EEPOET OF THE ENTOMOLOGIST. 297 



and cat away tlie whole side and internal parts of tlie thorax, sometimes 

 also devoiirinf; 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. 



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

 p;irt of June, but did not succeed in obtaining any eggs, although I fre- 

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

 into the loose sand in the grain fields; after she had withdrawn her 

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

 where her abdomen had been thrust into the sand, but UQver 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, when I discovered her in the act of depositing 

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

 I came upon her unawares aud 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 I believe that no female lowust will deposit her 

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



OXnER SPECIES OF LOCUSTS. 



I captured eighteen different species of locusts in the San Joaquin 

 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 : 



Psoloessa texana Scudcler 1 



Hesperotettix viridis Thomas 4 



Conozoa ^caUula Scudder 6 



Camnula pellucida Scudder 8 



Aeridium shoshone Thomas 10 



Dissosteira venusta Stal 10 



Trimerotropia vinctdata Scudder 20 



Trimerotropis sp. ? 40 



Trimerotropis sp.T 50 



Melanoplus probable var. of devastator r>0 



Faroxtja near ailantica 50 



Trimerotropis sp. ? 75 



Dissosteira spurcata Saussure 100 



Caloplfnns differentialis Thomas 750 



Melanoplus einereus Scudder 1, 000 



Trimirolropis pseudofasciata Scudder ^ 1,000 



Afelanoplus devastator Scudder 20, OCO 



mJTJIlY COISOnTTED EY THE LOCUSTS. 



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

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

 the trees aud 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 



