deposit any eggs, after a certain time withdrawing her abdomen and 

 walking away. Hence 1 believe that no female locust will deposit her 

 eggs when she is aware of the presence of any person. 



OTHER SPECIES OF LOCUSTS. 



I captured eighteen different species of locusts in the San Joaquiii 

 Valley during the two months that I remained in that valley. In order 

 to show the comparative abundance of each of these species, I sub- 

 join herewith a list of those determined, with numbers attached show- 

 ing the numbers in which the locusts of each species appeared as com- 

 pared with those of any of the other species. Thus, the first species is 

 represented by the number 1 and the second species by the number 4, 

 indicating that there were four specimens of the latter species to every 

 one of the former, and so on throughout the list: 



Pxoloessa tejcana Scudder 



Hesperotetlix viridis Thomas 4 



Cotiozoa wallula Scudder 6 



Camnula pellHcida S<mdder & 



Acridium shoshom Thomas 10 



DixHoxleira ren nst<i St:ll 10 



Trimcrotrojtix rinciildta Scudder 5iO 



Trimerotropix sp. ? 40 



Trimerotropis sp. '{ 50 



Melanoplus probable var. of devastator - r >0 



Paroxya near atlantica 50 



Trimerotropi* up. I 75 



Diswsteira upnrcala Saussure 100 



Caloptenns difftrentittlis Thomas 750 



Melano^lu-H cinereus Scudder 1, 000 



Trinitrotrofjix pseudofazciata Scndder 1 , 000 



Melanoplus devastator Scudder ^0, U< 



INJURY COMMITTED BY THE LOCUSTS. 



It is very difficult to give any idea of the injury committed by the 

 locusts in the San Joaquin Valley the present season. A majority of 

 the trees and grape-vines that had been defoliated by them, put forth 

 a new growth of leaves in the course of three or four weeks from the 



