366 JOSEPH HALL BODINE. 



drawing the blood up into the vessel. Individual adult grass- 

 hoppers can be punctured at least two to three times daily 

 without any apparent injury. 



TABLE 4. 



Romalca microptera. 1 



Average 



Date. Stage. pH of Blood. 



Feb. 19, 1926 Nymphs 6.83 



26, 1926 Nymphs 6.88 



Mar. 5, 1926 Nymphs 6.72 



12, 1926 Nymphs 6.74 



19. 1926 Nymphs 6.84 



26, 1926 Nymphs 6.79 



Apr. 9, 1926 Nymphs 6.66 



16, 1926 Nymphs 6.87 



23, 1926 Nymphs 6.56 



28, 1926 Nymphs 7.10 (?) 



30, 1926 Adults 6.82 



May 7, 1926 Adults 6.88 



14. 1926 Adults 6.84 



21, 1926 Adults 6.68 



28, 1926 Adults 6.46 



June i, 1926 Adults 6.77 



2, 1926 Adults 6.67 



3, 1926 Adults 6.55 



4, 1926 Adults 6.53 



5, 1926 Adults 6.72 



7, 1926 Adults 6.50 



9, 1926 Adults 6.59 



ii, 1926 Adults 6.82 



15, 1926 Adults 6.87 



Average 6.73 



Range 6.4-6.8 



Explanation of Table 4. 



Detailed average pH values for grasshoppers from day of hatching until death. 

 Data for each day represents average readings for from 5 to 20 individuals. All 

 animals laboratory raised and fed lettuce. Average and range of pH given for all 

 individuals tested. 



All laboratory animals were hatched from eggs laid in the 

 laboratory and were fed lettuce. Animals were also collected 



1 The author is indebted to Dr. H. Fry for his generosity in supplying some of the 

 eggs used in these experiments. These eggs were from a cross between Romalea 

 microplcra and Romalea microptera, variety macri. No differences in pH of the 

 blood from this cross and the R. microplera were noted. 



